Go Back  Bike Forums > Bike Forums > Alt Bike Culture
Reload this Page >

Looking for the right sprocket

Alt Bike Culture Chopped, dropped, stretched, lifted, and otherwise cut up and put back together. The art and science of choppers, cruisers, lowriders and the vast world of mutant bicycles.

Looking for the right sprocket

Old 01-18-17, 07:03 PM
  #1  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Looking for the right sprocket

Hello Mutant Bike Builders,

I'm working on a pedal powered project and I'm trying to find as much "off the shelf" parts that I can to make it a reality. Basically the project will involve a bunch of pedalers inputting power to a shared driveshaft. The power from the driveshaft will be used to turn an assortment of kinetic sculptures. I'll use a one-way bearing in each person's driveline so coasting and back pedaling are smooth and comfortable.

Perhaps a chicken scratch sketch can help make more sense. I included a jpg attachment. Basically I need to couple a bicycle gear to a hub that can house the one-way needle bearing. However, I'm having trouble finding the right sprocket for the job. I'd love to keep everything to 1/8" bike chain, so I'd prefer not to use sprockets designed for fitting up motors, as they seem to require thicker chain.

Any help is appreciated. If my doodles aren't clear, I'm happy to try and explain what is going on.

Thanks!
cogzoid is offline  
Old 01-18-17, 07:04 PM
  #2  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Let me try uploading that jpg again...
Attached Images
File Type: jpg
20170118_164506.jpg (94.4 KB, 49 views)
cogzoid is offline  
Old 01-18-17, 07:07 PM
  #3  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Oh, and let me give a little background about myself. I've built other pedal powered devices before, but I've never found an elegant solution for this. I've got a fair amount of fabricating tools at my disposal (lathe, mill, welders, etc). I'm pretty much resigned to making the "hub" that attaches to the sprocket and that will house the needle bearing. But, I'm looking for a the right sprocket that I can attach to it.
cogzoid is offline  
Old 01-18-17, 07:56 PM
  #4  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
After spending more than a few days googling and failing to find what I need, I naturally found a pretty decent solution right after I posted this. I'm going to turn down a hub that is 1.375 x 24 Pitch on the lathe (I always enjoy an excuse to single point thread) and I'll be able to use a freewheel that mounts onto the hub. I can drill out the hub to whatever size of shaft I decide to go with. It won't be as quiet as the one-way needle bearings, but at least it's a nice compact off the shelf solution. So you can safely ignore this thread, unless you have a great idea anyway.

Thanks!
cogzoid is offline  
Old 01-19-17, 09:21 AM
  #5  
Philphine
Senior Member
 
Join Date: Dec 2007
Posts: 777
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 77 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
no idea to add, but I want to see whatever you do.
Philphine is offline  
Old 01-21-17, 09:49 AM
  #6  
frameteam2003
Senior Member
 
Join Date: Feb 2005
Location: Pleasanton Tx
Posts: 1,214

Bikes: old,older.and very old

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Or you might try a freewheeled BB--schwinn used them on some of their bikes.
frameteam2003 is offline  
Old 01-22-17, 04:56 PM
  #7  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If the freewheels are on the bottom bracket then when someone cranks their pedal all of the chains will have to move. I'd rather have the freewheel part isolating as much of the drivetrain as possible. It's not much but it will all add up.

I'll keep a freewheeling BB in mind for future projects though.
cogzoid is offline  
Old 01-24-17, 11:52 PM
  #8  
jumpmissrestart
Junior Member
 
Join Date: Jan 2017
Location: PNW
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Like the other guy I have nothing more than my interest to add. Please return with pictures!
jumpmissrestart is offline  
Old 02-09-17, 10:04 AM
  #9  
reddog3
Senior Member
 
Join Date: Nov 2010
Location: River City, OR
Posts: 672
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You might take a look at Sick Bike Parts . They have freewheel adapters for jackshafts- freewheel adapted cranks. sprocket and cog adapters, etc. You might find what you need without the machine work, except for maybe boring for shaft size.
reddog3 is offline  
Old 02-13-17, 01:09 PM
  #10  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Great suggestion, Reddog!

I was able to turn a part that will work for my prototype, but they sell the exact same thing I made for $17. I'd rather spend my time fitting everything together and figuring out the hard parts, so every part I can find off the shelf is a good thing!
cogzoid is offline  
Old 02-14-17, 07:05 AM
  #11  
100bikes
Industry guy
 
Join Date: Nov 2007
Location: Minnesota
Posts: 123

Bikes: To many to name - I ride a custom built steel frame.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
What does the shaft look like?

I have a number of single freewheels, meant for tricycles I believe.
They have a circular hole and machined slot, meant for a key arrangement.
If your pedalers are all on one side, they would mount one way, if they are opposite you flip them over.

How many drives do you anticipate.
100bikes is offline  
Old 02-14-17, 09:30 AM
  #12  
cogzoid
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
All of the pedalers will be feeding into a 5/8" keyed shaft. They'll all be on one side in this arrangement. Everyone will be seated at a fully functioning bar while they pedal, hopefully buying drinks and having a great time. I'm not sure how many pedalers I need. I'm going to knock together a prototype to demonstrate the principle with 2 pedalers, but the final bar will probably need something like 6 or 8.
cogzoid is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.