Loss of z axis.

Craigylad86

Hi first time post.
I have been using a duet 2 on an open build CNC router.
I have had this for a few years now and over that time I have had and fixed a few issue by trial and error and guidance from forums such as this.
But I'm really stuck on this one.
I have hunches as to what it may be maybe someone can confirm...

The z axis started to play up by missing some steps and eventually juddering up down and in opposite directions as I was controling.

I have since tested all axis with home deactivated all but z worked.
I have now tested the actual Moto by swapping bthe connection from X axis to z motor.
This has confirmed that the Motor is in good working order..

I have checked the duet board and all seems to look ok. No fuses blown or loose cables.

I'm now beginning to think it may be the board itself.

Is there anything else I can test to confirm this.

All help will be kindly received.
Thank you undefined

peter247

@craigylad86 if you get juddering from a stepper motor that mean you have lost a pole .
I would say check the cables again and look at the stepper , I've had a stepper motor die because of bad soldering inside the motor.
Try removing the cable from the board and checking for the poles with a multimeter ?

Craigylad86

@peter247 thank you Peter. To check the motor i have connected the X axis to the z motor and selected the X axis on the dashboard.
Doing this makes the z motor work as it's commanded

peter247

@craigylad86 That is my second idea swap axis which checks the cable and motor .
Does look to be the board ?
did you just swap the cables on the board ?

Craigylad86

@peter247
Yes..
So I swapped the Z and X axis on the board.
This provide the the opposite results as the issue I was having.
X on the board would control Z motor
Z on the board would not move X motor

peter247

@craigylad86 I would say logically if you swap the 2 plugs on the board and Z now works but X doesn't I would say that rules out the cables and motor ?

Would not move or get a judder ?

Craigylad86

@peter247
that's what I have concluded.
Z on the board does not move X motor at all, not even a juder.
In fact there is no resistance in the motor, I can manually move the axis.
This is true when the board z is connected to eather X or z motor.

peter247

@craigylad86 if you haven't changed the config.g file and not configured Z, I would say you have killed the Z driver on the board ?

Craigylad86

@peter247
All the axis failed to home. So i opened the program.
The only reconfigure I have done is to open all axis from not having to home before activity. As described when setting up and fault finding.

Think it's m1 to a m0. Or similar can't recal without looking.

If the z on the board is dead
What can I do?

Is it a board replacement situation?

jay_s_uk

@craigylad86 post an output of M115 and a copy of your config. If you're not using E0 or E1, you can map Z to one of those

peter247

@craigylad86 As jay-s-uk says you can use E0 or E1 as a Z axis .
This is my mapping M584 X0 Y1 Z2:3 E4 , which makes Z and E0 both Z axis motors .

Craigylad86

@peter247 ok so I have limited knowledge on computers and part names I'm learning as I go along.
I'm assuming e0 or e1 to be other ports.
Is this the one directly underneath the z on the board?
Or the one at the end of the row?

Craigylad86

@craigylad86 and you want me to change the commands to controle z to go through port e0 and use that as a route.
So I have to then reconfigure a section of the program.

peter247

@craigylad86

https://duet3d.dozuki.com/Wiki/Duet_Wiring_Diagrams

E1 is next to the extruder heater , so you want to jump from the 2 plug Z plugs to the other side.

also you need to do a configuring ?

M569 P4 S1 to what P2 was and M584 X0 Y1 Z3 E4

So your first extruder is now the Z and E1 your first extruder.

Craigylad86

@peter247 ok that diagram is brilliant thanks.
I have z2 available
And e1 available.
Would the z2 also be affected by my malfunctioning z chip?

Should I just go straight to e1?

peter247

@craigylad86 said in Loss of z axis.:

I have z2 available
And e1 available.

You mean you have only 1 plug in Z2 and the other are jumper ?
the 2 Z plugs are the same driver but the 2 plugs are wired in series.

yes move z to e1

also you need to do a configuring ?

; Drives
M569 P0 S1 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P2 S? ****** remove this
M569 P3 S0 ; extruder
M569 P4 S? ****** add this extruder E1 is now Z

? = what s was before , us you direction setting NOT MINE.

M584 X0 Y1 Z4 E3

Craigylad86

@peter247
My drives
Same as your except my m584
My reads

M584 x0 y1:3 z2; apply drive mapping to axis

Craigylad86

@peter247
Good news guys..

I have now altered the config.

As follows

M569 P0 S0 ; Drive goes forwards
M569 P1 S1 ; Drive goes forwards
M569 P2 S0 ; Drive goes forwards
M569 P3 S1 ; Drive goes forwards
M584 X0 Y1 Z4 E3

I have now a functional z axis. 🥳
But I have a new problem.
I have 2 y axis stepper motors.
Since I have change this config I have only 1 working.

Any suggestions please
Do I change the m584 part so it's y2?
Or is that something different?

jay_s_uk

@craigylad86 said in Loss of z axis.:

M584 X0 Y1 Z4 E3

M584 X0 Y1:3 Z4 E2 (unless you're on 3.3.0 where you can omit the E entirely)

Craigylad86

@jay_s_uk
absolutely Bluddy brilliant..

I am now up and running again..

Thank you so much both of you