Heidenhain Positip 855 for lathe

Heidenhain Positip 855 lathe

Software Version

This User's Manual is for POSITIP 855 models with the following software version:

Progr. 246 xxx 02.

The x's can be any numbers. The software version of your unit is shown on a label on the rear panel.

About this Manual

This manual is divided into two parts:

- **Part 1: Operating Instructions** starts on page 5
- **Part 2: Technical Information** starts on page 57

**Operating Instructions**

When using the POSITIP 855 in your work, you need only refer to the Operating Instructions (Part 1).

If you're a beginner with POSITIP, you can use the operating instructions as a step-by-step workbook. This part begins with a short introduction to the basics of coordinate systems and position feedback, and provides an overview of the available features. Each feature is explained in detail, using an example which you can immediately try out on the machine — so you won't get "lost" too deeply in the theory. As a beginner, you should work through all the examples presented.

If you're already an expert POSITIP user, you can use the operating instructions as a comprehensive review and reference guide. The clear layout and the subject index make it easy to find the desired topics.

Technical Information

If you are interfacing the POSITIP 855 to a machine or wish to use the data interfaces, refer to the technical information in Part 2.

Subject Index

A subject index for both parts of this manual starts on page 84.

Part 1: Operating Instructions

1-1 Fundamentals of Positioning ..........7

1-2 Working with POSITIP - First Steps .......13
  - Before you start ................. 13
  - Switch-on ............... 13
  - Operating modes .............. 14
  - The HELP, MOD and INFO functions ........... 14
  - Selecting soft-key functions ................ 15
  - On-screen operating instructions ............... 15
  - Error messages .................... 16
  - Selecting the unit of measurement .................. 16
  - Selecting position display modes ............... 17
  - Entering tool data and setting the datum ............. 18
  - Displaying and moving to positions ............... 22
  - Turning with oversizes .................. 22

1-3 Programming POSITIP ...............27
  - Operating mode PROGRAMMING AND EDITING ..... 27
  - Selecting a program ........................... 28
  - Deleting programs ................. 28
  - Editing programs ............... 29
  - Entering program blocks .............. 30
  - Calling tool data from a program .................. 32
  - Transferring positions: Teach-in mode ............. 33
  - Multipass cycle ................... 36
  - Entering program interruptions ..................... 38
  - Subprograms and program section repeats ........ 39
  - Editing existing programs ................ 44
  - Deleting program blocks ..................... 45
  - Transferring programs over the data interface .......... 46

1-4 Executing Programs..................... 49
1-5 INFO: Pocket Calculator, Stopwatch, Taper Calculator ....... 51
  - To access the INFO functions .................. 51
  - Taper calculator ......................... 52
  - Stopwatch ............................ 53
  - Pocket calculator ......................... 53

1-6 User Parameters: The MOD Function ........... 55
  - Scaling factors .................... 55
  - Entering user parameters ........................ 56

Part 2: Technical Information ................ 57

Subject Index ...................... 84

**Nominal Position, Actual Position, and Distance-to-Go**

The positions the tool is intended to move to are termed the nominal positions, while the current position of the tool at any given time is referred to as the actual position. The difference between the nominal and actual positions is known as the distance-to-go.

**Sign for Distance-to-Go**

The distance-to-go is positive when the path from the actual position to the nominal position is in the negative axis direction. Conversely, it is negative when the path is in the positive axis direction.

Absolute Workpiece Positions

Each position on the workpiece is uniquely defined by its absolute coordinates. For instance, the absolute coordinates of position 10 are: X = 5 mm, Z = -35 mm. Similarly, the absolute coordinates of position ® are: X = 15 mm, Z = -65 mm. When working with absolute dimensions from a workpiece drawing, the tool is moved to these specific coordinates.

Incremental Workpiece Positions

Positions can also be defined relative to the previous nominal position. These are termed incremental coordinates or chain dimensions, as the position is defined by a chain of dimensions. Incremental coordinates are identified by a preceding I.

Example:
- Incremental coordinates of position OO referenced to position 10: IX = 10 mm, IZ = 0 mm
- Incremental coordinates of position ~2 referenced to position ®: IZ = -30 mm
- Incremental coordinates of position ® referenced to position 10: 2X = 10 mm, IZ = -30 mm

When working with incremental dimensions from a workpiece drawing, the tool is moved by these specified dimensions.

Sign for Incremental Dimensioning

An incremental dimension has a positive sign when the axis is moved in the positive direction, and a negative sign when the axis is moved in the negative direction.

Position Encoders

Position encoders are responsible for converting the movements of the machine axes into electrical signals. POSITIP then interprets these signals, determines the actual position of the machine axes, and displays it as a numerical value.

If power is interrupted, the correlation between the machine axis positions and the calculated actual positions is lost. However, the reference marks on the position encoders and the reference mark evaluation feature (REF) allow POSITIP to restore this correlation when power is restored.

Reference Marks

The scales of the position encoders contain one or more reference marks. When a reference mark is crossed over, a signal is generated, identifying that position as a reference point (with the scale datum equating to the machine datum).

When a reference mark is crossed, POSITIP's reference mark evaluation feature re-establishes the relationship between the axis slide positions and display values, based on the datum previously set. If the linear encoders have distance-coded reference marks, it's only necessary to move the machine axes a maximum of 20 mm to achieve this restoration.

Selecting Position Display Modes

Radius/Diameter Display

Drawings for lathe parts typically provide diameter values, but when machining, the tool is typically moved in radius values. POSITIP offers the flexibility to display either the radius or diameter.

- When displaying diameter, the diameter symbol (Ø) accompanies the position value.
  - *Example:* Radius display, position O X= 20 mm
              Diameter display, position О X= 405 mm

To switch the display:
1. Press MOD.
2. Navigate with the paging keys to the soft key row containing "Radius" or "Dia."
3. Press the appropriate soft key to toggle between radius and diameter display.

Separate Value/Sum Display

Separate Value Display:
In this mode, the positions of the saddle and top slide are shown separately, each referenced to their respective datum points. When an axis slide moves, only the display for that axis changes. The top slide is indicated with a small "O" next to the position, for example, Zp.

Sum Display:
In this mode, the position values of the saddle and top slide are summed together, showing the absolute position of the tool relative to the workpiece datum. When the sum display mode is active, a small "S" is shown next to the axis designation, for example, ZS.

Example:
- Separate value: Z=+25.000 mm, Zp = +15.000 mm
- Sum display: ZS =+40.000 mm

To switch the display:
1. Press MOD.
2. Navigate with the paging keys to the soft key row containing "Sum" or "Separate."
3. Press the appropriate soft key to toggle between separate value display and sum display, or vice versa.

**1-3 Programming POSITIP**

**Operating Mode: PROGRAMMING AND EDITING**

The functions available in the PROGRAMMING AND EDITING mode are categorized into four groups:

1. **Programming Mode:** For entering, running, and editing programs.
2. **Teach-in Mode:**
3. **External Mode:** For transferring programs to an external device.
4. **Deleting Programs:**

Programs comprise the work steps for machining a workpiece. You can edit programs, add work steps, and run them as needed. POSITIP can store up to 20 programs with a maximum of 2000 nominal positions, and each program can contain a maximum of 1000 nominal positions.

The External mode allows you to store programs with the HEIDENHAIN FE 401 floppy disk unit and reload them into POSITIP as needed. Additionally, programs can be transferred to a personal computer or printer.

Programmable Functions:
- Nominal position values
- Interrupt program
- Multipass cycle
- Program section repeats
- Subprogramming
- Transfer position: Teach-in mode

Transferring Positions: Teach-in Mode
This mode enables you to directly transfer the actual positions of the tool into a program, saving considerable keying effort.

Preparation:
- Select the program you want to transfer positions into.
- Select the tool number with the vertical arrow keys.

Programming Example for TEACH-IN / DISTANCE TO GO:
- Generating a program while turning a shoulder.

Subprograms and Program Section Repeats:
These elements only need to be entered once in the program and can be run up to 999 times. Labels mark the beginning of subprograms or program section repeats.

Inserting Program Marks (Labels):
- Labels 1 to 99 mark the beginning of a subprogram or program section repeat.
- Label 0 is used to identify the end of a subprogram.
- Subprograms and program section repeats are called with the command CALL LBL.
- Nesting program sections: Subprograms and program section repeats can be nested, with a maximum nesting depth of 8 levels.

**1-4 Executing Programs**

Programs are executed in the operating mode EXECUTE PROGRAM. The current program block is displayed at the top of the screen.

There are two ways to run programs:

**Single Block:**
- Move the axis to the displayed position.
- Call the next block with the soft key "Next Block."
- Recommended for running a program for the first time.

**Automatic:**
- The display automatically shows the next program block as soon as you have moved to the displayed position.
- Use Automatic when you are confident the program contains no errors and you want to run it quickly.

Preparation:
- Clamp the part to be turned.
- Press MOD.
- Check the settings of the user parameters Oversize OFF/ON and Scaling Factor OFF/ON. Normal setting: OFF.
- Select the appropriate user parameters for the position display based on the values entered in the program. Normal: Sum Z, Radius Z, Diameter X.
- Press MOD again.
- Select the tool with the vertical arrow keys.
- Set the workpiece datum.
- Select the program to be executed with Program Number in the main menu EXECUTE PROGRAM.

1-6 User Parameters: The MOD Function

User parameters are operating parameters which you can change without having to enter a code number. The machine builder decides which operating parameters are available to you as user parameters as well as how the user parameters are arranged in the soft keys. The functions of user parameters are described in Chapter 11 - 2.

To access the user parameter menu:
- Press MOD.
- The user parameters appear on the screen.
- Go to the soft key row with the desired user parameter.
- Press the soft key for the desired user parameter.

To leave the user parameter menu:
- Press MOD.

Scaling factors:
- The user parameter Scaling Factor enables you to increase or decrease the size of workpieces. POSITIP divides the displayed value by the scaling factor you entered.
- Scaling factors change the workpiece size symmetrically about the datum. The workpiece datum should therefore be located at an edge when you are working with scaling factors.
- Input range: 0.1 to 9.999999.

To activate scaling factors:
- Switch the user parameter Scaling Factor OFF/ON to ON.

To deactivate scaling factors:
- Switch the user parameter Scaling Factor OFF/ON to OFF.

Please turn to the next page for instructions on entering scaling factors.

Entering user parameters involves choosing settings and sometimes entering values. Here's how it works:

Choosing settings:
- For some user parameter settings, you can directly switch between options using soft keys.
- For example, to switch between radius and diameter display for the X axis:
  - Press MOD.
  - The MOD main menu will show soft keys like Dia. X or Radius X.
  - Press the displayed soft key to toggle between the options.
  - Press MOD again to confirm and exit the MOD function. The new setting takes effect.

Entering values:
- Some user parameters require you to enter a specific value or select a setting from a menu.
- For instance, setting the scaling factor for the Z axis:
  - Press MOD.
  - Press the soft key "Scaling Factor Z."
  - POSITIP will display an input screen for the scaling factor.
  - Enter the desired scaling factor, e.g., 0.75.
  - Press ENT to confirm.
  - If you want this scaling factor to apply to all coordinate axes, press the soft key "Set All."
  - Press MOD again to confirm and exit the MOD function. The scaling factor is now active.

11-2 Operating Parameters

Operating parameters, identified with the letter P followed by a three-digit number and a name, adapt POSITIP to the machine. Some parameters require separate entries for each axis.

Factory settings are highlighted in bold italics. The current setting of an operating parameter is shown in plain language under the parameter designation in the on-screen operating parameter list.

To access the operating parameters:
- Press MOD.
- Go to the soft key row containing Operat. Param.
- Press the soft key Operat. Param.
- Enter the code number 95148.
- Confirm your entry by pressing the ENT key.
- Display the operating parameters one after the other with the vertical arrow keys; or
- Go directly to an operating parameter by pressing GOTO, entering the parameter number, and confirming with ENT.

To change parameter settings:
- Operating parameter settings can be changed by selecting the new setting or entering a numerical value.
- Select a new setting by pressing the horizontal arrow key, or enter a numerical value directly and confirm your entry with ENT.
- The horizontal arrow key has no function with parameters that only allow direct numerical entry.

Transferring operating parameters over the data interface:
- You can save the operating parameters on the FE 401 B floppy disk unit or a PC and read them into POSITIP again whenever required.
- To read out parameters, enter the program number under which you wish to save the operating parameters, and press the soft key Param. output.
- To download parameters, enter the program number under which the operating parameters are stored on the diskette, and press the soft key Param. Input. POSITIP replaces all operating parameter settings in its memory with those on the diskette.

11-3 Encoders and Measured Value Display

This chapter describes all operating parameters for encoders and measured value display. Most entries can be found in the operating instructions for your encoder. Chapter 11-2 contains a list of operating parameters in which you can record your entries.

11-4 Data Interface

The POSITIP's data interface allows you to save programs and operating parameters on diskette, or print out or save coordinates. This chapter covers what you need to know about setting up the data interface, including the pin layout, signal levels, wiring, baud rate, data format, and connections.

Switching Inputs and Outputs:

Switching signals at the D-sub connection EXT allow you to reset the actual value display of a coordinate axis to zero, control motor cutoff, and start measured value output. Interface X41 (EXT) complies with recommendations for separation from line power.

11-7 Specifications

POSITIP

- Axes: Up to 4 axes from X, Y, Z, A, B, C, U, V, W
- Display: Flat luminescent screen showing position values, dialogs, entries, and graphics
- Status Display: Operating mode, REF, inches, scaling factor
- Graphic Positioning Aid: With distance-to-go display, oversize, feed rate, tool number
- Diameter Display: Sum display ZS and/or Xs
- Position Encoders: Incremental HEIDENHAIN linear encoders with sinusoidal output signals
- Display Step: Linear axes: 5 μm, 1 μm, or finer (to 0.02 μm)
- Functions: REF reference mark evaluation, distance-to-go mode, nominal position absolute or incremental, scaling factor, linear machine error compensation, HELP: on-screen operating instructions, INFO: pocket calculator, stopwatch, taper calculator, one datum point and table for up to 99 tools, oversizes, freezing the displayed tool position during retraction (note/set)
- Programming Memory: For up to 20 programs and a total of 2000 program blocks, up to 1000 blocks per program, subprogramming, teach-in (actual-position capture), multipass cycle in the program
- Data Interface: RS-232-C/V.24; for output of programs, measured values, and parameters, baud rate: 110/150/300/600/1200/2400/4800/9600/19200/38400
- Accessories: Floppy disk unit for external storage of programs, tilting base
- Switching Outputs: 8 digital outputs (24 V), assigned to the axes with parameters, 1 "POSITIP is ready for operation" digital output
- Switching Inputs: 1 input for each axis for zero reset, 2 inputs for measured value output (pulse or contact)
- Power Source: Switching power supply 100 V to 240 V (-15% to +10%), 48 to 62 Hz
- Power Consumption: 24 W
- Operating Temperature: 0° to 45° C (32° to 113° F)
- Storage Temperature: -30° to 70° C (-22° to 158° F)
- Weight: 4.8 kg