topic Re: How to construct a bicycle chainwheel? in Fusion Design, Validate & Document Forum

How to construct a bicycle chainwheel?

andreas.scheucherautodesk.hobby — Sat, 29 Jul 2023 19:17:50 GMT

Hi,

I found some youtube tutorials for sprockets, but nothing really good for a chainwheel where I only know the inner diameter and the tooth count.

Do you know a tutorial how to construct one?

Thanks for your input.

Andreas

Re: How to construct a bicycle chainwheel?

jhackney1972 — Sat, 29 Jul 2023 19:57:18 GMT

You will need the Pitch Circle diameter of the sprocket in order to model. This website, at the bottom, will help you calculate this. After that search the internet for help with tooth shape. i do not know what you are referring to when you say you have the "inner" diameter. If you are talking about the Pitch Circle diameter then forget this site.

As for as videos on Chain Sprocket design, you probably cannot beat Lars Christensen YouTube video.

Re: How to construct a bicycle chainwheel?

andreas.scheucherautodesk.hobby — Sat, 29 Jul 2023 21:01:37 GMT

Hi @jhackney1972 !

Thanks, this video looks much better!

With inner diameter I mean the bottom of the cutout for the chain bolt. I know, creative naming. I hope you know what I am talking about... that was the easiest to measure.

But given all bicycle chains have the same link length, with trigonometry it should be possible to cut the circle in 2x24 triangles and calculate the lengths of the sides of it... But I guess this is an exercise for another day! 😄

I will give it a try tomorrow.

Re: How to construct a bicycle chainwheel?

jhackney1972 — Sat, 29 Jul 2023 21:05:35 GMT

If my Forum post solved your question, please select the "Accept Solution" icon to do three things. First it allows others to find a solution to a similar question, two, it closes the Forum post and last, it acknowledges that you accept the solution given. If you need further help, please ask.

Re: How to construct a bicycle chainwheel?

Warmingup1953 — Sat, 29 Jul 2023 21:20:33 GMT

Do you mean what I call the Chainring?

Re: How to construct a bicycle chainwheel?

andreas.scheucherautodesk.hobby — Sat, 05 Aug 2023 09:37:41 GMT

Exactly! Yes, you are right. Chainwheel was the wrong therm. Non native here...

Though your's is even a special case, as it's a narrow wide chainring.

Re: How to construct a bicycle chainwheel?

andreas.scheucherautodesk.hobby — Sat, 05 Aug 2023 09:40:13 GMT

I still haven't found time to test your solution, as this is just a side project of mine. But I will accept it as solved and ask again, when it give it a try and can't solve it with your suggested video and page.

Thanks so far!