Siemens Sinumerik 840D sl Programming Manual page 105

1. The tool is traversed with the programmed feedrate.
2. The retraction velocity can be affected with GUD7 _ZSFI[2].
Figure 4-17
Deep hole tapping with chip breakage/removal
After positioning along the X and Y axes, there is a traversing movement at rapid traverse to
point R. The machining is done from point R onwards with a cutting depth Q (cutting depth
per cutting feedrate). Finally, the tool is retracted by the distance d. If a value not equal to
100% is specified in GUD7 _ZSFI[2], it can be specified whether the retraction is overlaid or
not. The spindle stops as soon as point Z is reached; the direction of rotation is finally
reversed and a retraction is executed. The retraction path d is set in GUD7 _ZSFR[1].
Note
If 0 is specified in _ZSFR[1], the default setting of 1 mm or 1 inch is effective for the
retraction distance.
If 0 mm or 0 inch is to be specified, a value less than the travel triggering should be
specified.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
Deep hole tapping with chip breakage (GUD7 _ZSFI[1] = 3)
Additional functions
4.1 Program supporting functions
105