Mastodawn

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

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Matthew Dockrey Feb 27

@jwz Hrm, I don't know of anything like that. Couple thoughts:

Is the pulley intended for round belts? If it's just a random hardware store v-belt pulley, there might be some extra friction to be had with a round belt one.

I wonder if the ridges on a timing belt pulley would give enough friction (without shredding the rope). I don't see any near that diameter, but we could cut ridges into a larger plain one.

I see what you mean about using an o-ring, but what about two, sized to fit side by side inside a v-belt pulley? That would leave a little groove between them that the rope could ride in.

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jwz Feb 27

@attoparsec No, I'm not re-engineering the entire thing to have a second wheel, come on.

How the fuck am I supposed to know what the pulley was "intended" for?

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jwz

@attoparsec The thing that confuses me is that, here is a wheel that is intended to move a band through friction. So let's make the surface as slick as possible! No there is not an option for a non-slick surface, why do you ask.