Question Z axis stop turn.

The Z axis stoped turning suddenly.
My first thought was that any screw has loosened on the axel, but no.
I´m using UCCNC and when I "quick jog" shift+jog it turn for some reason.
Could it depend on any of the three cables that have gone off?

/Mika+

This is a video of what happening.



/Mika+

The motor has no power, and I can stop it with my fingers without any problems.

No one has any idea what it might be wrong ???

/Mika+

Hi Mikath,

It looks very much as though only one of the two stepper coils is being driven. Three possibilities for this situstion :-

1) Fractured wire or loose connection in the wiring loom. (Most likely)

2) Open circuit winding inside stepper motor. (Not very likely - low resistance and thick wire)

3) Faulty stepper driver chip. (Unlikely for only one channel to fail - usually all or nothing)

Given that it is likely to be a fractured wire, I guess you will have hours of fun unwiring the gantry.

Peter

Thanks for your reply.
Initially, I'll try to change the X or Y axis to Z to see that there is no error on the PCB.

My fear is to rewire the gantry...

/Mika+

One other thing I noticed is that the motor has a very high frequency of noise, the other motorss are completely silent.

/Mika+

Now I have changed the X motor to Z on the PCB and it work like a charm.
I think it´s a fractured wire.

/Mika+

Hi Mika,

Glad you've probably found the problem.

Don't envy you having to unwire the gantry to find the culprit. Good luck!

Peter.

I cut the cables and replaced with new ones and now all the axis work.
It does not look so nice at the moment, but I can fix it when I have new parts.

/Mika+