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1p crank



 
 
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  #1  
Old February 27th 18, 12:15 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 820
Default 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

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  #2  
Old February 27th 18, 12:40 AM posted to rec.bicycles.tech
AMuzi
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Posts: 9,437
Default 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.

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www.yellowjersey.org/
Open every day since 1 April, 1971


  #3  
Old February 27th 18, 12:55 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 820
Default 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...

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underground experts united
http://user.it.uu.se/~embe8573
  #4  
Old February 28th 18, 05:47 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 820
Default 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  
Old February 28th 18, 06:38 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 9,437
Default 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  
Old February 28th 18, 06:53 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 820
Default 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  
Old February 28th 18, 07:02 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
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Posts: 820
Default 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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