G38.2, G38.3 - Probe target

1.1.0 calibration Probe towards a workpiece and stop on contact. G38_PROBE_TARGET


The Probe Target commands are used to probe towards a workpiece and determine its precise position. The Z endstop doubles as the probe for these commands. You might, for example, use a grounded metal workpiece, with a metal probe spliced into the Z endstop circuit.

  • G38.2 probes towards a target and stops on contact, signaling an error if it reaches the target position without triggering the Z endstop.
  • G38.3 probes towards a target and stops on contact. No error is given if it fails to trigger the Z endstop.

These commands use the current homing feedrate, by default.


These commands require G38_PROBE_TARGET.


G38.2 [F < rate >] [X < pos >] [Y < pos >] [Z < pos >]


[F < rate >]

Feedrate for the move

[X < pos >]

Target X

[Y < pos >]

Target Y

[Z < pos >]

Target Z