jwzFeb 27

Let Friction Ring.

Dear Lazyweb, I have this pulley wheel, 50mm inside diameter, 4mm groove. I need a rubber traction ring to go inside it. I cannot find anyone who will sell this to me. The ring must be flat or concave, not round like a typical...
https://jwz.org/b/yk33

Show threadAttila Kinali
@jwz If nothing works, you can always try getting a small, thin line of silicone on the inside. That should provide enough friction for such an application.
Feb 27 at 7:07pmWeb
Show threadjwzFeb 27
@attilakinali Silicone is not much hardier than sugru, so I doubt that will last.
Show threadAttila KinaliFeb 27
@jwz Hmm... I don't know sugru, so I can't say. But I do know that silicone is used in such applications (often injection molded) friction layer inside transmission wheels. Maybe that's a specialized variant. Maybe it's low performance systems only. Maybe it's just because it's thin enough and thus doesn't need much sheer strength...I don't know....