HEIDENHAIN SW 548328-05 - Manual (Page 263)

HEIDENHAIN MANUALplus 620 263
4.6 Thr
ead and under
c
ut cy
cles
Type of machining for technology database access: thread cutting
Parameter combinations for the taper angle:
 X1/Z1, X2/Z2
 X1/Z1, Z2, W
 Z1, X2/Z2, W
Cycle run
1 Calculate the proportioning of cuts
2 Move to thread starting point X1, Z1.
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
GH Type of offset
 0: Without offset
 1: From left
 2: From right
 3: Alternately left/right
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