Hardinge HLV-H turning lathe machine

MODEL HLV-H HARDINGE HIGH SPEED TOOL ROOM LATHE
HARDINGE \ DOVETAIL BED / SOLID HARDENED AND GROUND STEEL

Aп example of modern turning with work held in a collet. With the Hardinge
HLV-H Lathe the collets seat directly in the spíndle for maximum accuracy and rígídity. For fast, accurate, easy chuckıng, use collets to hold your work avaìlable іп round; hexagon and square fractíonal sizes from collet stocks in Feltham, Middx., and Advance Motor Supplíes Depots ín Manchester, Glasgow, Bristol and Derby.
2
The set-up illustrated above ıs given to show the range of the Hardinge HLV-H Lathe. Compare it to the íllustration on page 4.
Precìsion taper turning is easy when done on the Hardinge HLV-H Lathe equipped with a taper turning attachment.

The smooth, powerful endless V-beİt drive of the Hardínge HLV-H Lathe, coupled with the high speeds obtained, make sma11 diametεr work easy and effıcient.
4
Aп example of the correct method of holding aі ı ínstrument part for accurate, high-speed machining by holding the part in a standard step chuck. ee pages 50, 51, 52 and 53 for fu11 riformation on step chucks and closers.
5
The set-up illustrated above shows the use of a three-jaw chuck to hold a forged steel part. Jaw chucks are shown oп page 48.
6
CONTENTS
INSTALLATION INSTRUCTIONS
Remove crating, but do not remove machine from skíd. Move machíne to the location in your plant where it is to be used and then remove machine from skid. See instructions below for lifting machine from skid.
LIFTING MACHINE. Remove the three bolts which hold the machíne to the shipping skids. There are two bolts at the extreme left-hand end of the pedestal and one at ríght-hand end.
The machine may be removed from the skid by either a crane or fork-líft truck. Lifting wíth a crane, the rope or cab1e sling should be arranged as shown on thís page. NEVER LIFT MACHINE WITH ROPE OR CABLE AROUND SPINDLE, BED OR TAILSTOCK.
The rope or cab1e must be capa6le of withstanding a weíght of 2,000 .
When using a lift truck, adjust forks to go in between top planks of skíd and bottom of pedestal base. Líft machine slowly, checking to see that the correct Ьalaпce is obcained. Use caution, as machíne has somewhat more weight at the front and it is more easily típped using the líft truck method than the crane and sliııg method.
After skíd has been removed place machíne dírectly on locatíon where ít is to be used.
MACHINE FOUNDATION. The Hardínge HLV-H Precísion Lathe is designed to operate without the need of specíal foundatíons. A substantial wood or concrete floor is satisfactory. It must, however, be fairly flat and have suffıcíent strength to support machíne properly. 
Do not locate machíne near other equípment that causes vibration whích will transmít to this machine, as poor work fınísh will result.

INSTALLATION INSTRUCTIONS (Continued)

Leveling the Machine
The Hardinge HLV-H Precision Lathe features a three-point bearing arrangement between the bed and pedestal base, making precise leveling unnecessary. Instead, ensure the machine is reasonably level so that coolant can properly drain back into the sump from both ends of the pan. An adjustable foot is located at the back right-hand corner of the pedestal base to compensate for uneven floor surfaces. To adjust, loosen the socket set screw and use a pin wrench to raise or lower the foot until all four feet rest firmly on the floor. Tighten the socket set screw to lock the setting. If the adjustable foot does not provide adequate leveling, use shims under the pedestal feet as needed.

Cleaning the Machine
Use only a cloth or brush to clean this precision machine. DO NOT USE COMPRESSED AIR FOR CLEANING. Compressed air can damage the machine's precision components by forcing dirt and particles past seals and into the slides and bearings, which can reduce the machine's precision life. This guideline also applies to daily cleaning after the machine is in operation.

After the machine has been positioned and leveled, remove any anti-rust shipping grease and dirt accumulated during transit with a high-quality grease solvent. Remove the wood shipping retainer block and any wire binding from the variable speed and countershaft pulley assembly. Using a socket wrench, remove and discard the shipping hold-down clamps located inside the motor compartment above the pulley assembly.

Remove all shíppíng grease from varíable speed verticat screw A , Figure 1, pulleys and brake drum, with cloth dampened with soıvent. Do not saturate belts with soivent. Lubricate nut at grease fıtting B and oil vertícaİ screw wíth light oil for fırst run in oп1y. Keep vertical screw lubricated by greasing at fitгing B using a good grade of grease. LUBRICATE ONCE A MONTH or oftener íf necessary. Add a few drops of líght oi1 to brake drum C . C1eaп motor compartmenc and tool storage compartment.
CONNECTIC NS
The machine is shipped completely wired and assembled. It is only necessary to run the electric power line to the top of the control panel, Figure 2, and attach the wires to the three terminals inside the isolator Switch shown at A , Fígure 2. Electric power feed for carriage is connected to main control panel and does not require a separate power 1ine. BEFORE CHECKING
ROTATION APPLY COLLET, W1TH ST OCK IN PLACE, TO HEADSTOĆK 5P NDLE AND TIGHTEN. Aiso check that colÍet cfoser latch A , Figure 11, page 22, is in closed position and spindle lock D , Figure 3, page 12, is in out or released position.
Make sure switch B , Figure 5, page 14, is set at FORWARD. JOG
SPINDLE 5LIGHTLY US1NG LEVER A , Figure 3, page 12.
ELECTRICAL CONNECTIONS Continued

Instructions for Correcting Rotation and Using Switches

Correcting Motor Rotation:
If the machine’s rotation is incorrect, first disconnect the power. Then, reverse any two incoming wires that connect to Isolating Switch A (see Figure 2).

If power is initially connected incorrectly and the speed-changing mechanism is engaged, the drive will move to its highest or lowest position and activate a safety limit switch. To disengage from the safety limit switch, follow these steps:

Press the STOP button (refer to Figure 5, page 14).

Manually turn the variable speed operating screw A (refer to Figure 1, page 9) by hand for three full turns. This will lift or lower the driving unit, moving it away from the safety limit switch.

Brake Release Switch:
Switch A (Figure 4, page 13) is the brake release switch. For regular operation, set this switch to the BRAKE position. In this setting, the brake will automatically engage or release whenever the machine is started or stopped using Control Lever A (see Figure 3, page 12).

Coolant Pump Switch:

Switch F (Figure 4, page 13) controls the coolant pump. Set it to OFF when coolant is not needed.

When Coolant Pump Switch B is set to ON, the coolant pump will run continuously.

When Coolant Pump Switch B is set to AUTO, coolant will flow only while the machine is operating.

Electrical Components Overview:

Contactor B: This is the main line contactor that provides low voltage protection.

Contactor C: This is a safety interlock for the spindle stop pin.

Transformer D: Supplies 230 volts AC for control buttons A and C (see Figure 5, page 14

Fuse E provídes protection for carríage power feed motor and secondary protection for transformer.
Main control swítch F operates main drive motor and gives selectíon of , ON-OFF HIGH-LOW and BRAKE.
Switch G ís safety ínterlock and cuts off power feeds when machine spíndle is stopped.
Contactor H , Figure 2, is FORWARD-REVERSE of main drive motor,
Contactor J controls brake.
Thermal overload reay K is for coolant pump motor.
Thermal overload relay L ís for main dríve motor.
Thermal overload relay M is for speed change motor.
Contactor N controls coolant pump.
Contactor O controls varíable speed motor for goíng FASTER .
Contactor P controls variable speed motor for going SLOWER .
Connectíon at 6Y ís for the START button at R the STOP
button at S the REVERSE swítch and at T the pilot light.
Disconnect swítch or isolator swítch A ís operated by lever D , Figure 5, page 14, and must Ьe returned to OFF posítíon to open swítch panel.

OPERATING INSTRUCTIONS SPINDLE CONTROL LEVER Fígure 3
CONTROL LEVER A , Figure 3, is the main control lever for che spindfe. When moved to the extreme left the brake is released and the main dríve motor ís on the LOW side. When moved to extreme right the brake is released and the main motor is on the H1GH síde.
The centre or STOP positíon stops the motor and applies the brake.
Dírectíon Control Lever For Carriage Fígure 3
Control lever B , Fígure 3, reverses directíon of carríage for threadíng only. Always place this lever in centre positíon before starting machine.
SEE PAGE 30 FOR COMPLETE 1NSTRUCTIONS ON THREADING
Disconnect For Gearbox Fígure 3
Knob C is used to connect or disconnect the gear box from the headstock
spind1e by means of a slíding gear. ALWAYS SHUT OFF MACHINE
BEFORE ENGAGING OR DISENGAGING. Turn knob clockwise to
FEED positíon to disconnect gear box. See page 30 for instructions on
positíoníng for threading.

Spíndle Lock Pin Figure 3
The spindIe lock pin D , Figure 3, is located at the front of the head stock. The pin is held in the OUT or released position by a spring and ball plunger. The spíndle lock pin is
used to hold the headstock spindle statíonary when applying or removíing spindle nose attachments, adjusting collet closer, tightening draw spindle or when applyıng and removíng work from fıxtures. To engage lock pin turn spindle by hand and hold lock pin in until ít engages in one of the notches of the spindle aѕѕembly. RELEASE BRAKE by setting switch A , Figure 4, page 13, to OFF posítíon. The spindle lock pin ís interlocked electrícally wíth the main drive motor and must be withdrawn before machíne will
start.
12 Figure 3
Figure 4
To Turn Spindle By Hand
FREE SPINDLE. To obtain a free spindie for easy turning of the spíndle by hand, place operatíng lever A , Figure 3, in STOP Position and turn brake switch A , Figure 4, to OFF position. 
To Start and Stop Spindle Fígure 3
Pull out spindle lock pin D , Figure 3, page 12. Lever A and lever
Fígure 3, must be in centre posítion. P1ace knob C in FEED posítion.
Set switch B , Figure 5, page 14, at FORWARD . Put collet in spindle wíth correct size stock in place or use headstock centre and tíghten wíth collet closer. Press START button A on front of control panel, Fígure 5, page 14, which energizes panel and is índicated 6y pilot light E , Figure 5, page 14. The machíne is now ready to start. Use main control lever A , Figure 3, to start and stop the spindle. Move to extreme left to start spíndle on LOW side of motor. Move to extreme right to start spíndle on HIGH side of motor. Centre positíon shuts off the main motor and applíes the brake.
To make the spind1e go FASTER push the top button as shown in Fígure 4, above, untíl the speed indicator shows desired speed and then remove fınger from button. To make spindle go SLOWER push lower button as shown in Fígure 4, above.
The speed indicator moves up or down to indicate in the left column speed fıgures for the LOW side of the motor and in the ríght column for the HIGH side of the motor.

Control Pane1 Fígure 5
START button A , Fígure 5,
controls main contactor to energize switch control panel. BEFORE PUSHING START
button ѕee instruction oп page 13, to START AND STOP SPINDLE . Push STOP button C
when fıníshed using lathe.
Swítch B , Fígure 5, ís FORWARD-REVERSE for spindie.
Switch A , Figure 4, releases brake when set at OFF to give
free spindle .  
When set at BRAKE the brake automaticaily goes ON or OFF when using control lever A , Figure 3, page 12. Coolant switch B , Figure 4, page 13, should be at OFF unless using coolant supply.
Spíndle Driving Unit Figure 6
The drívíng unít provídes infınítely variable spíndle speeds from 125 to 3,000 г by push button control as íllustrated on page 13. Speed changes can be made while the tool ís actually under cut wíth the operator watching the chíp and tool to obtaín fastest chip removal and longest tool lífe.
Push button controlled motor A , Fígure 6, ís a reversíng motor and actuates speed changing screw B whích in turn raíses or lowers frame C.
Frame C caггіeѕ the countershaft pulley assembly D.
Countershaft PuIiey Assembly Figure 6
The entire countershaft pulley assembly including the shaft F , Figure 6, is free to float from side to síde. The centre sheave of the assembly is independent of the two outer sectíons which are in a fixed position on the shaft.
The pulley frame C , Fígure 6, is hinged at poínt E and when the front end ís raísed or lowered, belt tensíon will move the centre sheave sideways and change the ratio between the driven and the driving pulley which changes the headstock spindle speed.
The variable speed pulfeys have a built-in lubrícatıng system. Run the machíne, each day, through a complete cycle from 125 to 3,000 to lubrícate the pulleys and keep them operating effıciently.
Figure 6
Belt Adjustment Fígure 6
By raising or loweríng the motor plate, proper belt tension can be obtained.
Due to the construction of the drivíng unit the tension of the motor belt and spindle belt are automatically equalised. BELT TENSION SHOULD BE CHECKED ONCE A WEEK. especially when the machine is new.
To check belt tension, fırst set brake switch to OFF . Start machine spindle shut off and allow to coast to a stop. THE BELTS SHOULD NOT BE STRETCHED, YETADJUSTED SO THERE IS NO LOOSENESS.
To tighten belts, loosen nut G , Figure 6, and turn set screw H clock-wíse. Make adjustment in ѕmall amounts and run machine between each setting to permìt belts to equalise .
IF BELTS SLIP WHEN ADJUSTED TO PROPER TENSION, THE MACHINE IS BEING OVERLOADED. Centrifugal force tends to tighten belts when running.
Belt Adjustrnent Continued
After proper setting, ock nur G. Figure 6, and reset brake switch to BRAKE .
Drive shaft bearings located at J , Figure 6, are precision ballbearíng type, grease packed and sealed and requir2 no further attention. Drive shaft F ,Figure 6, is coated with MOLYLUBE so it wi11 slide freely.
The belts and driving unit are protected from overtravel by a set of stops Figure 6. The two stops K are set at the factory and actuate electric limit switches and automatically shut off the speed changing mechanism when it reaches the low speed of 125 or the high speed of 3,000. The two stops L , Figure 6, are alѕo set at the factory and are positive mechanícal stops in case the electric limit switches fail NOTE: If the speed changing mechanism does not work, check instructions on pages 10 and 11.
Figure 7
The spindle driveshaft brake is desígned for rapid but gradual stoppíng of the precision headstock spindle. The brake is  in with the control lever A , page 12, and is released
when the machine is turned on and applied when the machine is turned off.
Figure 7
TO RELEASE BRAKE for a FREE SP1NDLE turn brake switch to OFF as shown on page 13. The brake drum D , Figure 7, is located directly on the main motor drive shafc. The brake is actuated by a solenoid located under cover A , Figure 8, page 17 and is accessible from rear of machine by removing motor ventilator screen.
The brake shoe insert C , Figure 7, is forc2d against the brake drunı by means of a powerful spring. The spring automatIcaIIy compensates for brake wear. However, after considerable use it may 6e necessary to adjust. 
To Adjust Brake Figure 7
With brake in released or OFF position, loosen set screw A , Fígure 7 and turn adjusting screw B to the right with a pin wrench until there is .003 to .005 clearance between the insert C and drum D.
Dríveshaft Brake Continued
After adjustment relock set screw A , Fígure 7
DO NOT ADJUSTE , Fígure 7, whích has been set at the factory to hold alígnment key for the brake shoe housíng.
DO NOT RUN BRAKE DRY. Add a few drops of light oil to the brake drum períodícally which will keep the brake insert pliable. If machine ís braked often 0іl daily. Braking time is from 2 to 3 seconds.
CAUTION: Do not allow brake insert to become worn enough to allow
insert housing F , Fígure 7, to score brake drum.
TO REPLACE BRAKE INSERT, loosen set screw A , Figure 7, and unscrew nut B , Fígure 7, and remove housing F , Figure 7. Knock out old insert. Trim off small end of new insert until it bottoms and is a snug fıt in tapered hole of housíng. When reassembling, line up keyway of housing with key before startíng adjusting nut B , Figure 7. Set clearance to .003 to .005 as explained before and relock set screw A , Figure 7. -
Maіп drive motor B , Fígure 8, and varíable speed motor C ,
Figure 8, have grease sealed ball bearingsand need no further attention.
Adjusting screws D and E ,
Figure 8, are set at the factory and are for alignment of the counter-shaft in relatíon to main drive motor and spindle headstock pulley.
TO REMOVE MOTOR BELT
1. Run countershaft carrier brackct to top position highest spindle speed setting .
2. Turn brake control selector swítch to
3. Remove nut and steel washer from motor plate hold down bolt and raise motor plate 2 to 3 and block.
4. Remove brake drum from motor shaft 6y taking out four lock screws and set screws. The four keyways n the pulley brake drum are numered. When removíng pulley note the keyway number that the motor shaft key is in so ít can be assembled in the same location.
5. Roll head belt off of countershaft pulley then slide countershaft pulley aѕѕembly to extreme ríght.
6. Pass head belt and motor belt around and off end of shaft.
7. Put new motor belt in place.
8. Replace head 6e1t on countershaft and reassemЫe. FOR PROPER BELT 
ADJUSTMENT REFER TO PAGE 15.
TO REMOVE HEADSTOCK BELT
1. Fo11ow ínstructíons How To Remove Motor Belt steps 1 through 5.
2. Pass head belt around and off end of shaft.
3. Remove swítch pullrod that goes through belt.
4. Remove collet closer, see page 23.
5. Remove handwheel snap ring and handwheel.
6. Remove handwheel spindle key, spríng spacer and washer.
7. Remove both back covers from gear box.
8. Remove snap ring in front of idler gear bearing.
9. Screw push screw in to remove gear, shaft and bearíng.
10. Remove lock screws in shifter yoke, unscrew shaft wíth ,= hex key
wrench in end of shaft and pu11 shaft part way out approx. 5 .
Figure A Figure B
11. Use swítch pull rod as hook and bring belt part way out opening and around end of spindle, aѕ shown in A above, and then out through [op opening in rear of gear box, as shown in Figure B above.
12. Tіe weíghted stríng around new belt and drop through opening for belt, to guíde ít down through gear box and pedestal. lnstal new belt as shown in Figure
A . Use switch pull rod to lift belt up on to spíndle pulley. 
13. Push shifter back in and screw in place. Lever must be in vertical posítíon.
14. Locate shífter yoke on shaft by líníng up screw holes.
15. Replace ídler gear, shaft, bearíng and snap ring. Line up gears as shown ín sketch at
right.
16. Replace head belt on countershaft and reassemble. FOR PROPER BELT ADJUSTMENT REFER TO PAGE 15.
FLOW TO APPL AND RĚMOVE SPINDLE NOSE TOOLING
Figures 9 and 10
The Hardinge Taper Nose spindle construction is time-proven for accuracy, durability and for fast, easy appiication and removal of spindle nose toolíng.
The precision ground slow taper holds and aligns all tooling. The pin in all headstock spindle nose tooling engages the bayonet slot A , to draw the attachment securely on the taper. Once securely drawn up, the spindie nose attachment is actually driven by the locking action of the tapered surface.

BEFORE APPLYING ANY 1 YEN OF TOOLING TO THE SPINDLE NOSE VIPE 
TO APPLY the drive plate for driving dog, for exampIe, align key
Figure 10, with bayonet slot and slide drive plate on spindle nose. When it is back as far as it wi11 go turn the drive plate clockwise to lock in place.
This is determined by the relation of the key D and spindIe reference line E. Fina1 tightening should be done with a standard pin type spanner wrench. Do not use hammer and punch.
TO REMOVE the drive plate, turn counterclockwise with spanner wrench to loosen. Continue to turn until key D ís in line with reference mark E , then remove from spindle by sliding to right off end of spindle.
IMPORTANT To obtain accurate results from precisíon spindle nose actachment always be sure the spindle nose and mating section in attachment
arc CLEAN ĹEFORE THEY ARE ASSEMBLED TOGETHER.
DO NOT REMOVE KEY D TO REMOVE SPINDLE NOSE TOOLING. IT IS THE SLOW WAY WITH FUTURE ACCURATE OPERATION OF THE ATTACHMENT.
SPINDLE COLLET KEY Figure 9
The spindle collet key C , Figure 9, is threaded into the spindle and can be removed and replaced, in the event of wear or damage, without removing the headstocl, spindle or spindle bearíngs. Use a, -2 hexagon pin wrench to renıove lock screw; then remove collet key screw with same hexagon pin wrench.
LU6R1CAT10N OF HEADSTOCK SPINDLE EEARINGS
The headstock spindie is mounted oп precision preloaded bearings. The preloading and resu .ting load carryíng capacíty is engineered to take radial thrust or end thrust, or a combination of both.
The precision preloaded ball bearings are grease-packed for life and require no further lubrication. The entire bearing assembly is housed as a unit and is properly sealed to exclude dirt and foreign matter. The spindle bearing
seals are designed to operate at high speed without wear or friction.
There are occasions on a new machine when some of the excess grease in the spindle bearings will work its way out of the openíng at the bottom of the front bearing cap. The appearance of this excess grease does not affect the spindle bearings nor the fact that they are grease-packed for life.
Apply the desíred síze collet or step chuck to the machine spindle. Be sure the collet or step chuck and spíndle are clean.
2. Open collet pressing down at point B.
3. Engage the collet closer tube on the collet or step chuck and thread about two turns only. To turn the collet closer tube, the operator, usíng his left hand, turns the black she11 guard C , Figure 1 1, forward whíle he holds the coilet oг step chuck in place wíth hís ríght hand.
4. Place a work piece in the collet or step chuck.
5. Move lever D , Fígure 11, to the extreme left or closed posítíon and then turn shell guard C toward the operator untíl ít ís drawn up as far as it wíll go by hand. If headstock spíndle should turn, lock spíndle by pressíng in spíndle lock pin D , Figure 3, page 12. To engage lock pin into notches províded, turn the spíndle by hand untíl pin enters notch to lock.
6. Move lever D forward to the released position and turn shell guard toward operator so that latch A advances two notches on the adjusting nut.
7. Close latch A and test collet closer for tension on work. Should addítíonal grippíng pressure on the work be requíred, open latch A and turn shell guard C toward operator. For less gríppíng pressure, turn shell guard C away from operator.
The two adjustíng screws and lock nuts located at E , Fígure 11, are set at the factory. By adjustment of lock nuts E , lever yoke F ís raísed or lowered so there is no pressure on bearing G.
HOW TO REMOVE COLLET CLOSER Fígures 1 1 and 12
The collet closer should be removed from the machine when using jaw chucks,
face plates, fıxture plates or other nose type fıxtures.
Running the machine wíth the collet closer in place wíthout a collet will cause damage to the collet closer.
To remove the collet closer remove link pin H , Figure 11. This pin is easily removed by the use of a mallet and brass punch, striking pin at bottom.
CAUTION: DO NOT REMOVE COLLET CLOSER BY REMOVING
SCREW E , Figure 11. This screw ís adjusted properly at the factory for proper operation of collet closer. Remove link pin H , Fígure 11, only.
After removing pin H remove collet closer as shown in Figure 12. 1t is then necessary to remove adjusting nut A , Fígure 12. This ís done by pullíng nut straight off end of spíndle. DO NOT TURN ADIUSTING
NUT 1T 1S NOT THREADED TO SPINDLE.
The collet closer should be removed periodically for cleaning to prevent loading of chips between collet closer tube and inside of spindle at rear end.
APPLYING COLLET CLOSER Figure 12
Clean the inside of the headstock spindle before applying collet closer. Also, clean outsíde diameter at rear of spindle where adjusting nut locates. Clean collet cioser tube inside and out.
Apply a fılm of light oil on rear of headstock spindle and apply adjusting nut A , Fígure 12. App1y a fılm of líght oi1 on bearing section B , Figure 12, of collet closer tube and slide closer on machíne and insert línk pin
Figure 11.
Figure 12
SLIDE COLLET CLOSER TUBE INT0 HEADSTOCK SPINDLE CAREFULLY. DO NOT FORCE.
If ít does not go iri easily, remove and check for dirt, chips or burrs.
CAUTION: When threading draw tube onto collet and ít does not turn freely by hand, remove ít at once and check collet threads and draw tube threads, lookíng for dírt, chíps or damaged threads. Also check insíde diameter at rear end of headstock spíndle
and outsíde rear bearing diameter of draw tube.
Figure 13
CARRIAGE AND APRON Figure 13
Carriage handwheel A is used to move carriage along bed longítudinal movement. The adjustable whíte dial B is divided in increments of .010 and has a posítive lock C.
Cross Feed Screw Ball Crank Handle D is uscd foc hand feeding cross slide.
The black and white dial ís adjustable and has аosiεivc İock E. The dial is divided in increments of .001 and ís DIRECT READING. Direct reading means that when cross slide is moved one graduation or .001 the cutting tool will remove .001 from diameter of work.
Compound Slide tool post slide Ball Crank Handle F is used to feed the compound slide. The adjustable black and white dial is divided in increments of .001 and has a positive lock.
CARRIAGE AND APRON Continued
Three follower rest mounting holes G , Figure 13 are plugged with a screw to keep clean until used.
Tapped hole H , Figure 13, ıs for mounting carriage indicator stop. The hole is plugged with a screw to 1 portion of the stop ìs clamped to the dovetail bed. See page 58. Power Feed Clutch for carríage longitudínal feed , Figure 14, controls feed of the carriage along the bed. To release cIiitch, ρress lever down to positíon shown.
Power Feed Clutch for cross slide B , Figure 14, controls power cross feed.
Raíse ba11 handled lever to engage and push down to release
Lead screw nut handle C , Figure 14, ís to engage lεad screw nut for threading only. Hand1e is shown in released position. To engage move to right to  horizontal position. See page 30 for complete instructions on threading.
Fígure 14
Carriage lock D , Figure 14, ís used to lock carríage in a fıxed position on the bed when doíng heavy facing operations. HandIe is shown in released position to lock pull forward.
Apron and Clutch Lubrícatíon 
Lubricate carriage clutch and apron once a week at J , Figure 13, page 24.
Maintain oil level in sight gauge K , Figure 13. Use Duckhams oil or equivalent. Change oil every 60 days using drain plug located at bottom of apron.
POWER FEED CLUTCH DЈUSTMENT F06ı CARRIACE AND CROSS sLIDE
Figure 15
The power feed clutches are of the fríction type desígned to slip when overloaded, which protects the tool as Fígure 15 well as the machíne.
The clutches are a spring-loaded arrangement and cannot be adjusted for more puliing power. If the clutch slíps under cut ít is a sígn of ímproper or dull tool or excessive feed.
The clutch adjustment is necessary for assembly purposes and ís set at the factory and should not be changed. If for some reason the clutch ís taken apart ít ís necessary to readjust. To reach nut for adjustment remove metal cover as shown at A and B , Figure 15. Cover is threaded and has two spanner holes. Use end wrench and adjust as shown at B , Figure 15. 
When properly adjusted clutch wíll release when ball lever is about 15 below horízontal.
Three holes A , Figure 16, ín cross slide are for posítioníng and locking taper attachment. Ho1e B , Fígure 16, ís for mounting coolant hose and nozzle supportíng bracket and C , Fígure 16, ís tapped hole for locking screw for bracket.
Bolt D , Figure 16, ís to release cross slide nut when using taper atcachment.
See page 56 for complete instructíons on taper attachment.
Cover E , Fígure 16, encloses tool post slíde screw. It is necessary to remove cover before removing slíde. It is good practíce to occasionally remove slíde for cleaning and lubrícation of screw and nut.
The quick acting handle A , for compound slide, Figure 17, is used when threading or turníng to withdraw tool on return of carriage.
Carriage bed wipers B , Figure 17, are of hardened and ground steel mounted at both ends of carríage. Wípers are spríng-backed to hold wíper to carriage.
CARRIAGE AND BEDWAY LUBRICATION
COMPOUND SLIDE LOCK
The compound slíde swívels for the turning of angles or to set at 59 for threading. To turn slide for an angle settíng, 1oosen eccentric draw bolt, J ,  Figure 17, with ;, hexagon wrench. When tightening draw bolt, turn clockwise as if it were a ríght-hand thread.
CARRIAGE, CROSS SLIDE AND ĆOMPOUND SLIDE GIB ADJUSTMENT
CARRIAGE GIB ADJUSTMENT: After considerable use it may be necessary to adjust the carríage gib. The gib ıs the tapered type and adjustment is made
at H , Figure 17, page 27, as described below.

I. lnsert ,= hexagon wrench in adjusting screw A.
2. Loosen one  turn.
3. Push wrench on throi gh into adjusting screw B .
4. Advance adjusting screw B a fraction of a turn.
5. Pu11 wrench out of B and tighten A.
6. Test carriage for feel the carriage should have a slight drag, but should not bind.
Cross slide gíb is adjusted in same manner at F , Fígure 17, page 27. Compound slíde gib is adjusted at rear of slide at G.
NOTE: Excessive gib pressure or drag does not improve machine performance.
TO REMOVE CROSS SLIDE
1t ís good practíce to occasionally remove the cross slíde. To do this fırst remove cover K , Fígure 17, page 27. Turn the cross s1ide feed screw handle clockwíse untíl the slide comes off the back sıde of the carriage. With slíde removed it is easy to lubrícate cross feed screw and nuc and to clean the slíde ways. Use care when re-engagíng the cross feed nut and screw.
Bumpíng will bend the fırst thread of the nut, causíng it to bind on the screw.
Loosen nut L , Fígure 17, page 27, a few turns then push slide on untíl cross feed nut touches end of cross feed screw. Engage screw and nut by turníng ball crank handle counterclockwíse. Tighten nut L and re-position slide. Replace cover K.
TO ADJUST BACKLASH
To adjust backlash in crossfeed screw, D C B A remove bolt A and cover B .
Loosen cap screw C . Turn adjustíng screw D clockwise to reduce backlash. As adjusting screw D is .
tightened, check cross feed screw by turníng crank to prevent 
Fígure 18
POWER FEED FOR CARRIAGE
The carriage feed is powered by a direct current, totally enclosed, bearing motor mounted on the carriage. The motor ís connected to the clutch assembly by a worm gear.
Alternating current 1 10 volt is fed from the main electric control panel at the left-hand end of the pedestal base to the power feed control panel at the right-hand end of the machine. Here ít is converted by seleníum rectifıers to direct current for the power feed motor. The electric cable from control panel to power feed motor ís of oil resistant neoprene.
To start the power feed, posítion the sELECTOR swítch to the LEFT posítion. Machíne must be runníng before power feed will operate.
The LEFT-R1GHT swítch ís used to reverse the power feed motor.
Select the direction of feed required Ьy posítioning the LEFT-RIGHT  selector swítch accordingly. When placed in LEFT posítion carríage will feed toward left or toward headstock. When in R1GHT position carriage will feed toward right. When placed in STOP position power feed motor ís off.
In operatíon, the carríage ís advanced wíth the handwheel untíl the turning or boring tool ís next to the work. Then, the carríage clutch ís engaged.
The rate of carriage feed can then be increased or decreased by turning the feed control knob on the electric control panel. The rate of feed is determined by material beíng cut and the fınísh required. The rate of feed may be changed while the tool is undercut. Experience has shown that it is best to make a few sample pieces to determine the spindle speed and rate of feed that is best suíted to give desíred surface fınish and production rate. When making the test run, record the number at whích the power feed control knob was set when best results were o6taíned. Then, on the production run the operator can set the control knob to the reference num6ers on the face of the
control pane1 and obtain the same results as the test run. They do not represent eíther thousandths per revolution or ínches per mínute.
Fìgure 19
GEAR BOX FOR THREADING ONLY Figure 19
Prгcision threading is aп outstanding feature on the Hardinge HLV-H lathe.
The logical separation of the power feed and lead screw gear box reserves the precision gear box for threading on1y, assuring maximum precision for the lead screw drive.
The all-steel gears within the gear box run on shafts mounted on ball bearings.
These bearings are grease-pacl cd and sealed, requiring no further attention.
TO ENGAGE GEAR BOX
To engage the gear box turn knob A , Figure 19, coanterclockwise in the direction of arrow marked THREAD . When turniná knob A the teeth of the sliding gear within the gear box may not mesh with the headstock spindle gear teeth. If so, turn the headstock spindle by means of spindle handwheel B , Figure 19.
iMPORTANT: Before turníng spíndle, release spindle brake to obtain free spindle see ínstructíons on page 13. While turning spindle also turn knob A , Fígure 19, to left until a defınite click is heard.
IMPORTANT: Knob A , Figure 19, should always be set in the Feed posítíon except when threading, thus disconnecting gear 6ox from headstock spíndle.
The Hardínge HLV-H Lathe quick change gear box permíts instant selectíon of 27 different threads by shifting a lever and turníng a knob.
Knob C , or three change knob, Figure 19, has three numbered posítíons 
1, 2 and 3. These numbers correspond wíth the 1, 2 and 3 given at the extreme
left side of the gear box thread chart plate. To select the proper thread, numbers 1, 2 or 3 on knob C must be set at the bottom position to line up wíth the pointing arrow. The knob ís shown in the number 3 positíon in 
Figure 19. The tumbler or nine change handle E has nine positíons each lining up with gear box thread chart plate. Combining the three posítions of the three change knob and nine posítions of the tumbler handle, 27 changes are obtained.
THREE CHANGE KNOB Figure 19
When number one of knob C , Fígure 19, is in line with the arrow, any thread in row one of thread chart can be selected by changíng the tu m bler handle or nine change handle E , Fígure 19, to the desíred thread in that row.
The three change knob C , Figure 19, controls a sliding gear cluster. Number three on the knob, when lined up wíth the arrow on gear box chart, is in the centre position. To place knob C in the number one position, turn to RIGHT . Turn to LEFT to place number two posítíon in line wíth arrow.
In the event the sliding gear cluster does not engage the other gears ín the gear box properly to bring the desíred number on three change knob C in line with arrow, open the change gear cover D , Figure 19, and turn shaft A , Figure 20, page 33, Ьy hand until the gears mesh properly.
TUMBLER HANDLE OR NINE CHANGE HANDLE
To make a selection on the gear 6ox thread chart, pull te spring-pressured black knob E , Figure 19, out as far as it will go and lower until ít will move sideways to the desired notch directly under the thread required. Raise the handle and let plunger drop into hole. If the tumbler handle will not raíse far enough to drop plunger into hole, open change gear cover and rotate shaft A , Figure 20, see opposíte page, until gears mesh and handle ríses permítting plunger to seat.
At the extreme ríght on the gear chart is an OUT posicion whích ís used when change gears are set up outside the gear box for cutting threads not obtained within quick change gear box.
Fastened to the tumbler handle bracket withín the gear box is a - round safety bar C , Figure 20, that extends out through a hole in the left síde of the gear box. This bar ís to prevent applying change gears outsíde the gear box until the tum6ler handle is placed in the OUT posítíon.
IMPORTANT
Do not shift gears when rrıachine ís runníng. The Hardinge HLV-H Lathe is a smooth running high speed machine and shifcing of gears in the gear box when the machine is running will result in damage to the unit.
Figure 20 Fígure 21
OUTSIDE GHANGE GEARS Fígures 20 and 21
The outside change gears are used to cut threads not provided in the quick change gear box. A set of fıve gears and a bracket are standard equipment with each machíne. These gears, when set up to the gear chart see page 34 will cut 10 threads per ínch. Three of the gears are shipped on the bracket and the other two are in place on the shafts as shown in Figure 20, one on the end of the lead screw shaft A , and the other on the end of the slíding cluster gear shaft B.
Before setting up change gears, place tumbler in the OUT posítion.
To cut other threads whích are not in the gear box, addítíonal gears must be purchased see pages 34, 35, 36 and 37 where gearíng charts are gíven for threads from 10 to 250 threads per inch.
IMPORTANT: Lubricate bushings and shafts on change gear bracket with spindle oil each time a set up ís made. If long run threading ís involved, lubricate daily.
INSTRUCTIONS FOR THREAD CUTTING
The Hardinge HLV-H Lathe ІЅ desígned for rapid and accurate thread cuttíng.
Threads can be cut to a shoulder wíthout fear of runníng ínto the shoulder since the automatíc stops wíll stop the carriage at a predetermíned point in either direction.
Before startíng to cut a thread, select the proper cuttíng speed for the size of thread to be cut and to gíve the best fınish for the partícular materíal beíng used. Maximum recommended threading speed ís 1,000 
Set the quíck change gear box for desired pítch by engagíng the tumbler handle as outlined on page 32 and engagíng the gear box by turning knob A , Figure 19, page 30 counterclockwíse.
Set compound slíde at 1 less than thread angle and posítíon cuttíng tool in compound slíde tool post. Positíon carríage so cutting tool ís in the centre of the part to be threaded.
Carríage control lever F , Figure 19, page 30, when moved to the left will cause carríage to move to the left. When the carríage control lever ís moved to the ríght the carriage will move to the ríght. Carríage can be stopped manually at any tíme by placíng carríage control lever in the centre positíon as shown in Fígure 19, page 30.
Engage lead screw nut C , Figure 23, 6y moving ba11 handled lever D , Fígure 23, to the ríght as shown. Making certaín that lever F , Fígure 19, page 30 ís in the vertícal posítion; set left carríage stop A , Figure 22 and right carriage stop B , Fígure 23 approxímately i from end of carríage.
Wíth threadíng tool away from work toward operator, make a tríal run with the carríage. Píck up the exact relatíon between the tool and the shoulder or end of the thread by usıng top compound slíde. Run carríage to right, checking stop B 
CAUTION: Lock carrıage stops securely before startíng to cut threads.
Do not release carriage nut C , Figure 23, untíl threading operatíon ís completed. Do not use carriage stop when headstock spíndle ís runníng ín reverse.
LEFT-HAND THREADS can be cut the same as ríght-hand with the spindle running forward except cutting pass ís made from the headstock toward the taïlstock. Carriage control stops are used for left-hand threads as well as ríght-hand threads.
THREAD CUTTING continued
The illustratíon above shows the threading tool in position to start a threadíng pass. The carríage stop controlling the travel of the carriage to the right or toward the taılstock end of the machine when properly set places the tool about ; from end of work.
When carriage is at rest and quick acting handle A is to the right in the cutting posítion, feed the cutting tool in the desired number of thousandths for the next threading pass.
Move lever F , Figure 19, page 30, to the left and carriage will start and move untíl it contacts stop at headstock end of machine stopping carriage as shown in Figure 25, page 41.
Figure 25
THREAD  contínued
Thís illustratíon shows the cutter and carriage at the end of the threadıng pass. Notice that the threading tool is close to the shoulder the carríage was stopped in this position by the carriage stop which controls the lead screw. Headstock spíndle continues to run in the forward dírection. Carriage stops cause only the gear 6ox, Iead screw and carriage to stop running. When cuttíng left-hand threads, start the threading pass next to the shoulder and with the spindle runníng forward, make the threading pass toward the
tai lstock.

THREAD CUTTING continued
 above is the carriage in the same position on the bed as in Figure 25 only that quick actíng handle A on the compound slide has been moved to the left wíthdrawing tool from work. After withdrawing tool wíth quíck acting handle, the carríage ís reversed or moved to the ríght to the starting position by moving carríage control lever F , Figure 19, page 30, to the right.
Figure 27
TAILSTOCK Figure 27
The tailstock ís securely anchored to the dovetaíl bed by meaпѕ of locking lever B . To properly lock tailstock to bring ít on centre make sure lever ís all the way against stop pin
The hardened and ground spíndle is divided in e increments for the fu11 3;
travel. The handwheel has a black and white frictíon adjustable dial reading in .001 íncrements. The spindle takes standard No. 2 Morse taper shank centres and other tailstock toolíng see pages 61, 62 and 63.
The spindie can be locked in any posıtion Ьy locking lever A.
MACHINE SPECIFICATIONS

Varíable Speed Drivíng Unít complete with 2-ѕpeed motor.
Magnetíc Electric Contro1 Pane1 with transformer provídíng 230 volts for
control círcuit; time 1ag thermal overload relays provide overload protection: 1ow
voltage protectíon is a1so províded; cam operated, quick make and quick break forward
and reverse swítches; pílot líght, fused disconnect swítch ínterlocked wíth cover of
paпe1 entire pane1 is one self-contaíned unit.
Additional tooiing items are shown on pages 46 to 68
The Hardinge HLV-H Lathe takes 5C Hardinge collets with capacíty of 1,hexagon and ; square. Hardinge precísion collets are manufactured to exact precision standards, and are available in all types and sizes for all makes of lathes and míllíng machínes, as well as our own precision machines.
5C HARDINGE PLUG CHUCK
The collet shank section is flnished for dırect application to your machine spindle. The nose section is 1 in diameter and 1, - long. 1t can be machined in place for the greatest degree of accuracy to suit your particular requirements for special arbors.

UNIVERSAL COLLET STOP
Thís stop converts 5C Hardínge collets ínto solíd stop or spríng ejector stop collets, wíthout alteration of the standard collets. The applícation of this stop to the collet requíres no machiníng. In other words, all collets useå with thís machine can be used in the regular manner or as solid stop collets or as sprıng ejector stop collets.
LOCK NUT LOCKING PLUGS LOCKING SCREW 
COLLET STOP BODY STANDARD f2-20 THREAD
Dímensíon A ís equal to 1 é and ís the maximum depth a part may be chucked using a solid stop. The maximum depth for spríng ejector stop is . Thís ís due to space requíred for spríng ejector construction.

5C HARDINGE TAPER HOLE COLLETS
Hardínge 5C taper hole collets are hardened and precision ground for directapplication to the headstock spíndle. Avaílable wíth No. 1, 2, 3 Morse Taper.
Taper hole collets are useful in making tools having tapered shanks.
JAW 
Hardinge HLV-H Lathe ís supplied wíth a taper nose headstock spindie for rapid accurate mountíng of jaw chucks and other spindle nose attachments.
The 5 capacíty four jaw and 5 capacity three jaw chucks, shown above, are available for use with the HLV-H Lathe.
These chucks are integrally mounted for direct application to the taper nose spíndle, thus eliminatíng a separate mounting plate.

Fixture Plates

Fixture plates are precision-machined for direct application to the headstock spindle. They come in three available sizes with diameters of 3, 5, and 8 inches. Each plate features a thick flange section with a central hole. These plates can be machined to serve as fixtures or used for mounting specialized chucks or other fixtures to securely hold workpieces.

Slotted and Tapped Face Plates

These face plates are designed to hold irregularly shaped workpieces. They include drilled and tapped holes to accommodate standard bolts (typically ¼ x 18). This flexibility allows for customized setups to hold complex-shaped parts securely.

Angle Plate for Face Plate

The angle plate attaches directly to the T-slot of the face plate and supports workpieces at a right angle to the face plate surface. The clamping area measures 1¼ x 3 inches, providing stable support for various machining tasks.

Driving Dog

A driving dog works with a drive plate to secure workpieces between centers for lathe operations. For ordering, specify the taper nose spindle type and include the machine's serial number for compatibility.

5C Hardinge Step Chucks

Step chucks are highly effective for holding workpieces larger than 1½ inches up to 6 inches in diameter. They are ideal for tubing, castings, moldings, stampings, and machined parts, allowing secure gripping without deformation. The standard ball-bearing lever collet closer is used to close the step chuck, with the periphery taper of the chuck fitting into the closer's taper.

Regular Depth Capacity Step Chucks

Regular depth step chucks, available in diameters of 2, 3, 4, 5, and 6 inches, are kept in stock for immediate delivery. These chucks allow steps to be applied to a depth of ⅝ inch for their full rated capacity.

Extra Depth Capacity Step Chucks

Extra depth step chucks are also available in the same sizes (2, 3, 4, 5, and 6 inches) but offer a maximum step depth of 1¼ inches. These require a unique extra depth step chuck closer for each size, enhancing depth for gripping applications.

Step Chuck Closers

A specific step chuck closer is required for each step chuck size. The closer attaches directly to the machine spindle and includes a taper that aligns with the step chuck’s periphery for proper closing and greater accuracy. Step chucks and closers come in regular or extra depth capacities, and it’s essential to specify the type required (regular or extra depth) when ordering. Always specify the taper nose spindle and provide the machine's serial number to ensure compatibility.

ADVANTAGES OF STEP CHUCKS
Step chucks, developed by precision instrument makers, aгe a time-proven method of holding work, rigidly and accurately. Step chucks take over on sizes above the regular collet capacity, providing coiiet-iike accuracy, convenience, and precision results as with coflets.
WHEN U51NG STEP CHUCKS: Analyticaf consíderation of the gripping pressure applied on the work by a step chuck c1early shows one of the advantages of using step chucks. Note how the gripping pressure is uniformly

WORK HELD IN STEP CHUCK WORK REMOVED FROM STEP CHUCP
BORE 8 OUTSIDE
DıAMETER TR UE BORE 8 OUTSıDE
DISMETER TRUE
GRIPPING PRESSURE
distributed over the entire circumference of the work. The large grippïng aгea prevents distortion and eliminates marking of the work.
WHEN USING JAW CHUCKS: Studied consideration of the gripping pressure applied on the work by a jaw chuck clearly shows the disadvantage of using jaw chucks for precision work.
WORK HELD IN JAW CHUCK AND BORED WORK REMOVED FROM JAW CHUCK
WORK
TAPER TURNING ATTACHMENT
The turníng or boring of precision tapers is readíly accomplished on the Hardınge HLV-H Lathe by the use of a taper turníng attachment. The Hardínge taper turníng attachment is based on the sine bar princıple swivelling the guíde bar from one end. See page 3 for a typical taper turníng set-up.
The taper turning attachment mounts dírectly on the back of the lathe bed  ís adjustable along the bed to suit the work.
In operatíon, the taper turníng attachment is moved into positíon to suít the work by looseníng two nuts 1 . Cleaп attachment of all chíps and foreígn matter. Then place the cross slide in position so that bolt A , shown in illustratíon above, caп Ьe placed through any one of the three holes B іn the cross slide to engage shoe C. Wíth the cutting tool in position and taper attachment secured to cross slide, release 16 hexagon cap screw D two turns DO NOT REMOVE CAP SCREW. All adjustments of taper attachment are made with , 6 wrench.

TAPER TURNING ATTACHMENT contínued
To set guide bar E to the desíred angle, loosen cap screw F. Cap screw F is located on the undersíde of the taper attachment body. Swing guide bar E to desired angle or taper per foot according to graduatıon viewed through zero plate G.
Lock guıde bar in place with cap screw F and tighten cap screw A.
Make a test cut. It may be necessary to move guide bar a very small amount
to obtaín the exact taper for a blued fıt to the taper gauge. Loosen cap screw F and A a very small amount and tap guide bar lightly to move ít into positíon to gíve exact taper. Then lock cap screws F and A tíght. When tapping guíde bar E strike it on hardened pins H protruding from the surface at the sides of the guide bar.
Lubricate guide bar with spindle oil.
IMPORTANT: When turníng or boring a taper be sure the cutting tool ís exactly on centre; otherwise a true taper will not be produced.
When the taper attachment ís not in use keep at tailstock end of the bed.

MICROMETER CARRIAGE STOP WITH DIAL INDICATOR
The mícrometer carriage stop ís a useful accessory when producíng parts havıng exact shoulder lengths.
A11 Hardinge Lathes are now equipped with a tapped hole in the carriage for fastening the micrometer to the carriage. The bracket carrying the índícator mounts dírectly to the hardened and ground dovetaíl bed ways.
The índicator reads in .005 íncrements. The mícrometer reads in .001 .
Measurements are made wíth the mícrometer. Carríage is moved until the ındıcator reads zero.

STEADY REST
Long cylindrícal work held between centre requires a steady rest to prevent
such work from springíng away from a cuttíng too1. A steady rest is also used
when there are machining operations to be performed on the end of work
whích prohibíts the use of the tailstock centre. The three jaws are adjustable
and have an accurate fıt in the machíned guídes of the body. The top section
ís hínged to províde ease in loading shoulder work without disturbing the
setting of the jaws. The steady rest has a maximum capacity of 3

RADIUS TURNING ATTACHMENT
This attachment fastens dírectly to the dovetail 6ed, as shown above, and is
used for precisíon turnıng concave or convex surfaces up to 1? radius.
Useful for turning punches, díes, ba11-shaped valve seats and special spherical
cutting tools.
The swivel slide ís mounted on precisíon preloaded 6a11 bearings for accuracy
and rígídíty. The swivel slide moves through 3600. Hardened feed screws are
mounted on preloaded ba11 bearíngs and have adjustable díals graduated in
thousandths of an inch.
LAMP
MALE CENTRE
Thís male centre has a 16 head díameter and is furnished with all Hardinge taílstocks. All centres are hardened and ground.
FEMALE CENTRE
A female centre is used for work that cannot have the usual centre hole. The head has a 600 conical hole e in diameter at the large end.
HALF CENTRE
A half centre is used if tool clearance is desíred when turning the full length of a part supported by the tailstock. The head díameter is
LARGE CENTRE
Thıs centre has a head díameter of 1 . It ís ındispensable for supporting iubing or recessed work too large for the standard male centre.
Y CENTRE
The swivel Vi centre is constructed so the V block rotates oп the shank.
DRILL PLATE 
The drill plate, when in place in the tailstock spindie, is used to support work at right-angles to the machine spindle centre 1ine. The plate is made of close grained cast iron and has a steel taper shank. The fınished face surface is 3 in diameter.
When orderíng, specífy No. 2 Morse Tapeг 5hank.
DRILL CHUCK
We recommend the improved type dri11 chucks with our tailstocks. We carry Q- , 0- and 0-? sizes in stock moun_ed ready for use.
ANTI-FRICTIC+N CENTRE FOR TAILSTOCK
This heavy duty anti-friction centre has a No. 2 Morse Taper shank for direct applicatıon to the tailstock spindle. Work can be done between centres at hígh speed when the anti-friction centre is used.
TO CUT METRIC THREADS
By the application of a metric attachment to the gear box, in place of the 
English bracket for the outside change gears, metríc threads can 6e cut. For threadíng, follow the same procedure as when settíng up Englísh threads as descríbed on page 33.
Gears supplied for the Englísh outsíde gear can a1so be used in the gear set-up
for metric threads.
When metric attachment is supplied with machine, Iarge gear cover is shipped as standard equípment. When the metríc attachment is supplied later, the large cover ís supplied to replace the standard cover.
 
All Hardìnge HLV-H Lathes can be-províded with the coolant Facilitíes required for hígh speed work. The coolant pump ís conveniently located at the rear of the machíne and above the sump IeveI, thus eliminating troubiesome check valves.
The centrifugal type pu,mp needs n priming and is controlled by a switcı conveniently located in the control box on the headstock of the machine. Refer to page 11 for coolant pump switch .
ínstructions.
The pump wíll handle most common types of oil and water coolants.
Clean sump regularly, depending upon type of material being run.
When machíning cast iron or other powdery materíal wìthout coolant, close sump screen cover to prevent powdery materíal from mixing wíth coolant.
CAUTION: When usíng water soluble coolant, be sure the míxture is correct to prevent rusting of the machíne and work.
To c1ean sump remove the four screws, one in each corner of the screen cover for sump. Lift screen cover from sump. C1ean sump. Rinse out and drain sump by removing pipe plug from bottom of sump. This pIug is easily accessí6le from the back of the machine.