Re: [CAD_CAM_EDM_DRO] B: Brushless motor

Michael Holm wrote:

> Sorry if this is off-topic, but I need some help here...
>
> I build my own CNC mill, images at www.gizwiz.dk, and I need a brushless motor to drive the spindle.
>
> So far I have burned two Proxxon drills, guess they just ain't cut out for it.
>
> The thing is that being a student, I can't afford to buy one. I talked to local companies, and they charge from $400 to $600 for a motor with controller, and I can't afford that. So now my mill's just standing there, doing nothing - and it's eating me up. :o(
>
> Does anybody have a used brushless motor, with or without controller in a drawer somewhere? - I'd love to buy it - cheap please.
>
> I'm in Denmark (Northern Europe) - hope that's not a problem.

Why? Is it against the law to use brush motors there? Why does it have to
be brushless? The only reason I can think of is for operation above, say,
40,000 RPM. As for controllers, unless you need variable speed under
computer control, an adjustable DC power supply will probably work.
A variac, transformer, rectifier and capacitor will vary the speed with only
slight response to line voltage variations, for this purpose.

Jon