Teach-in | Thread and undercut cycles
5
HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
313
GV parameter: Type of infeed
With the GV parameter, you define the type of infeed for thread
cutting cycles.
The following infeed types are available:
0: Const. mach. X-section – the control reduces the cutting
depth with each infeed so that the chip cross section and
therefore the removal rate remain constant
1: Const. infeed – with each infeed the control uses the same
cutting depth without exceeding the Max. approach I
2: EPL with distrib. of cuts – the control calculates the cutting
depth for constant infeed from the Thread pitch F1 and Shaft
speed constant S. If the multiple of the cutting depth does
not correspond to the Thread depth, the control uses the
Rem. cut depth for the first infeed. With the "distribution of
remaining cuts," the control divides the last cutting depth into
four partial cuts. The first cut is half the calculated cutting depth,
the second is a quarter and the third and fourth each are an
eighth
3: EPL w/o distrib. of cuts – the control calculates the cutting
depth for constant infeed from the Thread pitch F1 and Shaft
speed constant S. If the multiple of the cutting depth does not
correspond to the Thread depth, the control uses the Rem. cut
depth for the first infeed. All subsequent infeeds are constant
and correspond to the calculated cutting depth
4: MANUALplus 4110 – the control executes the first infeed
with the Max. approach I. To determine the subsequent cutting
depths, the control uses the formula gt = 2 * I * SQRT "current
no. of cuts", where gt is the absolute depth. Since the cutting
depth is reduced with each infeed because the current number
of cuts is increased accordingly by the value 1, and if the cutting
depth falls below the value given in Rem. cut depth R, the
control uses the value defined here as the new constant cutting
depth. If the multiple of the cutting depth does not correspond
to the Thread depth, the control executes the last cut at the
final depth
5: Constant infeed (4290) – with each infeed the control uses
the same cutting depth, whereby the cutting depth corresponds
to the Max. approach I. If the multiple of the cutting depth does
not correspond to the Thread depth, the control uses the Rem.
cut depth for the first infeed
6: Const. w/ distrib. (4290) – with each infeed the control uses
the same cutting depth, whereby the cutting depth corresponds
to the Max. approach I. If the multiple of the cutting depth
does not correspond to the Thread depth, the control uses
the Rem. cut depth for the first infeed. With the "distribution
of remaining cuts," the control divides the last cutting depth
into four partial cuts. The first cut is half the calculated cutting
depth, the second is a quarter and the third and fourth each are
an eighth
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