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17 Canned Cycles for Drilling
143
Fig. 17.1.3-1
17.1.3 Fine Boring Cycle (G76)
Cycle G76 is only applicable when the facility of spindle orientation is incorporated in the machine-
tool. In this case parameter ORIENT1 is to be set to 1, otherwise message 3052 ERROR IN G76 is
returned.
Since, on the bottom point, the cycle performs spindle orientation and recesses the tool from the
surface with the values specified at I, J and K, the part will not be scratched when the tool is
withdrawn.
The variables used in the cycle are
G17 G76 X
p
__ Y
p
__ I__ J__ Z
p
__ R__ P__ F__ L__
G18 G76 Z
p
__ X
p
__ K__ I__ Y
p
__ R__ P__ F__ L__
G19 G76 Y
p
__ Z
p
__ J__ K__ X
p
__ R__ P__ F__ L__
Command M3 has to be issued prior to starting the cycle.
The operations of the cycle:
1. rapid-traverse positioning in the selected plane
2. -
3. rapid-traverse movement as far as point R
4. -
5. boring as far as the point Z, with feed F
6. – dwell with the value specified at address P
– spindle orientation (M19)
– rapid-traverse receding of the tool with values I, J, K in the selected plane
7. with G99, rapid-traverse retraction as far as point R
8. with G99,
– rapid-traverse retraction of the tool in the selected plane, opposite to the values
specified at I, J, K
– spindle re-started in direction M3
9. with G98, rapid-traverse retraction to the initial point
10. with G98,
– rapid-traverse retraction of the tool in the selected plane, opposite to the values
specified at I, J, K