Simple Axial Recessing (Cycle 851, Din/Iso: G851); Application; Roughing Cycle Run - HEIDENHAIN TNC 640 User Manual

12
12.19 SIMPLE AXIAL RECESSING
(Cycle 851, DIN/ISO: G851)

Application

This cycle enables you to recess right-angled slots in traverse
direction. With recess turning, a recessing traverse to plunging
depth and then a roughing traverse is alternatively machined. The
machining process thus requires a minimum of retraction and
infeed movements.
You can use the cycle either for roughing, finishing or complete
machining. Turning is run paraxially with roughing.
The cycle can be used for inside and outside machining. If the tool
is outside the contour to be machined when the cycle is called, the
cycle runs outside machining. If the tool is inside the contour to be
machined, the cycle runs inside machining.

Roughing cycle run

The TNC uses the tool position as cycle starting point when a cycle
is called. The cycle processes the area from the cycle starting point
to the end point defined in the cycle.
1 From the cycle starting point, the TNC recesses until the first
plunging depth.
2 The TNC cuts the area between the starting position and the
end point in traverse direction at the defined feed rate Q478.
3 If the input parameter
elements are machined at the programmed feed rate for
plunging.
4 If only one machining direction Q507=1 was specified in
the cycle, the TNC retracts the tool by the set-up clearance,
positions the tool back at rapid traverse and approaches the
contour again with the defined feed rate. With machining
direction Q507=0, infeed is on both sides.
5 The tool recesses to the next plunging depth.
6 The TNC repeats this process (2 to 4) until the slot depth is
reached.
7 The TNC returns the tool to set-up clearance and machines a
recessing traverse on both side walls.
8 The TNC positions the tool back at rapid traverse to the cycle
starting point.
426
Q488 is defined in the cycle, plunging
Cycles: Turning | SIMPLE AXIAL RECESSING
(Cycle 851, DIN/ISO: G851)
HEIDENHAIN | User's manual for cycle programming | 10/2017