Re: [CAD_CAM_EDM_DRO] Keyways or set screws

Frank wrote:

> The second hand servo motors I have for my CNC Lathe retrofit have
> keyways on their shafts. Are keyways OK to hold timing pulleys on the
> shaft, or should I just use set screws? (The pulleys will then turn
> the ballscrews). The shafts are quite large, 14mm and 16mm, and it has
> been tricky finding pulleys that will leave some hub after boring them
> out.
>

A tight-fitting key is very good. High-torque servo motors can loosen
any setscrew, although installing two screws, one on top of the other
has been a time-honored trick to keep them in place. Another scheme is
to drill a dimple into the shaft where the screw seats. The best scheme
is locking collars or collet hubs on the pulleys, although these can be
quite expensive new.

Jon