Hirth Coupling - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

6.19 Hirth Coupling

MANUAL operating

operating mode

The Hirth coupling describes a type of clamping of rotary axes and swivel

heads. Finely splined disks mesh together in order to create a rigid connection.

During datum setting, the NC rounds according to the grid spacing from

Configure the exact positioning in the Hirth grid as PLC positioning.

As soon as an axis direction key is pressed, the NC resets the corresponding

bit in W1026 (axis in position).

As soon as the axis-in-position bit is set again, you check the nominal

position with the Hirth grid and derive from it a PLC positioning command to

the next grid point.

For the current handwheel axis, the corresponding bit is reset in W1026 (axis

in position).

As soon as you select another handwheel axis, "axis in position" is set for the

previous axis.

The Hirth axis can be positioned with the handwheel:

Check the actual position with the Hirth grid and derive from it a PLC

positioning to the next grid point.

The positions of the Hirth axis must be programmed in the grid:

Check the positions in the PLC during the program run.

As soon as "axis in position" is reset, check the target position with the

• If the target position is not in the Hirth grid, output a PLC error message.

Hirth coupling for axes 1 to 9

0: No Hirth coupling

1: Hirth coupling

Prescribed increment for Hirth coupling

0.0000 to 30.0000 [°]

HEIDENHAIN Technical Manual TNC 426, TNC 430