HEIDENHAIN TNC 620 User Manual page 89

Deepened starting point Q379 (incremental with
respect to the workpiece surface): Starting position
for actual drilling operation. The TNC moves at the
feed rate for pre-positioning from the set-up
clearance above the workpiece surface to the set-up
clearance above the deepened starting point. Input
range 0 to 99999.9999
Feed rate for pre-positioning Q253: Defines the
traversing speed of the tool when returning to
the plunging depth after having retracted for chip
breaking (Q256). This feed rate is also effective
when the tool is positioned to a deepened starting
point (Q379 not equal to 0). Entry in mm/min. Input
range 0 to 99999.9999 alternatively FMAX, FAUTO
Feed rate for retraction Q208: Traversing speed
of the tool in mm/min when retracting after the
machining operation. If you enter Q208 = 0, the
TNC retracts the tool at the feed rate Q206. Input
range 0 to 99999.9999, alternatively FMAX,FAUTO
Depth reference Q395: Select whether the entered
depth is referenced to the tool tip or the cylindrical
part of the tool. If the TNC is to reference the depth
to the cylindrical part of the tool, the tip angle of the
tool must be defined in the T ANGLE column of the
TOOL.T tool table.
0 = depth in relation to the tool tip
1 = depth in relation to the cylindrical part of the tool
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
UNIVERSAL PECKING (Cycle 205)
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