LinuxCNC G85

G85 is a LinuxCNC canned cycle for boring or reaming; it can also be used for drilling or milling. After the common preliminary motion, the Z axis feeds to the programmed Z position, retracts at feed rate to the R plane when that plane is lower than the initial Z, and then retracts at traverse rate to clear Z.

Source checked27/27 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G85
Group	canned cycles (G80-G89)
Syntax	G85 (X- Y- Z-) or (U- V- W-) R- L-
Dialect	LinuxCNC

Parameters

Name	Data type	Description
X	real	X-axis position in the selected plane, or increment in incremental distance mode.
Y	real	Y-axis position in the selected plane, or increment in incremental distance mode.
Z	real	Z-axis position or increment along the axis perpendicular to the selected plane when the XY plane is active; the Z number is sticky.
U	real	U-axis word used with UVW-family planes instead of X.
V	real	V-axis word used with UVW-family planes instead of Y.
W	real	W-axis word used with UVW-family planes instead of Z.
R	real	Retract position along the axis perpendicular to the currently selected plane; always sticky.
L	integer	Number of repeats; optional, not sticky, and must evaluate to a positive integer.

Study notes

G85 is part of the G80-G89 canned cycle group in LinuxCNC.
Canned cycles are performed with respect to the currently selected plane, and rotary axis words are not allowed.
The R word is sticky in canned cycles; the L word is optional and is not sticky.
The final retract height is affected by the G98/G99 canned cycle return level setting.