Siemens SINUMERIK 840D, Operating Manual, Page: 358 / 610

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Milling
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Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
8.4.3 Groove (CYCLE930)
Function
You can use the "Groove" cycle to manufacture symmetrical and asymmetrical grooves on
any straight contour elements.
You can machine outer or inner grooves in the longitudinal or transverse directions. Use the
"Groove width" and "Groove depth" parameters to determine the shape of the groove. If a
groove is wider than the active tool, it is machined in several cuts. The tool is moved by a
maximum of 80% of the tool width for each groove.
You can specify a finishing allowance for the groove base and the flanks; roughing is then
performed down to this point.
The dwell time between recessing and retraction is stored in a setting data element.
Machine manufacturer
Please also refer to the machine manufacturer's specifications.
Approach/retraction during roughing
Infeed depth D > 0
1.
The tool first moves to the starting point calculated internally in the cycle at rapid traverse.
2. The tool cuts a groove in the center of infeed depth D.
3. The tool moves back by D + safety clearance with rapid traverse.
4. The tool cuts a groove next to the first groove with infeed depth 2 · D.
5. The tool moves back by D + safety clearance with rapid traverse.
6. The tool cuts alternating in the first and second groove with the infeed depth 2 · D, until
the final depth T1 is reached.
Between the individual grooves, the tool moves back by D + safety clearance with rapid
traverse. After the last groove, the tool is retracted at rapid traverse to the safety
distance.
7. All subsequent groove cuts are made alternating and directly down to the final depth T1.
Between the individual grooves, the tool moves back to the safety distance at rapid
traverse.
Approach/retraction during finishing
1. The tool first moves to the starting point calculated internally in the cycle at rapid traverse.
2. The tool moves at the machining feedrate down one flank and then along the bottom to
the center.
3. The tool moves back to the safety distance at rapid traverse.
4. The tool moves at the machining feedrate along the other flank and then along the bottom
to the center.
5. The tool moves back to the safety distance at rapid traverse.