Re: ATM - More Grinding Machine ideas

["Frank Ward" <thewards@mindspring.com>]

When designing your machine don't leave
out step down shafts.

If your motor runs at 825 and you put a 
one inch pully on it (cheap) to drive a 
reduction set like inyour drill press you
will have a selection of speeds. Just use
a take off pully or another reduction set
on the bottom of your table shaft.  Combining
them should get you quite a nice selection.

I, however, am stuck with a 50 RPM table and
have adapted to it.  My overarm has a throw
of 10 rpm which matches it well.

Frank Ward
Atlanta, GA
P.S. Dump the drill press idea before you start.
You'll want a dedicated table very soon.....why not
start with one?
----- Original Message ----- 
From: Adam Perkins <scopeguru@yahoo.com>
To: <atm@shore.net>
Sent: Saturday, April 07, 2001 11:49 PM
Subject: ATM - More Grinding Machine ideas


> 
> Hi Again,
> 
> In my previous post, I left out a design idea I'm
> considering for my mirror grinding machine.  I've seen
> an old "Gleaning For ATM's" article concerning the use
> of homemade pulleys for a belt-reduction system. 
> These were hardwood blanks turned on a wood lathe
> against a v-belt shaped cutter.  The scheme looked
> good in the photo, but was not nearly the diameter I'm
> thinking about.
> 
> I'm proposing to make some large (12-18" dia) pulleys
> to achieve large reduction ratios in my machine.  A
> large disk of plywood rotated in a jig against a
> router bit or table saw blade to cut the necessary
> groove is what I'm envisioning.
> 
> Has anyone here tried making anything like these?  Big
> pulleys are expensive (and I have found none at all 
> for sale in this size range).  I'm a little worried
> about wear on the belts from the wooden surface, does
> anyone have suggestions for a finish?
> 
> Thanks in advance for your input,  I've learned from
> several years of constant lurking and sporadic input
> that this group is frequented by a long list of people
> whose advice is a resource I really cherish.  I have
> never before been involved with such a great crowd.
> 
> Adam Perkins
> Covington, Louisiana
> USA
> 
> 
> 
> 
> 
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