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3mm pitch chain

Sprockets wanted

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steamdave	17/04/2020 11:40:05
526 forum posts 45 photos	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
roy entwistle	17/04/2020 12:49:03
1716 forum posts	can you not make your own ?
DC31k	17/04/2020 13:03:56
1186 forum posts 11 photos	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 Haine	17/04/2020 14:27:34
5563 forum posts 322 photos	If you search online there's a website somewhere that says how to make your own cycle sprockets, iirc mainly by hand.
DC31k	17/04/2020 16:58:36
1186 forum posts 11 photos	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.
JasonB	17/04/2020 17:16:29
25215 forum posts 3105 photos 1 articles	I suggested that in a recent post here

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