johansson 3u universal grinding machine

johansson 3u UNIVERSAL PRODUCTION CYLINDRICAL GRINDING MACHINE

THE BED consists of two units, wheelhead bed and table bed. Both are rigid and the table bed contains 4 heavy longitudinal walls forming an indeformable base. With the leveling devices supplied, the bed can be leveled and aligned.

THE WHEELHEAD SUPPORT swivels and is equipped with an air operated lifting arrangement to facilitate swiveling.

THE TAILSTOCK is equipped with a screw-operated barrel located in adjustable sleeve bearings and provided with a barrel clamp. An air-operated lifting arrangement is also provided to facilitate positioning of the tailstock.

THE WHEELHEAD rigid, nitrided spindle is located in multi-surface bearings. The bearings are automatically lubricated by a separate oil pump on the wheelhead.

THE TABLE consists of 2 units. The sliding table is guided in hand scraped slideways, one flat- and one V-way. The swivel table is rigidly supported and provided with scale and dial indicator for accurate angular adjustment.

UNIVERSAL PRODUCTION CYLINDRICAL GRINDING MACHINE

Standard equipment Extra equipment Grinding wheel guard for grinding wheels Internal grinding attachment Grinding wheel mount for grinding wheels Equipment for automatic gauge sizing Coolant nozzle for grinding wheels Hydraulic profile dressing device Balancing mandrel for the grinding wheels Table mounted dressing attachments Dressing device mounted on the tailstock for straight Hydraulic table clamp Carbide tipped centers Steady rests Splash guards DC-drive for the grinding wheel spindle Service tools Coolant clarifier

THE WHEELHEAD is divided into 3 different systems: manual feed, rapid traverse, and automatic infeed. Manual feed is applied through a handwheel or through a hydraulic motor located in the wheelhead bed.

The hydraulic rapid traverse has a fixed stroke with an accurate positive stop and permits quick and safe retraction of the wheel.

The infinitely variable infeed is applied for plunge grinding as well as for traverse grinding.

THE TABLE MOVEMENT is hydraulic with infinitely variable speed. An adjustable delay can be set to operate at the left, right, or both reversing points.

SINGLE LEVER CONTROL Starting and stopping of infeed, workhead, and coolant flow with one lever.

Techni1cal data

CAPACITY Max. grinding length =distance between centers Center height Largest diameter ground with new wheel Smallest diameter ground with used wheel Max. weight between centers Max. swivel of top table half-angle WHEELHEAD Largest grinding wheel with standard wheelguard Widest grinding wheel Grinding wheel motor WHEELHEAD INFEED Max. stock removal for traverse grinding Automatic infeed for plunge grinding Rapid traverse, length Manua1 feed length hydraulic motor drive TABLE Table speed, hydraulic with infinitely variable speed Reversing accuracy Delay at one or both reversing points

WORKHEAD Internal taper front end of spindle Speed range Drive motor

WORKHEAD Max. swivel Internal taper front end of spindle Spindle nose front end of spindle Clearance through spindle diameter Speed range Drive motor

TAILSTOCK Internal taper Barrel stroke

WEIGHTS Weight of machine

THE HYDRAULIC UNIT is a separate unit placed outside the machine. Two screw pumps supply the system with pressure oil, while the hydraulic motor for the wheelhead displacement is fed by a separate pump.

THE LUBRICATION SYSTEM is provided with a separate pump, located in the wheelhead bed.

THE ELECTRICAL EQUIPMENT is complete for direct connection to power supply.

THE COOLANT SYSTEM consists of a separate mobile tank, complete with pump, motor, and all necessary piping.