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17 Canned Cycles for Drilling
17.1.14 Boring Cycle (Dwell on the Bottom Point, Retraction with Feed) (G89)
Fig.
The variables used in the cycle are
G17 G89 Xp__ Yp__ Zp__ R__ P__ F__ L__
G18 G89 Zp__ Xp__ Yp__ R__ P__ F__ L__
G19 G89 Yp__ Zp__ Xp__ R__ P__ F__ L__
The operations of the cycle are
1.
2.-
3.
4.-
5.boring as far as the bottom point, with feed F
6.dwelling with the value specified at address P
7.retraction to point R, with feed F
8.-
9.with G98, rapid-traverse retraction to the initial point
10.-
Except for dwelling, the cycle is identical with G85.
17.2 Notes to the use of canned cycles
–The drilling cycle will be executed in cycle mode provided a block without code G contains one of the addresses
Xp, Yp, Zp, or R
Otherwise, the drilling cycle will not be executed.
–With dwell G04 P programmed in cycle mode, the command will be executed in conformity with P programmed, but the cycle variable of dwell will not be deleted and will not be
–The values of I, J, K, Q, E, P have to be specified in a block, in which drilling is also performed, or else the values will not be stored.
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