[RCaffin]

If you are trying to buy a switched-mode 60 VDC power supply for the drivers on your CNC,
DON'T
It won't work.

Buy a 40-42 VAC output transformer (a big one), a high-current diode bridge, and a large capacitor rated at 80 VDC or higher (or several of them). This combo should give about 60 VDc - unloaded it will be a shade higher than this.

To explain: SMPS units may produce a fairly stable output voltage at high current, but most of them will also have a lot of noise on the output - RF interference type of stuff. This RFI will play merry hell with your drivers (if they are modern ones). Modern drivers are designed to work with very simple transformer/bridge/cap power supplies, and the doco will normally tell you this.

Cheers
Roger

[109jb]

If you are trying to buy a switched-mode 60 VDC power supply for the drivers on your CNC,
DON'T
It won't work.

Really? Then how come it does on my CNC and countless other CNC's out there. While I agree that an unregulated PS as you describe may be ideal, but saying that a SMPS won't work in bold letters is just plain false. You mention that the RF plays havoc with "modern" drives without even knowing what drives he has. He already has the power supplies as he mentioned in post #1 so you would have him buy an unregulated power supply before even trying the ones he has? In regard to the RF from a SMPS, yes it has some, but with proper design, shielding, filtering, etc. it is not a problem and it WILL[ work

[reg.miller]

Probably less dogmatic statements would bemore appropriate. There are many drivers and far more many switch mode PSUs all designed to fit certain specs. Trying to make blanket statements like things DONT or WILL work is by definition wrong.

I found HP printer sw mode PSUs worked rather will as a cheap solution ( you can pick them up 2nd hand for about ten eurobucks ). They deliver 3A which is not too bad but the 32V was bit light for my needs of driving chinese motors which have unnecessarily high resistance and impedance. They are FCC approved for office and home use thus have reasonably good shielding.