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Re: speed control

To: shop-talk@Autox.Team.Net, (Dave Williams)
Subject: Re: speed control
From: Roger Korn <>
Date: Mon, 19 Jan 1998 19:02:54 -0800 (PST)
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. The modern speed
controls work very well - speed is practically constant from zero to full
load, and you can really go down to 40 or 50 rpm with an 1800 rpm motor. I
build custom potter's wheels for doing BIG work (like a 7 foot high, 8 foot
wide pot for a pine tree, weighing 900 lb) and use this combo all the time.
It's great, but boy is it EXPENSIVE. 

How about using 4 or 5-step pulleys? Not as cool, cause you gotta stop and
move the belt, but it's WAY cheap.

Another route is to use the Makita 1/2" "Arm-buster" as its known. They're
about $130 and even the sheetrockers, who abuse the hell out of them mixing
mud, get a couple of years out of them. I think top speed is 600 rpm, but
they'll go down to real slow too.

Good luck, Roger

At 01:36 PM 1/19/98 -0500, you wrote:
> I've been thinking about building a honing rig for honing blocks.  My
>Sunnen cylinder hone works just fine, but it kills a 3/4hp drill in
>short order.
> I drew up a nice rig using a 1hp industrial motor on an arm.  Looked
>nice until I thought about varying the speed.  How can a vary the speed
>of a 1hp (760w) motor?  Would an ordinary light dimmer work?  One of my
>industrial catalogs had a dandy electronic speed control for only
>$300... ouch!

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