Smart and Brown Sabel

[old martParticipant @oldmart]

I think you should ditch the milling attachment, you have a proper mill sitting next to the lathe.

[Jim BeagleyParticipant @jimbeagley46363]

Posted by old mart on 03/07/2020 22:00:53:

I think you should ditch the milling attachment, you have a proper mill sitting next to the lathe.

Haha. Good spot. I got the vertical slide before the mill. I’ll keep it for now

[Alan HandsParticipant @alanhands91715]

Hi everyone really interested in this thtead as i have just bought this model !! quick question , what threads are used in the construction of the lathe , i want to clean out all the screw holes but do not have any imperial taps and dies yet, I assume the smaller threads are BA ?

Alan

[Martin ConnellyParticipant @martinconnelly55370]

I would expect 55° Whitworth threads for the majority. At a push 60° UNC may fit in worn holes where the diameter and TPI is the same. I don't know about anything smaller.

Martin C

[Alan HandsParticipant @alanhands91715]

Thanks for the info !! now i have a place to start

[old martParticipant @oldmart]

The model A has BSF threads rather than Whitworth and also BA in the smaller sizes. The spindle threads are 55 degrees.

[Alan HandsParticipant @alanhands91715]

i have the sabel exactly the same as jim's, so is that classed as the model A.

sorry for the dumb questions

[old martParticipant @oldmart]

No the model A is a bigger machine than the Sabel. Look at the "lathes UK" website.

http://www.lathes.co.uk/smartbrown/index.html

Edited By old mart on 11/03/2021 17:41:26

[Brian WoodParticipant @brianwood45127]

Alan Hands

Not a dumb question at all, the Model A was a different machine altogether, but it was made by Smart and Brown

Regards Brian

[Clive FosterParticipant @clivefoster55965]

As the Sabel is basically an improved, better built clone of the SouthBend 9" its easy to get a bit muddled up with model designations.

South Bends came in three versions model A with threading gearbox and power feeds, model B with power feeds change wheels for threading and model C with only plain hand feed and change wheels. Boxford were also clones and used the same model A-B-C identification system.

The Smart & Brown equivalents are SABEL with threading gearbox and power feeds, SAB with power feeds and change wheels for threading and S with only plain hand feed and change wheels.

So its an easy, and understandable, mistake to think Sable model A rather than the correct SABEL.

Which matters only because, as Old Mart says the Smart & Brown model A is very different being a true toolroom lathe and a much heftier beast. Although of similar capacity.

Clive

[Alan HandsParticipant @alanhands91715]

Thanks for all the info, very interesting. so back to my original query threads are bsw ???

[old martParticipant @oldmart]

You will have to unscrew something to find out whether the threads are bsw or bsf.

[Jim BeagleyParticipant @jimbeagley46363]

There’s a right mix on the machine Adam as a single thread form doesn’t fit all requirements.
I know there’s a lot of BSW, and as Old Mart says there’s also some BSF.
I wouldn’t be surprised to find some BSC in there as well.
The only simple way of knowing is to try and tap or a known bolt or to measure the bolt. 
Do you possess a thread gauge to get some TPI measurements?

The OD of the bolt is hopefully going to be very near the major diameter.

jim.

Edited By Jim Beagley on 11/03/2021 20:22:27

[Ebenezer GoodParticipant @ebenezergood76202]

That's a lovely looking lathe! my old Sable is resplendent in shoddy old silver hammerite maybe one day I'll treat it to a spruce up.

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