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docs: eddy homing correction macro

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Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
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Timofey Titovets 2026-02-01 17:00:07 +01:00
parent 558f01b4b3
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34
docs/Eddy_Probe.md
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@ -4,8 +4,10 @@ This document describes how to use an
[eddy current](https://en.wikipedia.org/wiki/Eddy_current) inductive
probe in Klipper.
Currently, an eddy current probe can not be used for Z homing. The
sensor can only be used for Z probing.
Currently, an eddy current probe can not precisely home Z (i.e., `G28 Z`).
The sensor can precisely do Z probing (i.e., `PROBE ...`).
Look at the [homing correction](Eddy_Probe.md#homing-correction-macros)
for further details.
Start by declaring a
[probe_eddy_current config section](Config_Reference.md#probe_eddy_current)
@ -66,6 +68,34 @@ surface temperature or sensor hardware temperature can skew the
results. It is important that calibration and probing is only done
when the printer is at a stable temperature.
## Homing correction macros
Because of current limitations, homing and probing
are implemented differently for the eddy sensors.
As a result, homing suffers from an offset error,
while probing handles this correctly.
To correct the homing offset.
One can use the suggested macro inside the homing override or
inside the starting G-Code.
[Force move](Config_Reference.md#force_move) section
have to be defined in the config.
```
[gcode_macro _RELOAD_Z_OFFSET_FROM_PROBE]
gcode:
{% set Z = printer.toolhead.position.z %}
SET_KINEMATIC_POSITION Z={Z - printer.probe.last_probe_position.z}
[gcode_macro SET_Z_FROM_PROBE]
gcode:
{% set METHOD = params.METHOD | default("automatic") %}
PROBE METHOD={METHOD}
_RELOAD_Z_OFFSET_FROM_PROBE
G0 Z5
```
## Tap calibration
The Eddy probe measures the resonance frequency of the coil.