3mm pitch chain

[steamdaveParticipant @steamdave]

I have a length of 3mm pitch roller chain and need two sprockets of 10 or possibly 12 teeth.

HPC gears list 4mm pitch as their smallest and a search on the internet doesn't reveal any other manufacturer of such a small chain or sprockets.

So over to the brains trust: any ideas on where to get the required sprockets?

Dave
The Emerald Isle

[steamdaveParticipant @steamdave]

Sprockets wanted

[roy entwistleParticipant @royentwistle24699]

can you not make your own ?

[DC31kParticipant @dc31k]

I do not think 3mm pitch chain is made under any international standard.

Somewhat confusingly, 03B chain in an ISO standard is 5mm pitch.

These people:

https://www.motionindustrial.co.uk/productcat/chains-sprockets/

say they can supply.

The only reference I found for 3mm pitch sprockets was for Chinese-made mini-motorbikes (pit bikes).

As Roy says, maybe make your own. Start with a decagon of 3mm side and go from there.

[John HaineParticipant @johnhaine32865]

If you search online there's a website somewhere that says how to make your own cycle sprockets, iirc mainly by hand.

[DC31kParticipant @dc31k]

Posted by John Haine on 17/04/2020 14:27:34:

If you search online there's a website somewhere that says how to make your own cycle sprockets, iirc mainly by hand.

Is it this one?

http://www.gizmology.net/sprockets.htm

If you are at all CAD-minded, download a dxf of a 6mm pitch sprocket of the correct number of teeth and scale by 50%. Add a few centres for the rollers, print out, stick to blank, drill, saw file, done.

[JasonBModerator @jasonb]

I suggested that in a recent post here

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