The Dreaded X axis stepper error using UC400ETH and UCCNC !!!

[dazp1976]

Agree. My steppers have been running at 68V on 80V drivers for several years too.

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

[Ger21]

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

It's not that simple.
A 450oz Nema 34 rated at 6 amps will usually easily outperform a 570oz Nema 23 rated at 5 amps.
Inductance plays a large role. And typically, smaller nema 34 low inductance motors can spin much faster than large Nema 23 motors.

[m_c]

It's not that simple.
A 450oz Nema 34 rated at 6 amps will usually easily outperform a 570oz Nema 23 rated at 5 amps.
Inductance plays a large role. And typically, smaller nema 34 low inductance motors can spin much faster than large Nema 23 motors.

Ger, I think you got your motor sizes mixed up there...

[JAZZCNC]

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

Horses for courses and You've got the right motors and voltage for that machine. Routers are a different animal so extra torque higher up speed curve helps.

[Clive S]

Horses for courses and You've got the right motors and voltage for that machine. Routers are a different animal so extra torque higher up speed curve helps.

Bloody hell Dean where have you been Nice to see you back

[JAZZCNC]

Bloody hell Dean where have you been Nice to see you back

Got to get back on the horse some time Clive.

[dazp1976]

Horses for courses and You've got the right motors and voltage for that machine. Routers are a different animal so extra torque higher up speed curve helps.

They don't give the speed I was hoping for but that may be down to the resonance I seem to get. It won't help. The inductance for them shows 4.1.
Looking at curves though the torque is equal between the 23 & 34 at 400rpm and over.
The 34 do however give very good acceleration so it's not all bad.
Spindle rpm will likely only allow 600mm/min anyway with 8mm 3flute.

Still an unfinished project.
The machine is more or less built, oil system is in, enclosure has minor snagging issues. Really I just need to finish the coolant system and I'm ready for first chips.

[JAZZCNC]

They don't give the speed I was hoping for but that may be down to the resonance I seem to get. It won't help. The inductance for them shows 4.1.

What drives are you using.?

4.1Mh isn't bad for nema 34 from that i guess it's 8 wire motor wired in parallel. If it's a 4 wire which are often wired series I'd expect much higher inductance so would question that 4.1 figure.?

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[dazp1976]

What drives are you using.?

4.1Mh isn't bad for nema 34 from that i guess it's 8 wire motor wired in parallel. If it's a 4 wire which are often wired series I'd expect much higher inductance so would question that 4.1 figure.?

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I did wonder that. These ones:
https://www.ebay.co.uk/itm/German-Sh...72.m2749.l2649

https://www.robotics.org.za/85BYGH450D-008

[JAZZCNC]

I did wonder that. These ones:
https://www.ebay.co.uk/itm/German-Sh...72.m2749.l2649

https://www.robotics.org.za/85BYGH450D-008

Think Those 860ma drives are analog version which are junk and will be holding those motors back massively. Replace with digital and you'll get different machine.

Regards the motors it looks like they could be parallel wired version but the datasheet on web site doesnt match the spec so I'd still be suspicious.? All the 4 wire they show have high inductance.!

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