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Re: speed control

To: "Charles B. Andes" <>,
Subject: Re: speed control
From: (Gano, Ken)
Date: Wed, 21 Jan 1998 21:01:18 -0600
Most power transmission manufactures make a similar product (Browning, for
one), but me thinks the range of adjustment might be to small

-----Original Message-----
From: Charles B. Andes <>
To: Dave Williams <>; shop-talk@Autox.Team.Net
Date: Tuesday, January 20, 1998 8:25 PM
Subject: Re: speed control

>Are you familiar with the variable pulley like used on ShopSmith machines?
>The front panel knob moves the pully sides apart and together, changing
>speed. Perhaps you can find a used head or just order a pully.
>> From: Dave Williams <>
>> To: shop-talk@Autox.Team.Net
>> Subject: Re: speed control
>> Date: Tuesday, January 20, 1998 1:26 PM
>> -> It gets worse. You also need a DC motor that will run about $400 for
>> -> 1hp. The prices in Grainger's are, unfortunately, hard to beat.
>>  How is it I can buy a 3/4hp variable speed drill for $75?  I know the
>> power is overrated and the service factor stinks, but I don't understand
>> what makes one type of application cost so much more than another.
>> -> How about using 4 or 5-step pulleys? Not as cool, cause you gotta
>> -> stop and move the belt, but it's WAY cheap.
>>  I'm already using step pulleys.  However, I need to vary the speed
>> somewhat in between the ranges.  And it's not practical to stop while
>> doing it.  I don't need a *lot* of speed adjustment, but I have to
>> compensate for load changes.
>>  I thought about going to a 2hp, 3400 RPM motor, geared down to 100
>> RPM, and not worrying about speed changing with load... but by the time
>> it saw enough load to worry about it'd probably rip the stones right off
>> the holders.

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