Axial Recessing (Cycle 870, Din/Iso: G870); Application; Roughing Cycle Run - HEIDENHAIN TNC 640 User Manual

12
12.27 AXIAL RECESSING
(Cycle 870, DIN/ISO: G870)

Application

This cycle enables you to axially cut in slots of any form (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. If the Z coordinate of the starting point is less than
the contour starting point, the TNC positions the tool in the Z
coordinate to the contour starting point and begins the cycle there.
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.
458
Cycles: Turning | AXIAL RECESSING
(Cycle 870, DIN/ISO: G870)
HEIDENHAIN | User's manual for cycle programming | 10/2017