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17 Canned Cycles for Drilling
153
Fig. 17.1.12-1
17.1.12 Boring Cycle/Back Boring Cycle (G87)
The cycle will be performed in two different ways.
A. Boring Cycle, Manual Operation at Bottom Point
Unless the machine is provided with the facility of spindle orientation (parameter ORIENT1=0), the
control will act according alternative "A".
The variables used in the cycle are
G17 G87 X
p
__ Y
p
__ Z
p
__ R__ F__ L__
G18 G87 Z
p
__ X
p
__ Y
p
__ R__ F__ L__
G19 G87 Y
p
__ Z
p
__ X
p
__ R__ F__ L__
The spindle must be started in 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.
– 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 rapid-traverse retraction to point R
8.
with G99, spindle re-started (M3)
9.
with G98, START followed by rapid-traverse retraction to the initial point
10.
with G98, spindle re-started (M3)