G83 peck drilling cycle perform the drilling operation in multiple pecks, this technique makes deep-hole drilling easy and economical.
Cutting feed is performed intermittently to the bottom of the hole while chips are discharged.
As the drilling is performed to the bottom of the hole with feed in multiple small steps, every time a specified depth is made and then drill retracts, then drill makes the next peck, this operation is repeated again and again until the drill depth is reached.
G83 X... Y... Z... R... Q... F... K...
|X||Hole position in x-axis.|
|Y||Hole position in y-axis.|
|Z||Depth, tool will travel with feed to Z-depth starting from R plane.|
|R||Position of the R plane.|
|Q||Depth of cut for each cutting feed (Peck).|
|K||Number of cycle repetitions (if required).|
Once given in program G83 peck drilling cycle is repeated at every axis movement until G80 is given in program to end peck drilling cycle.
N150 M06 T02 N160 G90 G00 X60 Y28 Z12 S750 M03 N170 G99 G83 X60 Y28 Z-17 Q6 R2 F60 N180 G98 Y12 N190 G91 G80 G28 X0 Y0 Z0 M05 N200 M30
In the above example code first drill is done at X60 Y28 and second at Y12 and then peck drilling is cycle is ended with G80.
6mm pecks are taken to complete total drilling depth of 17mm.
Here is briefly described how G83 peck drilling cycle works,
1- Rapid traverse to X, Y drilling position.
2- Rapid traverse to R-plane.
3- Drilling with feed Q deep.
4- Retraction with Rapid traverse to R-plane.
5- Rapid traverse to Q-d deep (d value is specified in parameters).
6- Drilling with feed Q+d deep.
7- Retraction with Rapid traverse to R-plane
– this whole procedure is repeated until drill reaches Z-depth position,
– then drill is retracted to R-plane or Initial-level depends on G99 or G98 which one is given in program.
G98 G99 Modes
After completing drilling depth the return is made with Rapid feed, the return height can be controlled through using G98 or G99.
G98 Drill will return to the Initial level
G99 Drill will return to R-plane.
G98, G99 can be used multiple times during G83 peck drilling cycle.
N30 G83 X10 Y30 Z-17 Q5 R2 F75 N40 Y10 N50 G98 X30 N60 G99 Y30 N70 X90 N80 Y10 N90 G80
G83 peck drilling cycle, drilling operation can be repeated multiple times. The drilling is repeated K times if K value is given with G83.
Repeat drilling is normally used with G91 Incremental mode, and a good example of repeated drilling is Grid-plate drilling. For working example see G81 drilling cycle.
N10 M06 T1 N20 G90 G00 X12.5 Y10 Z12 S1000 M03 N30 G99 G83 X12.5 Y10 Z-17 R2 Q4 F75 N40 Y30 N50 G98 X57.5 N60 G99 Y10 N70 G91 G80 G28 X0 Y0 Z0 M05 N80 M30