HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 380)

Cycles: Turning
13.25 AXIAL RECESSING
(Cycle 871, DIN/ISO: G871)
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TNC 640 | User's Manual Cycle Programming | 3/2014
13.25 AXIAL RECESSING
(Cycle 871, DIN/ISO: G871)
Application
This cycle enables you to axially cut in right-angled slots (face
recessing).
You can use the cycle either for roughing, finishing or complete
machining. Turning is run paraxially with roughing.
Roughing cycle run
The TNC uses the tool position as cycle starting point when a cycle
is called. The cycle processes only the area from the cycle starting
point to the end point defined in the cycle.
1 The TNC runs a paraxial infeed motion at rapid traverse (lateral
infeed = 0.8 cutting width).
2 The TNC cuts the area between the starting position and the
end point in radial direction at the defined feed rate
Q478.
3 The TNC positions the tool back at rapid traverse to the
beginning of cut.
4 The TNC repeats this process (1 to 3) until the slot width is
reached.
5 The TNC positions the tool back at rapid traverse to the cycle
starting point.
Finishing cycle run
1 The TNC positions the tool at rapid traverse to the first slot side.
2 The TNC finishes the side wall of the slot at the defined feed
rate
Q505.
3 The TNC finishes half the slot width at the defined feed rate.
4 The TNC returns the tool at rapid traverse.
5 The TNC positions the tool at rapid traverse to the second slot
side.
6 The TNC finishes the side wall of the slot at the defined feed
rate
Q505.
7 The TNC finishes half the slot width at the defined feed rate.
8 The TNC positions the tool back at rapid traverse to the cycle
starting point.