Belt or Sprocket Adapters ???

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Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Thu Oct 22, 2015 12:31 pm

I have been reading this thread “Belt drive Sprockets on the Cheap!” and did not see any mass production solutions.
https://endless-sphere.com/forums/viewtopic.php?f=28&t=26122

Has any one done any 3D printing of large pulleys?????

I need some for using “large-as-possible-diameter” (over 100 teeth?) 8mm Gates GT2 or 3 belts to drive the brake side with disc brake. Or a sprocket drive like below photo.
I need to slow the bike down to about 17mph to get enough power at 1500 watts when moving 400 or more pounds up a 9 % grade.

Some one here should be doing that or at least adapters for existing pulleys. Or some other way to mass produce adapters to attach a belt pulley to the inner-side of the disc mount, off set enough to clear the brake so it can still be used (and also use 2” tires).



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Re: HELP! Belt or Sprocket Adapters ???

Postby kenkad » Thu Oct 22, 2015 2:48 pm

Hugh,
Here are a couple of JPGs of an actual build, JPGs are from 3D CAD. The hub flanges are 58mm apart. The hub was a 12x135 and a spacer was added to make it 12x142, with the spacer only on the disc hub side so there would be no dishing of the rim/tire. I made the 74BCD spyder for the 30 tooth cog and the cog is already 7mm toward the hub center from the disc mount face. The rotor shown is 160mm. I will have to go to a 180mm rotor or else put a 12mm spacer between the disc mount face and the rotor (as shown in the JPG) so that the disc caliper body (Hayes Ace 4 piston) clears the chain. Fortunately, I have a two stage reduction so the smaller (<32) will work OK. This is a trike rear swing arm design but is similar to your issues. A two stage reduction may help solve your problem, just a suggestion.
Attachments
performer caliper #2.JPG
(235.79 KiB) Downloaded 11 times
performer caliper #1.JPG
(143.61 KiB) Downloaded 11 times
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Sat Oct 24, 2015 12:28 pm

thanks... you had to make ab adapter for the brake also?

but has no one made one to just buy?
Image

I found this adapter with Aluminum sprockets.
http://www.kingssalesandservice.com/top-hat-sprocket-adaptor/

Why do these people use aluminum for their candy colored sprockets?
Don’t they realize that even aerospace aluminum if wimpy compared to aerospace steel? And for a motor they can’t possibly last long.
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Sat Oct 24, 2015 1:02 pm

ok here is another, but it does not fit around a disc brake. maybe I have to use a drum brake?

https://endless-sphere.com/forums/viewtopic.php?f=28&t=36534

Image
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Sat Oct 24, 2015 1:10 pm

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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Sat Oct 24, 2015 1:25 pm

but how did he mount the disc brake?

[url]
viewtopic.php?f=28&t=57720&start=100[/url]


Image
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Sat Oct 24, 2015 1:32 pm

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Re: HELP! Belt or Sprocket Adapters ???

Postby Chalo » Sat Oct 24, 2015 4:15 pm

Find you how much clearance you need on the back side of the brake caliper. Also note that the disc adapter you found will move your brake rotor outwards by the amount of its thickness. Your brake might or might not have enough adjustment to accommodate.
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Mon Oct 26, 2015 12:36 pm

yes there maybe a problem moving the brake over the thickness of the adapter. I am trying to find pictures.

Chalo wrote:Find you how much clearance you need on the back side of the brake caliper. Also note that the disc adapter you found will move your brake rotor outwards by the amount of its thickness. Your brake might or might not have enough adjustment to accommodate.
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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Wed Nov 04, 2015 4:17 pm

ok not finding what I need, how about this? it bolts on the spokes from the inside...looks like the sprocket will not fit around the rotor mount??

OK they said the center hole of the large sprocket is 2.5".....so then I gotta figure out if there is still room for the brake and rotor.

I am starting to think that people just do not care about stopping their over powered e-bikes.

http://www.bikeberry.com/bbr-tuning-sprocket-adapter-assembly.html?gclid=COTDv8XX98gCFUhlfgodQA8Cyg

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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Wed Nov 04, 2015 4:41 pm

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Re: HELP! Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Wed Nov 04, 2015 5:00 pm

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Re: Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Mon Dec 21, 2015 5:02 pm

what is this.. how can I set one of these up with #219 chain?

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Re: HELP! Belt or Sprocket Adapters ???

Postby sn0wchyld » Fri Dec 25, 2015 10:42 pm

Hugh-Jassman wrote:thanks... you had to make ab adapter for the brake also?

but has no one made one to just buy?
Image

I found this adapter with Aluminum sprockets.
http://www.kingssalesandservice.com/top-hat-sprocket-adaptor/

Why do these people use aluminum for their candy colored sprockets?
Don’t they realize that even aerospace aluminum if wimpy compared to aerospace steel? And for a motor they can’t possibly last long.


Image
Image
have a look at my norko build thread - ive made one for the disk side adapter myself to suit a shimano centerlock. Where about do you live? as i can probably make another for a few $$$. They're a bit of work though...

Works a charm now that i've got the motor running well with the controller, though i've still got issues with my pedal chain line.

Aluminium sprockets are fine for the larger chainring (like, sprockets over 30t or so) particularly with hard anodizing. They wont last as long as a steel one sure, but they're lighter and (sometimes) much cheaper. You can pick up decent 70t 219 sprockets for about $10 on flebay.
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Belt or Sprocket Adapters

Postby Hugh-Jassman » Mon Oct 17, 2016 8:19 pm

How much wider is the adapter; what axle width? And do I need to spread the forks a bit?

It looks like it may need a special hub....??

Image
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Re: Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Tue Oct 18, 2016 1:40 pm

I really like this one. Does anyone know why it may not work?

like where can I get large sprockets for it? I need to do a 9:1 reduction so maybe a 144 tooth?

Looks like I will need a longer axle, about 1/4 inch?


http://www.bicycledesigner.com/rotor-and-sprocket-adapter.html


Image
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Re: Belt or Sprocket Adapters

Postby sn0wchyld » Tue Oct 18, 2016 10:01 pm

Hugh-Jassman wrote:How much wider is the adapter; what axle width? And do I need to spread the forks a bit?

It looks like it may need a special hub....??

Image


standard 150mm 12mm hub, cut up an old disc to get the adaptor. No wider than standard, though i had to mod the caliper adaptor to fit it all in.
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Re: Belt or Sprocket Adapters ???

Postby boisrondevens » Wed Oct 19, 2016 12:54 pm

I love the idea of have the adapter on the left side but my problem is grease. I don't even like to touch my disc brake with my hangs by fear of putting grease on them. I can imagine the greasy chain splashing grease on them. Very clever idea but not practical for that aspect. My two cents
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Re: Belt or Sprocket Adapters ???

Postby madin88 » Wed Oct 19, 2016 1:53 pm

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Re: Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Wed Oct 19, 2016 3:42 pm

I'm glad you said that....I think it maybe ok for a belt drive.? a wax lube may keep it reasonably clean.....mabe.

are there any right side sprocket adapters, or is the only way to custom mount the large procket onto the hub?


Image

boisrondevens wrote:I love the idea of have the adapter on the left side but my problem is grease. I don't even like to touch my disc brake with my hangs by fear of putting grease on them. I can imagine the greasy chain splashing grease on them. Very clever idea but not practical for that aspect. My two cents
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Re: Belt or Sprocket Adapters ???

Postby sn0wchyld » Wed Oct 19, 2016 3:44 pm

boisrondevens wrote:I love the idea of have the adapter on the left side but my problem is grease. I don't even like to touch my disc brake with my hangs by fear of putting grease on them. I can imagine the greasy chain splashing grease on them. Very clever idea but not practical for that aspect. My two cents


yea i trialed it ona old set of pads, thinking that id have the same issue. been fine thus far, atleat 500km of riding. there;s a good 20mm seperating the sprocket and teh disk.
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Re: Belt or Sprocket Adapters ???

Postby neptronix » Wed Oct 19, 2016 4:40 pm

Thanks for the link! the picture of the black sprocket adapter was one i was selling. I'd commit a felony to get my hands on another one, but i'm sure i bought one of the last ones :cry: :cry: :cry: :cry:

The king's sales and service adapter is trash.. tried one.. threw it away.
That clamshell adapter mentioned earlier also only works on some bizarre single speed hubs.
The bicycle designer one you mentioned looks like the only legit option for now, and is worth a try.

Hugh-Jassman wrote:I really like this one. Does anyone know why it may not work?

like where can I get large sprockets for it? I need to do a 9:1 reduction so maybe a 144 tooth?

Looks like I will need a longer axle, about 1/4 inch?

http://www.bicycledesigner.com/rotor-and-sprocket-adapter.html


Image
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Re: Belt or Sprocket Adapters ???

Postby Hugh-Jassman » Wed Oct 19, 2016 5:14 pm

Now I am thinking that some one should make an adapter for motorcycle sprockets to go right onto a freehub body behind a cassette of a smaller kind. Like behind a 7 speed cassette?



neptronix wrote:Thanks for the link! the picture of the black sprocket adapter was one i was selling. I'd commit a felony to get my hands on another one, but i'm sure i bought one of the last ones :cry: :cry: :cry: :cry:

The king's sales and service adapter is trash.. tried one.. threw it away.
That clamshell adapter mentioned earlier also only works on some bizarre single speed hubs.
The bicycle designer one you mentioned looks like the only legit option for now, and is worth a try.
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Re: Belt or Sprocket Adapters ???

Postby Chalo » Thu Oct 20, 2016 1:02 pm

Given that the rear brake can only provide about 25 percent of maximum braking, why not just use a rim brake and have the rotor mount freely available for a sprocket? Trying to stack both of them on the same mount introduces spacing and contamination issues that will make a disc brake less effective than a rim brake anyway.

If the frame isn't equipped with brake bosses, a brake plate that has them is a simpler and easier machining project than a sprocket carrier for the rotor mount.
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Re: Belt or Sprocket Adapters ???

Postby MrDude_1 » Thu Oct 20, 2016 1:26 pm

Chalo wrote:Given that the rear brake can only provide about 25 percent of maximum braking, why not just use a rim brake and have the rotor mount freely available for a sprocket? Trying to stack both of them on the same mount introduces spacing and contamination issues that will make a disc brake less effective than a rim brake anyway.

If the frame isn't equipped with brake bosses, a brake plate that has them is a simpler and easier machining project than a sprocket carrier for the rotor mount.


I dont always agree with everything you say, but I agree with you here.
High quality pads on a rim brake would be much better than cramming a disc and caliper in a sprocket.
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