Re: [CAD_CAM_EDM_DRO] VFD's - Variable Frequency Drive

Tom,
I have a motor on my Enco mill, that's exactly the same size as
yours, in fact, it's also 2-speed, and I've been running it on a Mitsubishi
VFD at 30% to 40% constantly, with no problem. I think that lathe sales guy
should go back to school.

Marv Frankel
Los Angeles

----- Original Message -----
From: "mayfieldtm" <mayfiet@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, March 18, 2003 4:33 PM
Subject: [CAD_CAM_EDM_DRO] VFD's - Variable Frequency Drive


> I just ordered a "Variable Frequency Drive" for
> use on my 14" Lathe.
>
> In hopes of keeping this on topic, I plan to convert
> the Lathe to CNC and control the Spindle Speed.
>
> The Lathe Motor is a 2 Speed, 3HP, 3 Phase, 220V motor.
>
> When I inquired with the Lathe Sales Person on the
> Amperage Rating of my Motor. He said that I should
> never run the Motor under 40Hz, in that it could
> damage the Motor.
>
> Is this true?
>
> I mean I would expect that very slow or fast speeds
> are not desirable, but, 40Hz is only 67% of normal.
>
> (I was planning to use a range of about 20Hz to 90Hz.)
> (3 times slower to 50% faster)
>
> After all the glowing comments that I've read by "happy"
> VFD users, now I have doubts about my purchase.
>
> Any one have a VFD, and any comments?
>
> Tom M.
>
>
>
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