Re: [CAD_CAM_EDM_DRO] Is Single Phase Adequate?

Doug,
In your post, you indicated that the CNC could control spindle
speed. I'm just in the planning stage, but I didn't realize this was
possible.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Doug Harrison" <prototype@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 25, 2002 9:19 AM
Subject: Re: [CAD_CAM_EDM_DRO] Is Single Phase Adequate?


> Mark;
>
> Questions such as yours are what this list exists for. We need to remind
> ourselves of this from time to time.
>
> You will only need three phase for the spindle. A VFD (variable frequency
> drive) is probably your best choice. It will give you three phase from
> single phase and also allow you to adjust spindle speed with a knob, or
even
> from the cnc. You can find them now for as little as $300 new. Art
> Eckstein got a nice motor and matched VFD for about $350 as new surplus.
I
> think more are available (still looking for the bookmark).
>
> Doug
>
>
> ----- Original Message -----
> From: "natchamp_87" <mark@...>
>
> > Sorry if this is a stupid question. I am planning out my CNC mill
> > project and haven't bought a mill yet, but am leaning towards a BP or
> > similar 9/42. My question is: am I being realistic or not in
> > thinking single phase will be adequate for my mill? I know about the
> > single to three phase converters but want to avoid that if possible.
> > Am I also correct in that my CNC motors, whether servo or steppers,
> > will not require 3 phase because I will have a power supply
> > converting to DC for them? Sorry again if these are dumb questions.
> >
>
>
>
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