#1
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1p crank
Here is a good image of the/a
one piece crank [1]. I have a couple of such from Japan and Taiwan and they seem to be 100% interchangeable down to the last washer. What I can see they are also identical to the one depicted, only sometimes there is a big washer/spacer between the chainring/sprocket and the stationary cone, and they have a large dustshield between the adjusting cone and the lockwasher. The locknut is sometimes 31mm which is a rare combination spanner size. More often they are 32mm tho. [1] http://user.it.uu.se/~embe8573/bike/1p-crank.jpg -- underground experts united http://user.it.uu.se/~embe8573 |
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#2
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1p crank
On 2/26/2018 6:15 PM, Emanuel Berg wrote:
Here is a good image of the/a one piece crank [1]. I have a couple of such from Japan and Taiwan and they seem to be 100% interchangeable down to the last washer. What I can see they are also identical to the one depicted, only sometimes there is a big washer/spacer between the chainring/sprocket and the stationary cone, and they have a large dustshield between the adjusting cone and the lockwasher. The locknut is sometimes 31mm which is a rare combination spanner size. More often they are 32mm tho. [1] http://user.it.uu.se/~embe8573/bike/1p-crank.jpg Crank shown is different, being 28tpi. The others are 24tpi. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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1p crank
AMuzi wrote:
Crank shown is different, being 28tpi. The others are 24tpi. OK, that's a pretty important difference No I was thinking more as a guide to putting them together... -- underground experts united http://user.it.uu.se/~embe8573 |
#4
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1p crank
AMuzi wrote:
Crank shown is different, being 28tpi. The others are 24tpi. Is this the same old English "Imperial" system? 24tpi = 24G Whitworth 55 deg? Sure looks like that... And yes, I counted the Taiwanese crank has 6 threads for 4/16" or 24tpi as you say. -- underground experts united http://user.it.uu.se/~embe8573 |
#5
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1p crank
On 2/27/2018 11:47 PM, Emanuel Berg wrote:
AMuzi wrote: Crank shown is different, being 28tpi. The others are 24tpi. Is this the same old English "Imperial" system? 24tpi = 24G Whitworth 55 deg? Sure looks like that... And yes, I counted the Taiwanese crank has 6 threads for 4/16" or 24tpi as you say. No. They are American SAE 60-degree thread. p.s. You need a set of thread gauges: http://toolguyd.com/blog/wp-content/...itch-Gauge.jpg -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#6
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1p crank
AMuzi wrote:
No. They are American SAE 60-degree thread. p.s. You need a set of thread gauges: http://toolguyd.com/blog/wp-content/...itch-Gauge.jpg I have one, but only for Metric 60 and Whitworth 55. The Whitworth 55 24G blade looks like a very good fit to the crank thread but having it perpendicular and holding the crank and thread gauge to a light bulb I do see some light shining thru so perhaps that's it? BTW why are the Japanese and Chinese/Taiwanese using a US system? Not that there is anything wrong with that! Only the English system is everywhere I can understand because of them pioneering manufacture/industrialism... -- underground experts united http://user.it.uu.se/~embe8573 |
#7
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1p crank
The Whitworth 55 24G blade looks like a very
good fit to the crank thread but having it perpendicular and holding the crank and thread gauge to a light bulb I do see some light shining thru so perhaps that's it? I just now did the same thing with an M8 bolt and the metric 1.25 pitch blade from the same thread gauge and there were light there as well, just a little but still, so perhaps one shouldn't use that method when in doubt... -- underground experts united http://user.it.uu.se/~embe8573 |
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