Myford ML4 Threads

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Oops ... I hadn't read that either.

MichaelG.

I have read the FORUM notes on BA threads, but it must be a pain to set your lathe up for screw cutting BA, being neither TPI nor any common metric pitch. Were / are special lathes made specifically for BA threads?
BobH

Following Michael Gs full title of the BA, I wonder if any body could name any other of their activites???????????

Some local (E Devon) reading revealed that on a whim they decided to measure the difference in tidal range between the mouth of the R Axe and Westquantoxhead on the N Somerset coast No particular reason just seemed an interesting thing to do..........

John

John Flack:

Apparently, the BA were treated to the reading of a paper on the making of triple surface-plates by none other than Joseph Whitworth at Glasgow in 1840.

Thanks to SillyOldDuffer and Michael Gilligan for their comments. I take the point about the material being threaded as, indeed, did JW himself. He stated in the following year that his proposed threads "are used in cast iron as well as wrought; and this circumstance has had its effect in rendering them coarser than they would have been if restricted to wrought iron."

I must now read the LAL/BA article in MEW 256.

Edited in vain attempt to remedy problem in quoting JF's post

Edited By ega on 13/06/2017 17:45:53

Before everyone became rich enough to think of a screwcuttign gearbox as being the norm even production lathes used changewheels. So setting up for BA wasn't much different to anything else.

How about Evolution, the Volt, the Ohm and the Ampere?

These days BSA aren't quite so leading edge but they remain the UK's chief promoters of science and technology in support of industry. Sadly they've always been resisted by the 'old ways are the best' crowd, and more recently by chaps who think it's more important to be in touch with feelings than it is to bother with facts.

Dave

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Try putting "british association for the advancement of science" [with the quote marks] in the search box for any decent library.

This one being my favourite: **LINK**

http://www.library.manchester.ac.uk/search-resources/

MichaelG.

Lehman Archer and B.A. Taps:

I enjoyed the article, particularly as it is based on original materal.

The quotation from the LA catalogue gives the BA thread angle as 47 degrees; I had always understood it to be 47.5 and wonder whether this is a typo or, perhaps, there was a further change to the specification.

BA threads have metric pitches and it is interesting to see that the catalogue also gives a TPI equivalent. On the accuracy point, I would have thought that introducing a 127T gear would have allowed theoretical perfection. Is the "correct to within 1/53,300th" a reflection of the then state of the relationship between inch measure and metric? I believe it is only relatively recently that the 1" = 25.4mm equivalence was settled.

To those who responded to the question I posed earlier I was asking who could "name" their activites NOT WHO IS GOOD AT LOOKING THINGS UP. If you answered from memory well done, but I assume that you are in a select minority

On a slightly different thread(?) I have always thought that the BA thread was more pleasing to the eye as were certain threads in the ME range

On the question of screwcutting perhaps given their age and the types of lathes available they were never intended for that purpose, hand use or specialist eg watchmaking eqpt. was envisaged

For those not conversant with BA certain of the odd number threads matched the Imperial rod size that was available in times past. LBSC made good use of this fact

John

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John,

I'm not really sure if your "shouting" was directed at me

Hopefully not, as I simply directed you to the wealth of information that is available.

... as you will see, it's a long list.

If you were "setting a test" then be assured that I have no intention of sitting it.

MichaelG.

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P.S. For info. ... The reason that UoM Library is my favourite point of reference is that I use the Elsevier Reading Room at John Rylands most Thursday afternoons. http://www.library.manchester.ac.uk/rylands/

Edited By Michael Gilligan on 14/06/2017 13:08:25

MichaeiG sir.....I neither shout or display bad manners my nanny was very strict on such matters.

I was suggesting that a majority may know nothing about the Association beyond taps and dies

If my comments have given offence may I offer my apologies and be assured that I will try to prevent such occurrences in the future

John

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John,

If you care to research "netiquette", you will find that the use of upper-case text is generally construed as "shouting".

Aside from that though ... your gracious apology is accepted and reciprocated.

MichaelG.

As it happens, I find the interaction between science and technology fascinating and have long known of them. Nothing wrong with being good at looking things up either: it's a valuable skill.

But I think you're making a different point. You're absolutely right to question if the BSA has the public's attention. I'd say they aren't as well known as they should be, particularly as they're meant to be banging the drum.

Dave

Sod .....thank you that's the point I was making.

I once attended a conference where the Publicity Officer was receiving a lot of "stick" unable to control his anger he grabbed the microphone and shouted "there's a lot of publicity going on that nobody knows about". That sort of sums up my knowledge of the British Association🙄