60-70v unregulated power supply recommendations

[Clive S]

Is there a reason you are using just two motors like it is a lathe?

I run 4 nema 23 on my router without problems and 3 on the mill both with 500va transformers the next one up is 625va.

Remember that the motors rarely all run at peak current together.

[GND]

And your calculations should use the AC rather than the DC voltage as the factor into the VA rating - so your figures immediately fall by a factor of 1.4! The DC output is essentially the peak value of the AC voltage, having been rectified and filtered, whereas the VA rating is RMS.

Hope that helps!
Graeme

[Agathon]

Is there a reason you are using just two motors like it is a lathe?

I run 4 nema 23 on my router without problems and 3 on the mill both with 500va transformers the next one up is 625va.

Remember that the motors rarely all run at peak current together.

It's a 3 axis mill Clive but I initially thought that I'd run the Z axis (which is just a quill with 150mm travel) with the 36v SMPS as it needs very little power. However, now that Graeme has put me right about using the AC voltage I think a 500VA supply will comfortably run all three axes. I can use the SMPS to run the 4th and 5th axes when I get round to them - happy days.

I have another problem to overcome with this machine since it has a quick-change tooling system with the tool ejected when the quill is fully retracted. There are three microswitches two associated with the normal Z- Z+ with the third setting the limit for tool ejection. I'd like to do this automatically in Mach3 rather than having to manually jog up beyond the limit switch. I'll start a new thread on this.

Thanks for all your help. Much appreciated.

I'll post some photos and maybe a video or two once I've tidied things up a bit.