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2
Using Fixed Cycles
2.2
Program defaults for cycles
Global data for drilling operations
Retraction rate for chip breaking: Value by which the TNC
retracts the tool during chip breaking
Dwell time at depth: Time in seconds that the tool remains at
the hole bottom
Dwell time at top: Time in seconds that the tool remains at the
set-up clearance
The parameters apply to the drilling, tapping and
thread milling cycles 200 to 209, 240, 241 and 262 to
267 .
Global data for milling operations with pocket
cycles 25x
Overlap factor: The tool radius multiplied by the overlap factor
equals the lateral stepover
Climb or up-cut: Select the type of milling
Plunging type: Plunge into the material helically, in a
reciprocating motion, or vertically
The parameters apply to milling cycles 251 to 257 .
Global data for milling operations with contour
cycles
Set-up clearance: Distance between tool face and workpiece
surface for automated approach of the cycle start position in the
tool axis
Clearance height: Absolute height at which the tool cannot
collide with the workpiece (for intermediate positioning and
retraction at the end of the cycle)
Overlap factor: The tool radius multiplied by the overlap factor
equals the lateral stepover
Climb or up-cut: Select the type of milling
The parameters apply to SL cycles 20, 22, 23, 24 and
25.
52
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016
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