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Warco VMC mill conversion

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9fingers:
That's right Rob.
On a dc supply there should be no ac present but there tends to be a small amount plus some induced 50hz in the leads. Twist the leads for as much of the length as is practical to reduce this effect.
If your meter has a peak hold feature then that can be useful.

I've looked at the diagrams the supplier suggests for wiring up the power supply and drivers and am surprised to see no big capacitors shown to be fitted close to the drivers. The power supply will have some inside but they will be designed to reject the internal switching frequency of the PSU at around 100kHz.
Maybe they are not shown for a good reason or maybe a genuine omission?
When I get round to it I'll be making my own PSU as I prefer linear supplies and can experiment then.

Bob

philf:
Hi treb63,

I assume that you've set the current on the drivers and that you've wired the motors correctly? Mine is a smaller machine with Nema 23 3.1Nm motors wired parallel and I use much less than the rated current without stalling. I'm using switched mode supplies at around 42V with no extra capacitors.

Also - are you using microsteps? Full stepping can have resonance problems where, at certain speeds, the torque almost disappears. I run mine at 8 microsteps.

Phil.

AbrahamLom:
Looks like a nice mill. Solid appearing from the very limited views. Went for cheap if under 300 bucks. Hope it was you.

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