HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 289)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 289
4.1
7
Cont
our
-based t
u
rn
ing cy
cles
Recessing cycle G870
G870 generates a recess defined by G22-Geo. The Steuerung uses
the tool definition to distinguish between external and internal
machining, or between radial and axial recesses.
Parameters
ID
Auxiliary contour—ID number of the contour to be machined
NS Block number (reference to G22-Geo)
I Oversize for roughing (default: 0)
 I=0: Recess is made in one work step.
 I>0: The first operation is roughing, the second finishing.
E Dwell time (default: time for one spindle revolution)
 If I=0: For every recess
 If I>0: Only for finishing
Calculation of cutting segmentation:
Maximum offset = 0.8 * cutting width
 The tool radius compensation is active.
 An oversize is not taken into account.
Cycle run
1
Calculates the number of cutting passes.
2 Approaches workpiece from starting point for first pass.
 Radial recess: First Z, then X direction
 Axial recess: First X, then Z direction
3 Executes the first cut according to I.
4 Returns at rapid traverse and approaches for next pass.
5 If I=0: Dwells for time E
6 Repeats 3 to 4 until the complete recess has been machined.
7 If I>0: Finish machines the contour