Re: [CAD_CAM_EDM_DRO] Souces of Timing/Drive Pulleys

I use Bearing Headquarters in Morton Grove, Il.
Last order was Gates GT and about 60% of Gates list price.

It is almost expected that pulleys will be bored. I indicate off
the teeth with the hub in a four jaw. It is a pain watching the indicator
wiggle as it passes over them but I am sure it is concentric.

A line to line fit (bore and shaft same size) is a light press
but can be installed and removed easily by slight warming.
Aluminum has a much larger thermal expansion than steel.

Just a note... L, XL, and HTD are not known for extreme
registration accuracy. Check the Gates tech information
for more details.

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html

----- Original Message -----
From: "Mike Gann" <mikegann@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, May 18, 2001 10:20 PM
Subject: [CAD_CAM_EDM_DRO] Souces of Timing/Drive Pulleys


> I have been slowly gathering the parts for a retrofit of a small
> knee mill. The table size and travel is about equivalent to a
> mill/drill - 6" X 20" (size&travel).
>
> I will be fitting it with ball screws. And I am looking for a
> 2 to 1 drive reduction.
>
> Now to my question -
>
> What have all you guys been using as a source for your
> timing pulleys'?
>
> I have searched on the web and not really found anything.
> Unless I am looking for the wrong thing. MSC and McMaster
> didn't really have anything applicable. I found 2 to 1
> combinations on MSC in the XL belt style, but the largest
> combination (30 to 60) only had a bore size of 5/16 & 3/8.
> These are too small and would need to be bored out. I would
> rather not do that. (assuming the hub has the meat to bore out)
>
> Also, I have a limit of about 3" outside diameter for the small
> pulley.
>
> Any input or a point in the right direction would be great.
>
> Mike
>
> P.S. - What about prices? It looks like I can spend more on
> 2 sets of pulleys (4 total) than I spent on my motors (surplus)
>
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