RE: Got Gates Timing Belt Information

Les,

Excellent. Glad to hear everything worked out OK.

Gary

> Date: Mon, 19 Feb 2001 16:32:26 -0500
> From: "Les Watts" <leswatts@...>
> Subject: Got Gates Timing Belt Information
>
>
> Ok I got the design information. Gates ran it on the software
> to double
> check. I will be using GT 3mm pitch 15mm wide at 40 lbs
> tension. I can
> expect positional accuracy well under .010" but slightly
> reduced belt life.
> This is good enough
> to keep the encoder on the motor as it is the equivalent of
> less than .0003" cyclic error or backlash on a 5 turn per inch
> ballscrew. This belt would be pretty close for any servo/stepper
> transmission of similar type and is much better than HTD or
> trapezoidal-
> some several times in position accuracy they say.
>
> The 80 lb load on the motor bearing is beyond it's fatigue limit
> of 27 lbs but that just means it won't last forever. Dynamic
> load rating on
> that bearing is 5000 lbf so it will last a while!
>
> According to the ap engineer 2 and 3 mm pitch are known
> as GT. 5, 8, and 14 are known as GT-2 and are HTD
> compatible. So a GT sprocket is only for GT belts and will not
> fit any other. I mentioned that the 2, 3, and 5 were called
> GT-2 on a Stock Drive Products price list and he said this
> was in error. And
> that was just a copied Gates document.
>
> Confusing , huh?
>
> I wanted to be sure because those spockets are as much as
> $50 each in 2" size. I have a few to buy.
>
> OK now to call in the order and then back to the shop!
>
> Leslie Watts
> L M Watts Furniture
> Tiger, Georgia USA
> http://www.rabun.net/~leswatts/wattsfurniturewp.html
>