How do I vary the speed of the spindle?

[HereinCS]

Is there a way to vary the speed of the spindle?

[CanAm1]

Hello,

If you were like me you probably couldn't wait to get your machine up and running. So, we hooked the spindle up to the driver power supply and off we go making shards of stuff.
What we have to do is pick up a variable power supply that will go up to I believe 36 or 40 volts DC at around 3 or 4 amps. Once this is hooked up then its just a simple matter of setting the speed with the variable power supply before starting a project.
Unless I find a varible power supply out there that doesn't cost an arm and a leg I'm just going to make my own. Being in electronics since the early 70's finally has an advantage. I think I have all the parts, but I need to check.

Mark

[HereinCS]

Thanks. I've posted the similar question in the diy section. I've purchased a 40 PMW speed controller for $20. Hope it works.