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17 Canned Cycles for Drilling
155
Fig. 17.1.13-1
17.1.13 Boring Cycle (Manual Operation on the Bottom Point) (G88)
The variables used in the cycle are
G17 G88 X
p
__ Y
p
__ Z
p
__ R__ P__ F__ L__
G18 G88 Z
p
__ X
p
__ Y
p
__ R__ P__ F__ L__
G19 G88 Y
p
__ Z
p
__ X
p
__ R__ P__ F__ L__
The spindle must be given rotation M3 when the cycle is started.
The operations of the cycle are
1. rapid-traverse positioning in the selected plane
2. -
3. rapid-traverse movement to point R
4. -
5. boring as far as the bottom point with feed F
6. – dwell with value P
– spindle stop (M5)
– the control assumes STOP state (M0), from which the operator can get in one of
the manual movement modes (JOG, INCREMENTAL JOG, or HANDLE)
and operate the machine manually, for example retract the tool from the side
of the hole then remove the tool from the hole. After returning AUTO mode
machining can be continued by START.
7. with G99, START followed by retraction to point R (rapid traverse)
8. with G99, spindle re-started (M3)
9. with G98, rapid-traverse retraction to the initial point
10. with G98, spindle re-started (M3)
The cycle is the same as case "A" of G87 but dwelling before the spindle stop.