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Crank Shaft ABC Motorcycle information
- Peter Gillespie
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4 years 9 months ago #818
by Peter Gillespie
Replied by Peter Gillespie on topic Crank Shaft ABC Motorcycle information
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4 years 9 months ago #824
by Peter Gillespie
Replied by Peter Gillespie on topic Crank Shaft ABC Motorcycle information
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4 years 8 months ago #836
by Peter Gillespie
Replied by Peter Gillespie on topic Crank Shaft ABC Motorcycle information
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4 years 1 month ago #983
by Peter Gillespie
Replied by Peter Gillespie on topic Crank Shaft ABC Motorcycle information
If you have a spare crankshaft lying around please measure the center web thickness for me. Do not include the raised section around the journal in your measurement. Metric or imperial is fine.
There seems to be a big difference in the center web thickness. The earlier Crankshafts with the ( Square 20) quality stamp seem to be 11 to 11.2mm . The later with the (round 2 and round 3 )quality stamp seem to be thinner.
Please help me by measuring your Crankshafts if you have a spare and you can.
We will start the final machining on the Crankshafts this week and this dimension is important.
Regards
There seems to be a big difference in the center web thickness. The earlier Crankshafts with the ( Square 20) quality stamp seem to be 11 to 11.2mm . The later with the (round 2 and round 3 )quality stamp seem to be thinner.
Please help me by measuring your Crankshafts if you have a spare and you can.
We will start the final machining on the Crankshafts this week and this dimension is important.
Regards
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4 years 1 month ago #984
by TonyM
Replied by TonyM on topic Crank Shaft ABC Motorcycle information
Peter
I have two cranks . 0.445 inch and 0.438 inch both with 3 in a circle, taking account of the rust.
T
I have two cranks . 0.445 inch and 0.438 inch both with 3 in a circle, taking account of the rust.
T
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4 years 1 month ago #985
by Paul
Replied by Paul on topic Crank Shaft ABC Motorcycle information
Hallo Peter, Hallo All,
Is this just a ruse to see how many crankshafts we are hoarding?
Anyway, I have a shaft ("ex Geoff Moore") stamped variously with 3, 5, 6 (or is it 9?), and 7, all in circles. Plus 11 not in a circle, and several indentations, perhaps from hardness tests.
It's difficult to get a micrometer onto the centre web, but this one is 0.409", or 10.4 mm.
Sopwith crankshafts don't have a reputation for breaking, so I would think that a compromise of 10.5 mm./0.414" would be very safe.
Great stuff, Peter, let the lathes roll!
Is this just a ruse to see how many crankshafts we are hoarding?
Anyway, I have a shaft ("ex Geoff Moore") stamped variously with 3, 5, 6 (or is it 9?), and 7, all in circles. Plus 11 not in a circle, and several indentations, perhaps from hardness tests.
It's difficult to get a micrometer onto the centre web, but this one is 0.409", or 10.4 mm.
Sopwith crankshafts don't have a reputation for breaking, so I would think that a compromise of 10.5 mm./0.414" would be very safe.
Great stuff, Peter, let the lathes roll!
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