smart.Turn units | Units – Threads
2
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
161
Parameter V: Type of infeed
With the V 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
Remaining cut depth (V=4) 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
Remaining cut depth (V=4) 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. Because the cutting
depth reduces with each infeed due to the current number
of cuts increasing by the value 1 with each infeed, and if the
Remaining cut depth (V=4) R is fallen below, the control uses
the value defined in this 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 where 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
Remaining cut depth (V=4) for the first infeed
6: Const. w/ distrib. (4290) – with each infeed the control uses
the same cutting depth, where 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 Remaining cut depth (V=4) 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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