Using the facing head with FACING HEAD POS (option 50)

Application

With a facing slide, also called boring head, you can perform almost all turning operations with fewer different tools. The slide position of the facing slide in the X direction can be programmed. On the facing slide you mount, for example, a longitudinal turning tool that you call with a TOOL CALL block.

Requirements

  • Combined milling/turning (software option 50)
  • Control prepared by the machine manufacturer
  • The machine manufacturer must take the facing head into account in the kinematics.

  • Kinematics with facing head activated
  • Switching the operating mode with FUNCTION MODE

  • Workpiece datum in the working plane is at the center of the rotationally symmetrical contour
  • With a facing head, the workpiece datum must not be in the center of the rotary table, because the tool spindle rotates.

    Datum shift with TRANS DATUM

Description of function

 
Machine

Refer to your machine manual.

The machine manufacturer can provide his own cycles for working with a facing slide. The standard functional range is described below.

The facing head is defined as a turning tool.

Turning tool table toolturn.trn (option 50)

  • Please note for tool calls:
  • TOOL CALL block without tool axis
  • Cutting speed and spindle speed with TURNDATA SPIN
  • Switch the spindle on with M3 or M4

Machining also works with a tilted working plane and on workpieces that are not rotationally symmetric.

If you move with the facing head without the FACING HEAD POS function, you must program the motions of the facing head with the U axis, e.g. in the Manual operation application. If the FACING HEAD POS function is active, program the facing head with the X axis.

When you activate the facing head, the control automatically positions itself at the workpiece datum in X and Y. To avoid collisions, you can define a safe height using the HEIGHT syntax element.

The facing head is deactivated with the FUNCTION FACING HEAD function.

Input

Activating the facing head

NC programs contained in this User's Manual are suggestions for solutions. The NC programs or individual NC blocks must be adapted before being used on a machine.

  • Change the following contents as needed:
  • Tools
  • Cutting parameters
  • Feed rates
  • Clearance height or safe position
  • Machine-specific positions, e.g. with M91
  • Paths of program calls

Some NC programs depend on the machine kinematics. Adapt these NC programs to your machine kinematics before the first test run.

In addition, test the NC programs using the simulation before the actual program run.

 
Tip

With a program test you determine whether the NC program can be used with the available software options, the active machine kinematics and the current machine configuration.

11 FACING HEAD POS HEIGHT+100 FMAX

; Activate facing head and move with rapid traverse to safe height Z+100

The NC function includes the following syntax elements:

Syntax element

Meaning

FACING HEAD POS

Activate the syntax initiator for the facing head

HEIGHT

Safe height in the tool axis

Optional syntax element

F or FMAX

Approach safe height with defined feed rate or rapid traverse

Optional syntax element

M

Additional function

Optional syntax element

Deactivating the facing head

NC programs contained in this User's Manual are suggestions for solutions. The NC programs or individual NC blocks must be adapted before being used on a machine.

  • Change the following contents as needed:
  • Tools
  • Cutting parameters
  • Feed rates
  • Clearance height or safe position
  • Machine-specific positions, e.g. with M91
  • Paths of program calls

Some NC programs depend on the machine kinematics. Adapt these NC programs to your machine kinematics before the first test run.

In addition, test the NC programs using the simulation before the actual program run.

 
Tip

With a program test you determine whether the NC program can be used with the available software options, the active machine kinematics and the current machine configuration.

11 FUNCTION FACING HEAD OFF

; Deactivate facing head

The NC function includes the following syntax elements:

Syntax element

Meaning

FUNCTION FACING HEAD OFF

Deactivate the syntax initiator for the facing head

Notes

 
Notice
Caution: Danger to the tool and workpiece!
For a facing slide to be used, a kinematic model prepared by the machine manufacturer must be selected by means of the function FUNCTION MODE TURN. In this kinematic model, the control implements the programmed X-axis movements of the facing slide as U-axis movements when the FACING HEAD function is active. When the FACING HEAD function is not active and in Manual operation mode, this automated implementation does not take place. As a result, X axis movements (programmed or axis key) will be performed in the X axis. In this case, the facing slide must be moved with the U axis. There is a risk of collision during retraction or manual movements!
  1. Position facing slide at home position with active FACING HEAD POS function
  2. Retract facing slide with active FACING HEAD POS function
  3. In Manual operation mode, move the facing slide with the U axis key
  4. Because the Tilt the working plane function is possible, pay attention to the 3D ROT status
  • To set a spindle speed limitation you can use the NMAX value from the tool table as well as SMAX value from FUNCTION TURNDATA SPIN.
  • The following constraints apply to the use of a facing slide:
    • Miscellaneous functions M91 and M92 cannot be used
    • Retraction with M140 is not possible
    • TCPM or M128 are not possible (option 9)
    • DCM collision monitoring cannot be used (option 40)
    • Cycles 800, 801, and 880 cannot be used
  • If you are using the facing slide in the tilted working plane, please note the following:
    • The control calculates the tilted working plane as in milling mode. The COORD ROT and TABLE ROT functions, as well as SYM (SEQ), refer to the XY plane.
    • Tilting solution

    • HEIDENHAIN recommends using the TURN positioning behavior. The MOVE positioning behavior is not the best option in combination with the facing slide.
    • Rotary axis positioning