Axial Recessing (Cycle 871, Din/Iso: G871); Application; Roughing Cycle Run - HEIDENHAIN TNC 640 User Manual

12
12.25 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 For the first full recess, the TNC moves the tool at the reduced
feed rate Q511 to the depth of the plunge + allowance.
2 The TNC retracts the tool at rapid traverse.
3 The TNC performs a stepover of the value Q510 x tool width
(Cutwidth).
4 The TNC then recesses again, this time with the feed rate Q478
5 The TNC retracts the tool as per parameter Q462
6 The TNC cuts the area between the starting position and the
end point by repeating steps 2 through 4
7 As soon as the slot width has been achieved, the TNC positions
the tool at rapid traverse back to the cycle starting point.
450
Cycles: Turning | AXIAL RECESSING
(Cycle 871, DIN/ISO: G871)
HEIDENHAIN | User's manual for cycle programming | 10/2017