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Rays
 Post subject: Re: Anyone know?
PostPosted: 03 Jul 2019 13:50 
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Joined: 11 May 2009 10:11
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Location: Melbourne (Aust)
9/16" can be 20 or 26TPI in BSC - I have several 40's era BSA's so have tripped over this in the past.

This particular thread chart is one of the few online that show both variations:
https://www.motalia.com/Html/Charts/cycle_chart.html

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rik
 Post subject: Re: Anyone know?
PostPosted: 03 Jul 2019 15:47 
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Joined: 06 May 2009 19:42
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Current ride: M2 Razorback
Location: Mouth of the Port in the Shire of Hamp
03 wrote:
Adam wrote:
Turns out my confusion has arisen from assuming that British Standard Cycle (BSC) thread is the same as Cycle Engineers Institute (CEI)! The Die I borrowed is etched as 'Cycle' as has 26tpi, this obviously must be CEI. You're advice about 'standard' cycle is spot on, as this is 20tpi.
I'm surprised that there's nothing mentioned in my Zeus book. Fire up the Myford!!! lOl

NOT IN THE ZEUS BOOK :!: :?:
:o

Nor is it in my Presto book....

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Adam
 Post subject: Re: Anyone know?
PostPosted: 03 Jul 2019 15:55 
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Rays wrote:
9/16" can be 20 or 26TPI in BSC - I have several 40's era BSA's so have tripped over this in the past.

This particular thread chart is one of the few online that show both variations:
https://www.motalia.com/Html/Charts/cycle_chart.html



That's handy having the same system using 2 sets of tpi! 😮 :rotfl: Thanks Ray's, I'll be printing that chart off for future reference👍........and people think Buells are odd with their mix of AF and Metric lOl

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rik
 Post subject: Re: Anyone know?
PostPosted: 03 Jul 2019 16:28 
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Joined: 06 May 2009 19:42
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Current ride: M2 Razorback
Location: Mouth of the Port in the Shire of Hamp
Adam wrote:
Rays wrote:
9/16" can be 20 or 26TPI in BSC - I have several 40's era BSA's so have tripped over this in the past.

This particular thread chart is one of the few online that show both variations:
https://www.motalia.com/Html/Charts/cycle_chart.html



That's handy having the same system using 2 sets of tpi! 😮 :rotfl: Thanks Ray's, I'll be printing that chart off for future reference👍........and people think Buells are odd with their mix of AF and Metric lOl

Cue discussion of crank rear thread on fwd BL A-Series engine....

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