Re: [CAD_CAM_EDM_DRO] Pulley Selection / Requirements for Servo System

autom8_it wrote:

>I am retrofitting a bridgeport 9x42 clone and have 19lb-in servos. I
>now need the pulleys and I want to be sure I get what I need.
>
>My assumptions:
>Belt width: greater than 3/4"
>Pitch: Approx. 5mm.
>25 Teeth on Motor Pulley
>50 Teeth on Screw Pulley
>
>What is a standard set up on a bridgeport?
>

It depends on the characteristics of the motors you select.

>Does it matter what material the pulleys are made of? I have seen
>Aluminum and multiple steel types.
>
>

Aluminum should work fine unless you'll be doing production work.
But, in many cases, steel pulleys are cheaper.

>Will two set screws be good enough or should I use a taper lock
>bushing type?
>
>

If you can flat the screw end and motor shaft, then two setscrews should
be more than adequate. They have worked fine on my system for years.

>Then where to buy? I have looked at McMaster and they don't have
>much of a selection. I have also looked at Gates and they are
>expensive.
>
>

Stock Drive Products and W M Berg are good places for the widest selection,
but may be expensive.I got the parts for my recent minimill conversion
from McMaster-Carr, and they were fast about delivery, and seemed
to be a bit cheaper than the above distributors.

Jon