December 2001 The Control Loop 6 – 119
Feed rate
smoothing
Fluctuations in feed rate sometimes occur during execution of NC programs
consisting of short straight-line segments. MP7620 bit 6 smoothes the feed-
rate. However, it also reduces it somewhat.
MP7620 Feed rate override and spindle speed override
Input: Bit 6 – Feed-rate smoothing
0: Not active
1: Active
Tolerance
consideration with
M128
During program run with M128 the head dimensions are also included in the
tolerance consideration (MP1096, Cycle 32). This means that the control tries
to observe the tolerance, taking the head dimensions into account. As a result,
the tolerance is reduced, which leads to a reduction of the feed rate and might
cause the rotary axis to jerk.
To switch off the consideration of the head dimensions for rotary axes with
M128:
7
77
7 Enter bit 4 = 1 in MP7682.
MP7682 Machine parameter with multiple function
Format: %xxxxx
Input: Bit 4 – Tolerance of rotary axes with M128
0: With consideration of head dimensions
1: Without consideration of head dimensions
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