Recessing Cycle G870 - HEIDENHAIN CNC PILOT 640 User Manual

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Recessing cycle G870

G870 generates a recess defined by G22-Geo. The control 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: Starting block no. of contour – reference to G22-Geo
I: Ov.size for roughing (default: 0)
I = 0: Recess is made in one work step
I > 0: The first operation is roughing, the second finishing
E: Delay (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
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DIN/ISO programming | Contour-based turning cycles
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017