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.