Re: [CAD_CAM_EDM_DRO] Keyways or set screws

They serve two different purposes: to do a good job you need both.
Keyways transmit torque, setscrews hold everything in place and keep
the pulley from sliding axially. The proper setup has a standard
keyway, as well as two setscrews, one directly over the keyway
(holding the key in place), and one 90 degrees to the keyway.
Preferably, the setscrews should bear on a flat cut on the shaft, and
not the round surface of the shaft, but often this is one too many to
ask.

On Tue, Dec 16, 2008 at 11:45 PM, Frank <ftkalcevic@...> 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.
>
> Thanks,
> Frank
>
>