HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 301)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 301
4.1
9
Thr
ead cy
cles
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: Constant mach. X-section
The control reduces the cutting depth after each infeed to
achieve a consistent chip cross section and removal rate.
1: Constant infeed
The control uses the same cutting depth for each infeed without
exceeding the maximum infeed I.
2: EPL with distribution of cuts
The control uses the thread pitch F1 and the constant shaft speed
S to calculate the cutting depth for a constant infeed. If the thread
depth is not a multiple of the cutting depth, the control uses the
depth of the remaining cut 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 without distribution of cuts
The control uses the thread pitch F1 and the constant shaft speed
S to calculate the cutting depth for a constant infeed. If the thread
depth is not a multiple of the cutting depth, the control uses the
depth of the remaining cut for the first infeed. All subsequent
infeeds are constant and correspond to the calculated cutting
depth.
4: MANUALplus 4110
The control performs the first infeed with the maximum infeed 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. The cutting depth decreases with each
infeed since the current number of cuts is incremented by 1 with
each infeed. If, as a result, the remaining cut depth R falls below
the value defined in R, the control uses the value from R as the
new constant cutting depth! If the thread depth is not a multiple
of the cutting depth, the control performs the last cut to the final
depth.
5: Constant infeed (4290)
The control uses the same cutting depth for each infeed; the
cutting depth corresponds to the maximum infeed I. If the thread
depth is not a multiple of the cutting depth, the control uses the
depth of the remaining cut for the first infeed.