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17 Canned Cycles for Drilling
141
Fig. 17.1.1-1
17.1 Detailed Description of Canned Cycles
17.1.1 High Speed Peck Drilling Cycle (G73)
The variables used in the cycle are
G17 G73 X
p
__ Y
p
__ Z
p
__ R__ Q__ E__ F__ L__
G18 G73 Z
p
__ X
p
__ Y
p
__ R__ Q__ E__ F__ L__
G19 G73 Y
p
__ Z
p
__ X
p
__ R__ Q__ E__ F__ L__
The operations of the cycle are
1. rapid-traverse positioning
2. -
3. rapid-traverse movement to point R
4. -
5. drilling as far as the point Z, with feed F
6. -
7. with G99, retraction to point R, in rapid traverse
8. -
9. with G98, retraction to the initial point, in rapid traverse
10. -
Description of drilling operation 5 is as follows:
– drilling the cut-in depth specified at address Q in the workpiece, with feed,
– rapid-traverse retraction by the distance specified at address E or in parameter RETG73,
– drilling cut-in depth Q again, reckoned from the end point of the previous cut-in,
– rapid-traverse retraction at the value specified at address E.
The above procedure is carried on as far as the bottom point specified at address Z.