HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 294)

294 Cycles: Turning
13.7 TURN, L
O
NGITUDIN
AL PLUNGE (Cy
c
le 813)
13.7 TURN, LONGITUDINAL
PLUNGE (Cycle 813)
Application
This cycle enables you to run longitudinal turning of shoulders with
plunge elements (undercuts).
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 start
diameter Q491 is larger than the end diameter Q493, the cycle runs
outside machining. If the start diameter Q491 is less than the end
diameter Q493, the cycle runs inside machining.
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 Q492
CONTOUR START IN Z
, the TNC positions the tool in the Z coordinate to
set-up clearance and begins the cycle there.
In undercutting the TNC runs the infeed with feed rate Q478. The
return movements are then each at set-up clearance.
1 The TNC runs a paraxial infeed motion at rapid traverse. The infeed
value is calculated by the TNC with Q463 MAX. CUTTING DEPTH.
2 The TNC cuts the area between the starting position and the end
point in longitudinal direction at the defined feed rate Q478.
3 The TNC returns the tool at the defined feed rate by one infeed
value.
4 The TNC positions the tool back at rapid traverse to the beginning
of cut.
5 The TNC repeats this process (1 to 4) until the final contour is
completed.
6 The TNC positions the tool back at rapid traverse to the cycle
starting point.