After all this is all a learning process for me.
Oh, it is that for ALL of us!
Keeps me out of my wife's hair, anyhow.

Cheers
Roger

Resonance?

I took the 3 amp motor that was working fine on one amp, and hooked it up to 3 amps.
 
It suffered the same symptoms as the 1 amp motor at one amp.

So... resonance?

How do I keep my new steppers from not doing this?

I'm going to play with underclocking.

There are several ways to deal with resonance - I think I mentioned this earlier.

* Never go near it (stay slow)
* Try to make a mechanical damper to fit on the shaft (negligible likelihood of success)
* Try to damp it down with a toothed belt and a lead-screw (with LOTs of prayers)
* Buy a modern driver which includes electronic resonance damping.
* Use a bi-phase sinewave drive rather than steps. This may or may not succeed, and is almost the same as using a modern high-order micro-stepping driver anyhow.

Cheers
Roger

There are several ways to deal with resonance - I think I mentioned this earlier.

* Never go near it (stay slow) It happens at a very slow speed
* Try to make a mechanical damper to fit on the shaft (negligible likelihood of success) Then I won't bother with it
* Try to damp it down with a toothed belt and a lead-screw (with LOTs of prayers) Then I won't bother with it
* Buy a modern driver which includes electronic resonance damping. In time, in time....
* Use a bi-phase sinewave drive rather than steps. This may or may not succeed, and is almost the same as using a modern high-order micro-stepping driver anyhow. Then I won't bother with it

Cheers
Roger

In the meantime, I'm going to play with multistepping and/or underclocking. It's possible that my drivers are over amping. I don't have a way to test that.

Multi-stepping is your best chance.

Cheers
Roger

Multi-stepping is your best chance.

Cheers
Roger

So far multistepping gave the most promising results.

I did some reading and watching of YouTube videos and have a better understanding of resonance and I am convinced my problem is just that. Resonance.

Now I will be exploring the various methods of removing the resonance factor.

Thanks for pointing me in the right direction.

I wouldn't do too much work if you are not keeping these motors - it will all change with new motors and certainly with new drives

I wouldn't do too much work if you are not keeping these motors - it will all change with new motors and certainly with new drives

Point taken.
Anything I do with these motors now is to gain a better understanding of things. I'm not looking for a solution, per second, but more of a path to a solution.

So, I'm looking at new components to purchase.

(I should start a new thread but this will suffice for now)

The stepper motors I'm planning on using are:
Dual Shaft Nema 23 with rated 439oz.in torque
Full Step Angle:   1.8° (200 Steps)   
Rated Current per Phase:   3.5A   
Holding Torque:   3.1Nm
Resistance per Phase:   1.1ohms   
Wiring Configuration:   4-Wire Bipolar   
Nominal Rated Input Voltage:   24 V, 48 V
Actual Rated Input Voltage:   24-48VDC

Power supply:
Wide Range 100-240V AC-DC 600W 48V12.5A
High efficiency, high reliability, low cost.

High 600W power to fit more devices.

Wide range of input voltage support, both of 100-120VAC
200-240VAC input voltage are available(Adjusted By Switch)
Adjustable approx 40-52VDC Output Voltage support.
PWM control and regulation, insure the steady and precise output voltage.
Built-in a powerful fan for cooling.
Built-in EMI filter.
100% full load burn-in test.
Over current, over voltage, short circuit and overheat protections.
Low output ripple and yawp.

Connected with either 16/4 wire or more widely available 18/4 wire.

I will be installing it all with aviation connectors from the control box to the motors.

This should give me the best, solid, system.

After all is assembled and I have a working machine (even if it has bugs) I will update the drivers and controller.