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Odd size allthread availability?

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Martin King 202/02/2021 18:57:17
984 forum posts
439 photos

Hi All,

would anyone know if it is possible to buy allthread rod in 7/32” x 28 tpi BSF?

cheers, Martin

Keith Long02/02/2021 19:57:03
877 forum posts
11 photos

I think you'll struggle. In Kempes Engineers Year Book for 1965 7/32 BSF is marked up as "to be dispensed with whenever possible". So if it was out of favour 55 years ago it's not likely to be stocked very much. The common sizes of 3/16, 1/4 and 5/16 are readily available according to a quick internet search.

Mike Poole02/02/2021 21:29:38
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Moderator
3306 forum posts
73 photos

That may be hard to find, I don’t know whether 1BA would of any help but it’s fairly close. No use of course if it has to fit other parts.

Mike

Robert Butler02/02/2021 21:53:35
384 forum posts
6 photos

Or if you have a lathe with a hollow headstock mandrel purchase a 7/32 BSF die from Tracy Tools and cannibalise a die holder to enable it to fit in a three jaw chuck, support in a suitable bush drilled in situ in the tool post. Lock in tailstock chuck to prevent rotation with tailstock unlocked and free to slide. The die plus cannibalised die holder is of little cost and subject to between centres distance enables you to produce whatever length and quantity you require. Go steady if you drive the mandrel other than by hand!!

Robert Butler

Georgineer03/02/2021 09:35:36
565 forum posts
32 photos

Can one ask why? It seems such an unusual thing to need.

George B.

JasonB03/02/2021 09:58:41
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22588 forum posts
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Posted by Georgineer on 03/02/2021 09:35:36:

Can one ask why? It seems such an unusual thing to need.

George B.

English plane makers like it.

As you are likely to just need short lengths why not get some 7/32" rod and a tailstock die holder and thread it under power a couple of inches at a time. Or find a man with a repetition lathe and coventry diehead.

 

Edited By JasonB on 03/02/2021 10:04:17

Andrew Johnston03/02/2021 10:24:56
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6575 forum posts
701 photos
Posted by JasonB on 03/02/2021 09:58:41:

Or find a man with a repetition lathe and coventry diehead.

Funny you should mention that. Appropriate Coventry diehead chasers seem to be available secondhand.

Andrew

Tim Stevens03/02/2021 10:27:16
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1587 forum posts

You might find it helpful to start with a length of 1/4" x 28 UNF studding (=allthread). Especially as UNF is current in the USA, and still around in GB. Running a tap down it should be easier than starting with 7/32" rod.

Cheers, Tim

Robert Butler03/02/2021 10:36:10
384 forum posts
6 photos

Or a die

Robert Butler

Tim Stevens03/02/2021 10:39:01
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1587 forum posts

Robert - you got me bang to rights. Whatever that might mean ...

Tim

Robert Butler03/02/2021 10:44:46
384 forum posts
6 photos

Tim - no problem - anything to include a bit of humour

Robert

Howard Lewis03/02/2021 11:15:57
6024 forum posts
14 photos

Tim,

You screwed up there!

If only a short length is needed, if it not available, as already suggested, make it.

A friend wanted a LH 1/2 UNC nut. Either not available or at RIDICULOUS prices, (£50+ each).

Having some hexagon bar, a set of Taps worked out much cheaper!

Howard

Martin King 203/02/2021 11:24:58
984 forum posts
439 photos

Hi All,

Jason has it right. It is common on many STANLEY planes and others. i need some length to remake knackered adjuster columns on some spokeshave adjusters etc.

i will try a hexagon die from Tracy tools then try to power thread some at low rpm in back gear. Another first for me!

Cheers, Martin

Howard Lewis03/02/2021 11:28:53
6024 forum posts
14 photos

use plenty of a suitable lubricant and you sgould be OK.

Go for it

Howard

Andrew Johnston03/02/2021 11:30:53
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6575 forum posts
701 photos
Posted by Martin King 2 on 03/02/2021 11:24:58:

i will try a hexagon die from Tracy tools then try to power thread some at low rpm........

Solid hexagon dienuts are intended to clean up existing threads, not cut new ones. Personally I no longer buy from Tracy Tools. Instead I'd look a for a quality make NOS die on Ebay.

Andrew

Martin King 203/02/2021 19:53:01
984 forum posts
439 photos

Andrew, Thanks for that info, will do.

Martin

John Reese06/02/2021 23:53:41
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1035 forum posts

I am surprised no one suggested single pointing the thread using a follow rest for support.

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