RE: [CAD_CAM_EDM_DRO] Souces of Timing/Drive Pulleys

My Shoptask is set up with 42T:21T 3/8" width XL series pulleys to get the
2:1 ratio. I do currently have one axis set up with a 42T:14T for a 3:1
ratio. I have gotten a number of these steel pulleys from McMaster Carr and
they have more than enough meat to bore them out and it is quite an easy
task. Don't see any reason you need to go to the expense of the larger
pulleys. I understand that it will yield a longer belt life and a greater
load capacity, but I think you would find that something like a 40:20 or
42:21 will work just fine and save you some money.

If you think these pulleys are expensive just take a look at the L series or
the GT and you will suddenly consider XL pulley cheap.

Tim
[Denver, CO]

> -----Original Message-----
> 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)
>
> FAQ: http://www.ktmarketing.com/faq.html