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3mm pitch chain

Sprockets wanted

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steamdave17/04/2020 11:40:05
495 forum posts
39 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 entwistle17/04/2020 12:49:03
1459 forum posts

can you not make your own ?cheeky

DC31k17/04/2020 13:03:56
586 forum posts
1 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 Haine17/04/2020 14:27:34
4428 forum posts
264 photos

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

DC31k17/04/2020 16:58:36
586 forum posts
1 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.

JasonB17/04/2020 17:16:29
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I suggested that in a recent post here

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