HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 340)

340 Cycles: Turning
13.1
9
AXIAL RECESSING (Cy
c
le 871)
13.19 AXIAL RECESSING (Cycle 871)
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 tool edge width).
2 The TNC machines the area between the starting position and 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.