HEIDENHAIN SW 68894x-02 - Manual (Page 264)

264 Teach-in mode
4.6
Thr
ead
and
under
cut
cy
cles
Type of machining for technology database access: thread cutting
Cycle run
1 Calculate the proportioning of cuts
2 Start the first thread groove at starting point Z
3 Move at the programmed feed rate to the contour end point Z2
4 Return on paraxial path and approach for next thread groove
5 Repeat 3 and 4 for all thread grooves
6 Approach for next pass, taking the reduced cutting depth and the
feed angle A
into account
7 Repeat 3 to 6 until no. threads D and depth U are reached
8 Move to the tool change point according to the G14 setting
GV Type of infeed
 0: Constant mach. X-section
 1: Constant infeed
 2: W/ remaining cutting (with distribution of remaining
cuts)
 3: W/o remaining cutting (without distribution of
remaining cuts)
 4: Same as MANUALplus 4110
 5: Constant infeed (same as 4290)
 6: Constant with distribute. (same as 4290)
A Approach (infeed) angle (range: –60° < A < 60°; default
30°)
 A<0: Infeed on left thread flank
 A>0: Infeed on right thread flank
R Remaining cutting depth only with GV=4 (default 1/100
mm)
E Variable thread pitch (e.g. for manufacturing spiral
conveyors or extrusion shafts)
Q No. no load (number of dry runs)
IC Number of cuts—the infeed is calculated from IC and U.
Usable with:
 GV=0: Constant chip cross section
 GV=1: Constant infeed
MT M after T: M function that is executed after the tool call T
MFS M at beginning: M function that is executed at the
beginning of the machining step
MFE M at end: M function that is executed at the end of the
machining step
WP Displays which workpiece spindle is used to process the
cycle (machine-dependent)
 Main drive
 Opposing spindle for rear-face machining