LinuxCNC G89 Boring Cycle, Dwell, Feed Out

G89 is a canned boring cycle. It feeds the Z axis to the programmed depth at the current feed rate, dwells for P seconds, then retracts at the feed rate to clear Z. It is programmed with position and R retract values, and L can repeat the cycle.

Source checked17/17 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G89
Group	Canned Cycles
Syntax	G89 (X- Y- Z-) or (U- V- W-) R- L- P-
Dialect	LinuxCNC

Parameters

Name	Description	Data type
X
Y
Z
U
V
W
R	Retract position along the axis perpendicular to the selected plane.
L	Optional number of repeats; L=0 is not allowed.	integer
P	Dwell time in seconds.	number

Study notes

Canned cycles are performed relative to the currently selected plane; most descriptions assume the XY plane.
For the UVW plane family, substitute U, V, W for X, Y, Z in the cycle instructions.
Rotary axis words are not allowed in canned cycles.
The R number is always sticky; L is not sticky.
Preliminary motion includes a rapid move parallel to the active plane to the programmed location and a rapid move to the R position when the current Z position is below R.

Safety

It is an error if all axis words are missing, axis words from different groups are used together, a required P number is negative, L does not evaluate to a positive integer, rotary axis motion is used, inverse time feed rate is active, or cutter compensation is active.
If the XY plane is active and the Z number is missing while the same canned cycle was not already active, it is an error; it is also an error if R is less than Z.