NEMA 23, weird velocity results.. need help

fannlow wrote:

Max doable without stall or missstep is 785mm/min.
Safe bet is around 750mm/min or any place lesser is ok.
However, stepper isnt turning as if its much faster?

Notice that this is mm per minute and the INI file values are mm per second

750mm/min is 94mm/sec, which does sound like an improvement.
It is 420 rpm, which is about what you can expect from a stepper at 36V. (perhaps a little low)

Have you checked the voltage into the drives at max motor speed? (I think you reported the voltage at the motors, but that is chopped by the current limiter, so can't really be measured with a multimeter.

Did I mention that my lathe only manages 25mm/sec and is entirely acceptable to me?

fannlow wrote:

750/60sec = 12.5mm/s?

Ah, yes. Don't know where I got my number from.

How do I measure how many volts is going through?
And where do I measure it?
What should I be getting?

Measure at the output of the power supply, just to be sure it is maintaining the voltage.

fannlow wrote:

Using the calculator
3A, 6.8mH & 36.6V from the driver board to my motor,
I can turn max at 4.49rev/s, 1.11 min time/step & 110watts.

Sounds about right, unfortunately.

You might actually get better speed with shorter steppers with a lower inductance. It is the inductance that is preventing the motors spinning faster by the sound of things.

How many wires do your steppers have? If they are 8-wire then you might be able to re-wire in parallel config for more speed.

fannlow wrote:

So, will running the average 2.37A on my driver DIP be able to help me go faster?

No, and I don't know why the calculator says that it will.