How can I create bicycle gears that have different numbers of teeth but all have an intertooth distance (distance between the teeth centres) of 12.7mm?
My attempt at a solution and problems encountered:
I made a bicycle gear by patterning a small circle around a large circle then trimming lines (see attached sketch), but this method requires me to estimate the diameter of the large circle before patterning and then keep modifying this slightly until I get an intertooth distance as close as possible to 12.7mm. So I can't get exactly 12.7mm. In my sketch I have labelled this intertooth distance I refer to by construction lines.
Thanks in advance.
Solved! Go to Solution.
Why not use the Roller Chain Spocket Design Accelerator?
In any case, I would not create a complex sketch like that.
It is better to pattern features than to pattern sketch.
If you Right Mouse Button - Show All Constraints - you will see that there are too many constraints that would have to be solved.
I also need to model a specific chain type. .
What is the chain type?
You could examine the attached file and alter it (or start from scratch) using the basic technique.
A Shimano CN HG94 chain. It's a very narrow chain and is also not symetrical. I might just pick the narrowest chain with 12.7mm pitch that the design accelerator offers.
Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register