HEIDENHAIN TNC 620 User Manual page 233

Miscellaneous functions | Miscellaneous functions for path behavior
Behavior for circular arcs with M110
With circular arcs, the control only keeps the feed rate constant for
inside machining operations. The feed rate will not be adjusted for
outside machining of circular arcs.
If you program M109 or M110 with a number > 200
before calling a machining cycle, the adjusted feed
rate will also be effective for circular contours within
these machining cycles. The initial state is restored after
finishing or canceling a machining cycle.
Effect
M109 and M110 become effective at the start of the block. M109
and M110 can be canceled with M111.
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022
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