HEIDENHAIN MANUALPLUS 620 - 6.9.1 Hirth coupling

702 HEIDENHAIN Technical Manual MANUALplus 620
6.9.1 Hirth coupling
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.
With the MP_isHirth parameter you specify whether the axis is capable of
Hirth coupling. The parameter is optional. The Hirth axis is active as soon as
you insert the MP_isHirth parameter and enter a grid increment in [°]
measured from the machine datum.
With the MP_moveAfterRefType machine parameter you specify the type of
movement after crossing the reference mark. For the Hirth axis you can
specify either positive or negative direction of approach to the next Hirth grid
position after a reference run.
Use PLC Module 9038 (Read Status Information of Axes) number 4 to
ascertain the active Hirth axes. Use PLC Module 9038 number 5 to read the
Hirth grid increment from the machine configuration.
With Module 9125 you stop a PLC axis at the next Hirth grid position.
 Configure the exact positioning of the axis in the Hirth grid as PLC
positioning (Modules 9120, 9121, 9125 and 9122).
Manual Operation
mode
As soon as an axis direction key is pressed, the MANUALplus 620 resets the
marker in NN_AxInPosition (axis in position).
 As soon as the axis-in-position bit is set again, compare the nominal position
with the Hirth grid and derive from it a PLC positioning command to the next
grid point.
Settings in the configuration editor MP number
Axes
PhysicalAxis
[Key name of the axis]
CfgAxis
isHirth 300103
Axes
ParameterSets
[Key name of the parameter set]
CfgReferencing
moveAfterRefType 400410