Never come across Whitworth Fine before - certainly not in any of my engineering guides. Whitworth is a coarse thread type under the British Standard family, BSW, BSF, BSCY, BSP, BSPT, BSB which have a 55 degree thread angle.
The UN range is the adopted American standard that uses a 60 degree thread angle.
It would be odd for the crank to be the only part of the car to use BS threads when the rest were UN (apart from odd small stuff that used BA).
Well it looks like many have been wrong for many years and like Dan says does bring into question the technical standard of some of the A series specialists.
However I am still on the side that Whitworth Fine is not a documented and standards accepted thread however some may have adopted the name. Whitworth was, afterall, a more commonly used reference than BS, especialy when it came to the spanners/sockets etc.for the thread (bit like may people wrongly describing UNx bolts by their spanner size).
In fact I would argue that BMC were wrong in saying it is a Whitworth form as it is BS form, of which Whitworth is also one. I would expect the correct name would be BSS (British Standard Special).
But then, what came first - presumably the Whitworth thread which was then adopted and then standardised as BS, otherwise BSW would simply by BSC(ourse) as with all the other standards based thread forms.
As you've brought this down to a name calling and c*ck jousting session - where in either of the above points (the only two I have previously made in this thread) was I wrong?
No-one is disputing you anymore that a Whitworth thread form was used. You've caused us to question what was widely accepted, go away and research it further and agree with your view, thoughts & sources of information. As such you have educated us all. Well done, consider your ego well and truely massaged.
You have not, and probably never will, convinced any of us that Whitworth Fine exists as a standards based thread. 5/8"x16tpi Whitworth form is a special, how people name it is purely down to each individual but calling it Whitworth Fine is misleading and not necessarily correct - Whitworth Special or British Standards Special makes much more sense.
As has been borne out in the various posts using Whitowrth Fine as a name will cause many to wrongly assume BSF is requried as that is the
standard fine version of a Whitworth thread form.
Oh and in the middle of all that you've managed to turn the thread into a medium to have a further stab at Calver - didn't see that coming (much). I think many would prefer it if you would take that personal battle home with your bat. No-one sees him as perfect but he does offer some good advice, I'm sure Vizard made and publicised (spelling?!
) some mistakes along the way. None of these people claim to be the God of all things Mini - that said you do give a 'I'm Holier than thou' impression in most of your posts that is very grating, but I suppose being humble is difficult when you're tantamount to perfect eh?
