Safety first: Use the E-stop, unplug spindle/machine power before touching tools, switches or couplers, and keep hands out of axis travel. Never bypass a hard-limit switch to run a cutting job; do not loosen a powered spindle or jog an axis into its physical end.
Model and version covered
Genmitsu 3018-PROVer V2 with GRBL-compatible controller. Check board marking and firmware before applying GRBL commands; the older 3018-PROVer and V2 Lite do not necessarily have identical connectors.
Version check: Confirm controller, GRBL firmware and actual limit/probe connections before changing parameters or running automated motion.
DIAGNOSE THE CAUSE · APPLY THE FIX · CONFIRM THE RESULT
Find the cause and fix it
Jump to your symptom: 01 · Probe descends without detecting touch02 · Probe stops but zero is wrong03 · Probe still fails with clean electrical circuit and correct software
01
Probe descends without detecting touch
HOW TO CHECK & CORRECT THIS CAUSE
- STOP before tool hits metal.
- With power safe, check probe plate lead to Probe port, clip to clean conductive bit and that clip/plate are not shorted before contact.
- Verify software reports probe input change with deliberate safe contact before starting a downward probing move.
How to tell it is fixed: Z-probe stops immediately when tool touches plate.
02
Probe stops but zero is wrong
HOW TO CHECK & CORRECT THIS CAUSE
- Measure actual thickness of YOUR probe plate and enter its verified offset in Candle/probe macro for this setup.
- Remove probe plate after setting origin.
How to tell it is fixed: Z0 corresponds to actual work surface on a controlled test.
03
Probe still fails with clean electrical circuit and correct software
HOW TO CHECK & CORRECT THIS CAUSE
- Replace damaged probe leads/plate or faulty probe input through V2-matched repair.
- Do not let GRBL plunge continue based on guessed offsets.
How to tell it is fixed: Repeated contact detection works at safe height.
Source and model restrictions
Technical baseline: Manufacturer guide or model manual ↗