July 2013 6.8 The control loop 831
Tolerance
consideration with
M128 or TCPM
When working with M128 or TCPM, the rotary axes necessitate
compensating movements in the main axes. Since rotary axes mostly do not
have the same dynamics that linear axes have, machining is slower when
rotary axes are involved.
During program run with M128 or TCPM, the head dimensions are also
included in the tolerance consideration (MP1202.x, Cycle 32).
A higher tolerance is usually permissible for rotary axes, since this does not
affect the accuracy (when using a spherical cutter). This higher tolerance leads
to shorter positioning times of the rotary axes and the better surfaces:
Under TA in Cycle 32, program a separate tolerance for rotary axes.
Because of this tolerance, a separate nominal position value filter is used for
rotary axes.
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