Extruder "fighting" itself?

mlbuxbaum

My extruder stepper seems to be fighting itself (grinding and not turning) I have the stepper wired directly to the DUET board and double checked that I have each coil wired together, and that i have those coils wired to the black & green (coil1) and the red & blue(coil2) respectively. Any idea what my issue could be, I am thinking it is a firmware issue.

mlbuxbaum

just checked impedance on the stepper while still connected to the DUET. Coil 1 reads .887MΩ and coil 2 reads 1.2Ω. Think my driver is bad? I checked the stepper motor and both measure the same impedance.

dc42

@mlbuxbaum said in Extruder "fighting" itself?:

just checked impedance on the stepper while still connected to the DUET. Coil 1 reads .887MΩ and coil 2 reads 1.2Ω. Think my driver is bad? I checked the stepper motor and both measure the same impedance.

If coil 1 read .887Mohms than you have an intermittent connection between wherever you touched your multimeter probes and the stepper motor coil.

mlbuxbaum

hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

dc42

@mlbuxbaum said in Extruder "fighting" itself?:

hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

Unlikely unless you have set the acceleration or speed much too high. It sounds like a bad connection, faulty motor or a blown driver. Your reading of .887Mohms definitely means you had a bad connection or a faulty motor at that point. Can you test the driver by connecting a different motor to it, using a different cable?

mlbuxbaum

@dc42 said in Extruder "fighting" itself?:

@mlbuxbaum said in Extruder "fighting" itself?:

hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

Unlikely unless you have set the acceleration or speed much too high. It sounds like a bad connection, faulty motor or a blown driver. Your reading of .887Mohms definitely means you had a bad connection or a faulty motor at that point. Can you test the driver by connecting a different motor to it, using a different cable?

I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

gen2eng

For what it's worth, I've seen two pancake steppers from a well known extruder manufacturer fail.

One was a short like dc42 is suggesting and the other had weak/failed permanent magnets in the rotor. Running a stepper too hot can cause both failures.

dc42

@mlbuxbaum said in Extruder "fighting" itself?:

I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

Look up M584 in the GCode wiki page.

mlbuxbaum

@dc42 said in Extruder "fighting" itself?:

@mlbuxbaum said in Extruder "fighting" itself?:

I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

Look up M584 in the GCode wiki page.

That didnt help much.... anyway.
How is the duet output color codes? green/black=coil 1 and red/blue=coil 2?

dc42

@mlbuxbaum said in Extruder "fighting" itself?:

How is the duet output color codes? green/black=coil 1 and red/blue=coil 2?

That's the normal arrangement for stepper motors, where the wires come straight out of a motor and not via a plug and socket. At the Duet, if you number the connector pins 1234 in order, one coil goes to 1-2 and the other coil goes to 3-4.

mlbuxbaum

@dc42 thank you

mlbuxbaum

Well, dont I feel like a real idiot.........The red wire on the E0 connector that plugs into the Duet was broken inside the connector. I found when I was moving the connector to E1.....