Problem with Z home with Probe.

Mostly Printed CNC - MPCNC Troubleshooting
1

I have a mistake with home Z features
probe wires are plug to the Z min on the rambo1.4 board

I try to home Z with all existing command : From LCD menu, from repetier controller button and with the gcode G28 Z

all have the same result : Z axis go down for 2mm and then and goes back over the starting position without ever going down to the plate.
I tested the endstop state with the M119 Gcode and the defaut state is open and when the wire touch the probe the state is Triggered…

look at the attached vidéo

[attachment file=85031]

2

Try swapping the wires, so that the clip is the other side of the switch. It also looks like you Z is backwards.

 

Pictures of everything help, full machine, wires, board plug. That zoomed in video is not much to go on.

3

I will give photo tomorow

but machine work fine for cutting and carving job, with LCD motion command the spindle goes up for positive values and Down for negative.

4

ok this morning I open my board box and before to make photos I test something:
I unplug the Zmin Wire on the RAMbo and then when I launch the HomeZ commande the Z axis go down to the work table without stop.
I test the wire with ohm-meter no short circuit. But when I plug the white 6wires extension cable provided with the board it work fine.
Is it possible that the length of the cable is involved?

5

Maybe your tool is grounded, like I said swap the connection.

6

I have swap it but didn’t change any thing.
It work fine if I plug an other cable, my previous cable was 2 wires of 6 wires cable used for the Z stepper motor may be contact with with a motor wire I have to check All the cable’s wires

7

I had same problem. Length of wires of your z-probe is too long, so it triggered by emi. First time i swapped wires so ground was connected to the bit, signal ware to the plate. It helped, but not too much.

So i made electronic probe

[attachment file=85275]

 

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