Re: VFD Selection

Leslie,
It seems to me a Variac only limits the voltage going out. I
already tried a variable router speed controller found at:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=43584

This router speed controller does not work since my rouers normal
speed range is 8k - 20k rpm and I need to have a speed of about 1k
rpm. The speed controller cannot slow this router below 8k it
seems.

Are you saying that a VFD cannot work with my router?

Thanks,

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Leslie M. Watts"
<leswatts@a...> wrote:

> George,
>
> You don't need a VFD for a unversal wound router motor.
> It's speed is not dependent on line frequency.
> Typically a phase control triac system is used. It is similar
> to a light dimmer but has IR comped backemf or tach feedback
> to contol the speed.
>
> Granger, MSC, etc have many of these, and some are well under
> $100.
>
> A variac works as well, but with poorer speed control.
>
>
> Leslie M.Watts
> L M Watts Furniture
> Tiger Georgia USA
> (706) 212-0242
> http://www.lmwatts.com
> Engineering page:
> http://www.lmwatts.com/shop.html
> CNC surplus for sale:
> http://www.lmwatts.com/forsale.html
> CNC carved signs:
> http://www.lmwatts.com/signwp.html
>
>
>
>
> -----Original Message-----
> From: george_barr [mailto:george_barr@y...]
> Sent: Tuesday, April 13, 2004 2:34 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] VFD Selection
>
>
> I want to get a VFD for my Hitachi M12V router so I can vary the
> speed for metal, aluminum, and wood milling. The M12V is a single-
> phase series commutator motor, 115VAC, 60HZ, 15 Amps router. I

would

> like to use my 120VAC outlet for the VFD. Can someone tell me what
> kind of VFD I should get? I have noticed some VFD have 3 to 1 phase
> conversion and all sort of specifications. I certainly do not want
> to buy the wrong one. Also, it should interface to my pmdx.com

break

> out board.
>
> Thanks,
>
>
>
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