Let Friction Ring.
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@jwz Maybe you've already looked here, but if McMaster Carr doesn't have what you want, it probably doesn't exist
https://www.mcmaster.com/products/pulleys/Can you replace the rope with a rubber belt? https://www.mcmaster.com/products/pulleys/round-belts-1~/
@grwster No, replacing the rope is not an option. The problem with McMaster is that I demonstrably don't know what the thing I am looking for is called, so can't search for it.
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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@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 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.
@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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@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?
@jwz What second wheel? I only meant modifying this one, or else a replacement like you indicated openness to in the post. (And was volunteering to help with the mods if needed.)
Is the groove semicircular, such that a round belt would fit snuggly in it with full contact all the way around, or does it have tapering straight sides and a flat bottom?
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@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?
@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.
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@jwz What second wheel? I only meant modifying this one, or else a replacement like you indicated openness to in the post. (And was volunteering to help with the mods if needed.)
Is the groove semicircular, such that a round belt would fit snuggly in it with full contact all the way around, or does it have tapering straight sides and a flat bottom?
@attoparsec Oh, I thought you were suggesting sandwiching the cord between two wheels. Sorry.
The groove inside the wheel is flat on the bottom. Basically it's a 50mm x 4mm disc with a pair of 54mm x 1mm disc walls on the outside.
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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@jwz I'd be tempted to paint it with Plasti Dip, since that product's entire purpose is to rubberise things to make them grippy. You might want to apply quite a few coats for it to not go the same way as the Sugru.
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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@jwz Could you take a strip of 4mm toothed-belt / timing belt and glue it in there with the teeth facing out of the groove? It should provide enough friction and hold up well but it might also wear down your rope.
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@attoparsec Oh, I thought you were suggesting sandwiching the cord between two wheels. Sorry.
The groove inside the wheel is flat on the bottom. Basically it's a 50mm x 4mm disc with a pair of 54mm x 1mm disc walls on the outside.
@jwz Well, I was going to say that trying a round belt pulley would be the easiest place to start, but now I can't find one with a hub and set screw, even imperials ones I'd need to bore out. So I guess I'd fall back to the timing belt pulley idea. The diameter would be a bit less, but I think the ridges would make up for that.
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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@jwz Have you tried an ordinary rubber band inside the groove?
Or something ever so slightly more specialized, like one of these? https://www.amazon.com/dp/B0GGB2MDHT
(sorry for the Amazon link)
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@jwz Could you take a strip of 4mm toothed-belt / timing belt and glue it in there with the teeth facing out of the groove? It should provide enough friction and hold up well but it might also wear down your rope.
@praxeology I tried that and it was impossible to stretch the belt enough to get it over the lip.
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@jwz Have you tried an ordinary rubber band inside the groove?
Or something ever so slightly more specialized, like one of these? https://www.amazon.com/dp/B0GGB2MDHT
(sorry for the Amazon link)
@trs Yes, like you, "is there a rubber band in the house somewhere" was literally the first thing I thought of.
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@praxeology I tried that and it was impossible to stretch the belt enough to get it over the lip.
@jwz @praxeology if thinking of gluing, maybe just cut the belt, measure in place for the exactly right length and glue it down there with contact cement ? -
@jwz @praxeology if thinking of gluing, maybe just cut the belt, measure in place for the exactly right length and glue it down there with contact cement ?
@Primavera @praxeology There is not a hope in hell of that standing up over time.
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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@jwz Misumi sells configurable pulleys intended for round belts, with vee grooves for non-slip, e.g. P/N SL-MBRDA45-2-P8. It’s pricey (US$22). Search on Misumi Components (they’re worldwide).
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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@jwz on a conveyer belt system it would be called "pully lagging". But I've never seen anything like it on a machine like yours. Not sure if that keyword helps you?
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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@jwz do you or a neighbor have access to a 3D printer and a spool of TPU?
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@jwz do you or a neighbor have access to a 3D printer and a spool of TPU?
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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@jwz cut a strip of adhesive backed skateboard grip tape?
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@jwz cut a strip of adhesive backed skateboard grip tape?
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