Odd size allthread availability?

[Martin King 2Participant @martinking2]

Hi All,

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

cheers, Martin

[Martin King 2Participant @martinking2]

[Keith LongParticipant @keithlong89920]

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 PooleParticipant @mikepoole82104]

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 ButlerParticipant @robertbutler92161]

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

[GeorgineerParticipant @georgineer]

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

George B.

[JasonBModerator @jasonb]

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

[Anonymous]

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 StevensParticipant @timstevens64731]

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 ButlerParticipant @robertbutler92161]

Or a die

Robert Butler

[Tim StevensParticipant @timstevens64731]

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

Tim

[Robert ButlerParticipant @robertbutler92161]

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

Robert

[Howard LewisParticipant @howardlewis46836]

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 2Participant @martinking2]

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 LewisParticipant @howardlewis46836]

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

Go for it

Howard

[Anonymous]

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 2Participant @martinking2]

Andrew, Thanks for that info, will do.

Martin

[John ReeseParticipant @johnreese12848]

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

[Author]

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