Sturmey Archer gear info

Jul 14, 2009 11 Replies

Bit of a shot in the dark but.......



I'm looking for some small pinions for a one off project and it occurs to me that the planet gears from a S-A hub gearbox might just be around the right size. I has got to be 40 years since I took one of these apart so my memory is a little faded but I think there are 4 pinions around 3/4" diameter Can anyone who might just have some of they in their junk box please tell me the general dimensions?



Bore, face width, no of teeth and overall diameter are what I need to assess suitability.



TIA



Bob


If you've a defunct electric screwdriver, the gearbox in them is also epicyclic with sun-and-planet gears.

All my drills and drivers are still working but I suspect the gears might be quite a bit smaller than 5/8 - 3/4" diameter given the body diameter of typical drivers. If I come across a dead one I'll have look and see.

Bob

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reposted to a group where there will likely be a quick(er) answer...

Bob:

There's one in bits on the bench at work, one of my sons is playing around with some old bike bits he is clearing out.

I'll have a look in the morning, at the same time as I am looking for Tim's Makrolon!

Peter

-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk

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Measured with a ruler, so approximate: O/D 11/16" (over the tips of the teeth) I/D 1/4" width 5/16"

20 teeth

Sounds like 32DP then which matches the hobs I saw at the SA auction.

John S.

Andrew,

Thanks very much indeed!

Bob

Start here:

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BugBear

[measurements]

If that's right, I've got an old hosed S-A 3-speed hub that I took off a rescue bike, which you're welcome to strip down for any bits you can use.

If all else fails I will hob them for you Peter

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