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What was the thinking behind BA threads

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JerryNotts:
I know this is a very old thread, but perhaps we have been guilty of reversing the thought process.
My mind has been choking on this problem since the original question.

Surely the inch goes back in history long before the metre was dreamt of. No attempt to respect the ancients was made.

Jerry :doh:

rklopp:
Does anyone sell “real” taps and thread cutters in BA, like form taps, spiral flute taps, spiral point taps, and thread mills (single or multi-profile)? I’ve never seen them in the US. BA provides no advantages and many disadvantages compared to ISO and ANSI threads in terms of both fastener and tooling availability.


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awemawson:
I think personally BA are only useful to me for repairing equipment that already uses them. My rack of BA threads in drawers in reasonably extensive but not often used. Though I wouldn't throw them out!

But I also think that the head forms that BA have historically come in look FAR better than modern ones on instruments - proper Cheese Heads, Domed Countersunk etc and all Slotted rather than cross point / pozi drive etc.

Dell:
Hi all
I know this is an old thread (excuse the pun ) but I restore antique french and German clocks and a lot of people seem to think that they used metric screws and threads being European but in reality they are BA and as BA is based on the mm there is not much difference, also there are still a lot of supplies available.
Dell

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