HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 302)

302 Cycles: Turning
13.9 TURN CONT
OUR, L
ONG
ITUDINAL (Cy
c
le 81
0)
13.9 TURN CONTOUR,
LONGITUDINAL (Cycle 810)
Application
This cycle enables you to run longitudinal turning of workpieces with
any turning contours. The contour description is in a subprogram.
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 starting
point of the contour is larger than the end point of the contour, the
cycle runs outside machining. If the starting point of the contour is
less than the end point of the contour, 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 the contour
starting point, the TNC positions the tool in the Z coordinate to set-up
clearance and begins the cycle there.
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 machines the area between the starting position and the
end point in longitudinal direction. The longitudinal cut is run
paraxially with 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.