LinuxCNC G82 Drilling Cycle, Dwell: syntax, parameters and example

Specification

1 source

Name	Data type	Description
X	real	Destination X position.
Y	real	Destination Y position.
Z	real	Destination Z position at the bottom of the hole.
U	real	Destination U position when a UVW plane is active.
V	real	Destination V position when a UVW plane is active.
W	real	Destination W position when a UVW plane is active.
R	real	Retract position along the axis perpendicular to the selected plane.
L	integer	Number of times to repeat the cycle (positive integer).
P	real	Dwell time in seconds at the bottom of the hole.

Canned cycles G81 through G89 are performed with respect to the currently selected plane; in the XY plane the cycle acts along Z, and in the UV plane U, V and W replace X, Y and Z.
Rotary axis words are not allowed in canned cycles, and XYZ words cannot be mixed with UVW words on the same cycle line.
R is the retract position along the axis perpendicular to the selected plane and is always a sticky number; X, Y and Z are also sticky within a repeated cycle.
Preliminary motion moves the Z axis to the R position with a rapid only if the current Z is below R, and this happens once regardless of L.
L gives the number of repeats; in incremental mode X and Y offsets accumulate across repeats while R and Z do not change.
G98 retracts to the Z position from before the series of cycles started, G99 retracts to the R position; switching between cycle modes does not reset the G98 plane.
G80 or any other modal group 1 motion code cancels the cycle.
Example: G90 G82 G98 X4 Y5 Z1.5 R2.8 P2 drills at X4 Y5, feeds to Z1.5, dwells 2 seconds, then rapids clear.