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Re: introduction + Catalina air box [Re: vintagebike] #796384 01/23/20 1:20 pm
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If you are willing to make two more of those "domed" knobs to hold the cover on the air cleaner, I need them for MINE.

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Re: introduction + Catalina air box [Re: vintagebike] #796399 01/23/20 5:10 pm
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I like your plan to build an ISDT replica. Those machines were an interesting slice of the BSA history where the lads were showing how tough they were to handle such a heavy machine and where the machines showed how tough they were.

Nice work.

Gordo


The roadside repairs make for the best post ride stories.
Re: introduction + Catalina air box [Re: Irish Swede] #796456 01/24/20 6:37 am
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Originally Posted by Irish Swede
If you are willing to make two more of those "domed" knobs to hold the cover on the air cleaner, I need them for MINE.


i can do it, if you have a little patience.. but only in aluminium. my small lathe is not able to make the crosses in steel.

Last edited by vintagebike; 01/24/20 6:39 am.
Re: introduction + Catalina air box [Re: vintagebike] #796492 01/24/20 9:08 pm
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Aha, an ISDT Gold Star, what a brilliant idea. All the more fitting since Germany has had such a great track record in the ISDT.

Your bike looks great, congratulations.

Regarding the knurled knobs for the airbox; Be careful what you offer, you may get many more orders, including one from me.

Re: introduction + Catalina air box [Re: vintagebike] #796537 01/25/20 11:41 am
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Thanks for the positive reactions.
I can make some of the nuts but not a lot. It may take a while because i can only work in my garage at the weekeds.. I´d need the original thread size. I made my nuts in 1/4 BSC but i could imagine it´s original UNF?

Re: introduction + Catalina air box [Re: vintagebike] #796562 01/25/20 5:30 pm
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Originally Posted by vintagebike
I made my nuts in 1/4 BSC but i could imagine it´s original UNF?
I’m at airport so not easy to search but originals not 1/4”. Either 0BA or 2BA.

Re: introduction + Catalina air box [Re: vintagebike] #796622 01/26/20 4:04 am
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I would doubt they would be UNF. I might be wrong, but I don't think there were any Unified threads on the BSA's of the era!


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
Re: introduction + Catalina air box [Re: Kerry W] #796656 01/26/20 5:23 pm
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Thanks MM, i did not expect a BA thread.. maybe you can tell if it´s 0 or 2BA?
When was the unified thread introduced? For me as a metric guy it´s not so easy to handle the different "inch based threads".

Re: introduction + Catalina air box [Re: vintagebike] #796659 01/26/20 6:02 pm
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Originally Posted by vintagebike
it´s not so easy to handle the different "inch based threads".
Actually, BA is a "metric-based" thread based on a 6 mm fastener with 1 mm pitch. However, it is implemented in a seemingly-odd way with the pitch of the BA series 1 mm × (0.9)BA no.. This makes for a smooth progression with smaller diameters and each successive pitch 10% finer than the one before. Although the 47½° thread form is different than the 60° metric, this means the dimensions of a 0 BA fastener are a very-metric 6 mm with 1 mm pitch. After that, though, they go off the rails.

This means that, despite the difference in thread form, you would have been in luck if the nuts were 0 BA Unfortunately, they're 2 BA, which means the pitch is 1 mm × (0.9)2 = 0.81 mm. The diameter is ~4.6 mm.


Re: introduction + Catalina air box [Re: Magnetoman] #796661 01/26/20 6:24 pm
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Thank you, I have a set of BA taps and dies from 0-10BA. But i didn´t know that 2BA thread was used on this fastener.

Re: introduction + Catalina air box [Re: vintagebike] #796667 01/26/20 6:56 pm
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https://www.ring-plug-thread-gages.com/ti-N-vs-UN.htm


The “UN” thread form was developed after World War II by representatives of Great Britain, Canada, and the United States of America, to prevent recurrence of the wartime difficulties in supplying fasteners and tools in both British Standard Whitworth and US Standard configurations when and where needed. In 1949, after years of committee meetings between Canada, England and United States of America the American National Standard Series was replaced with the Unified Inch Standard Series.

Re: introduction + Catalina air box [Re: kommando] #796929 01/29/20 7:55 pm
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@ Irish Swede
@ NYBSAGUY

Today i started making 4 of these nuts, so i need the information from you, which thread size you need. The 2BA or an other size?

[Linked Image from s19.directupload.net]

[Linked Image from s19.directupload.net]

Re: introduction + Catalina air box [Re: vintagebike] #796934 01/29/20 8:52 pm
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This is extraordinarily generous of you, and I will find a way of remunerating you appropriately. I will be in my garage at the weekend, and I will measure the threads then.

Thank you.

(look for PM as well)

Re: introduction + Catalina air box [Re: vintagebike] #796997 01/30/20 1:31 pm
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To: Vintage Bike:

I will get over to my shop today and measure those threads.
I will then get the information to you.

THANKS!

Re: introduction + Catalina air box [Re: vintagebike] #797016 01/30/20 5:01 pm
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1038 are seldom seen but 1036 are around and work fine. Hard parts to get are the slides. You can get brass reproduction slides but they are costly.


Laurence Luce
Re: introduction + Catalina air box [Re: vintagebike] #797152 01/31/20 11:26 pm
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I have checked the threads for the two knobs on my Catalina air box.

Those threads are 2BA.

Please send me a private message, advising me of the price for two of these knobs, and postage cost to send them to me.

THANKS!

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