Re: [CAD_CAM_EDM_DRO] Re: VFD Selection

On Tue Apr 13 23:21:33 2004 Jon Elson wrote:

>george_barr wrote:
>
>>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?
>>
>>
>No VFD will work on a series-wound brush motor. You are trying to get
>appreciable power delivered to a cutting tool at 1/8th of the lowest
>operating speed of the motor? Good luck, and I hope you can
>afford to replace it once you burn up the motor. At 1000 RPM, it
>will only have the torque available for the 8 - 20K RPM range, but
>at 1/8th the speed, the power produced will be miniscule. The cooling
>airflow through the motor will likely be something like 1/64th of normal,
>too!
>
>Jon

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