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AF hex?

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Axel	17/11/2016 17:15:25
126 forum posts 1 photos	I simply desire to know what AF means. I read in an instruction that the part is made from 4mm AF hex?
Andy Holdaway	17/11/2016 17:21:nineteen
167 forum posts 15 photos	I've always understood AF to mean 'Across Flats', but I stand to be corrected by those with a greater knowledge than mine! Andy
John Rudd	17/11/2016 17:25:xi
1452 forum posts ix photos	Axel, It but means 'across flats'.....the distance between 2 parallel sides.then in your example you demand some hex bar that is 4mm across from ane flat face up to opposing one.... Its every bit simple equally that......
Axel	17/11/2016 17:29:37
126 forum posts 1 photos	Thanks too all, I just figured it out myslef really! (Non too stupid after all!)
Tim Stevens	17/11/2016 17:32:46
1528 forum posts	A sure candidate for the proposed Glossary Cheers, Tim
stevetee	17/eleven/2016 xix:xix:34
143 forum posts 14 photos	As we are on the subject of 'beyond flats' does anyone know how the rather odd Whitworth hexagon sizes came virtually . I genuinely don't know but I exercise know 2 things 1/ whit head sizes were reduced in the war to the 'adjacent size down' bsf sized hexagons. 2/ whit BSF hex sizes match neither metric or majestic ' whole' sizes , so for example 5/xvi bsf has a hex size a picayune bigger than 1/ii" merely bigger than 13mm, but smaller than 14mm or nine/16.
Brian Oldford	17/11/2016 19:26:06
686 forum posts eighteen photos	I'yard unsure why BSW spanners are the sizes they are but in trying to find an answer I came across this at http://www.sat.dundee.air-conditioning.uk/psc/spanner_jaw.html "Information technology is a common view that the odd Whitworth/BS spanner sizes are 'casuistic' and that the newer metric organisation is much more 'logical', but consider this: To cover 1/4" to 3/4" in both fine (BSF) and fibroid (BSW) threads, the British arrangement defines 9 diameters and requires nine spanners (or 10 if you lot also include the original large head Whitworth sizes as well). The UNF/UNC system defines 8 diameters for the same range but requires xi spanners. For the broadly equivalent range in metric of M6 to M18 using all the mutual metric standards in use, there are 8 diameters defined merely a full of 15 spanners are required! (i.due east. 69% more spanners per diameters than the British arrangement). Is this progress?"
stevetee	17/11/2016 nineteen:41:52
143 forum posts fourteen photos	I came upwardly with these tables which evidence the 'irrational' whitworth /BSF hex sizes. I seem to recall that , certainly at one time, getting hexagonal bar in 'whitworth ' sizes was non an problem. We certainly had it in school early 1970's, and after when I worked in engineering . http://www.oldengine.org/members/diesel/Tables/WhitAF.htm LINK Edited By stevetee on 17/eleven/2016 19:47:28
Chris Evans 6	17/xi/2016 19:51:45
2024 forum posts	Hexagonal bar in whitworth sizes is withal bachelor. Some sizes as mentioned are close to other nominal sizes iii/16 W one/4 BSF are 0.440" A/F the next size up is 0.525" A/F other oddities follow. I think the original thinking was every bit a ratio of the shank diameter.
Neil Wyatt	17/11/2016 21:42:56
Moderator 18937 forum posts 734 photos 80 manufactures	Posted by Tim Stevens on 17/11/2016 17:32:46: A sure candidate for the proposed Glossary Cheers, Tim The glossary has attracted minimal contributions Different the 'alternative' version proving our forum members have better noesis of workshop esperanto than whatsoever other workshop linguistic communication Neil
Michael Gilligan	17/11/2016 21:53:29
19722 forum posts 1012 photos	Posted by Neil Wyatt on 17/11/2016 21:42:56: The glossary has attracted minimal contributions . Perchance your publishers were right [information technology's all on the internet] ... if only y'all can detect information technology. MichaelG.
Hevanscc	17/11/2016 22:39:23
89 forum posts 33 photos	Posted past stevetee on 17/eleven/2016 19:19:34: Equally we are on the subject of 'across flats' does anyone know how the rather odd Whitworth hexagon sizes came near . I genuinely don't know but I do know 2 things ane/ whit head sizes were reduced in the war to the 'next size down' bsf sized hexagons. 2/ whit BSF hex sizes friction match neither metric or imperial ' whole' sizes , so for instance 5/16 bsf has a hex size a piddling bigger than ane/ii" but bigger than 13mm, but smaller than 14mm or ix/sixteen. This has perplexed me as well. Found this explanation on the intenet at http://www.enginehistory.org/british_fasteners.shtml The derivation of Whitworth wrench sizes is another obscure mystery. From a Jaguar enthusiasts' web site LINK "...the hex sizes were originally governed past the commercially available steel hex bar stock sizes, in the days before automated screw machines, when basics and bolts were cut from hex bar stock."
Clive Foster	17/11/2016 23:32:00
3035 forum posts 106 photos	My understanding was that Whitworth sized his hexagons so they could exist produced reasonably easily from nomial fraction sized circular bar stock. Probably by forging or rolling down as machines able to cut round down to size in production quantities were not mutual when he start promulgated the standards. The big hexagons of the original Whithworth sizes appear to exist derived from some intuitive internal stress assessment based on relative depth of thread and the amount of metal betwixt the thread and the hexagon. Big heads being desirable anyhow when bolting timber or not too accurately finished plates and beams together as was very mutual then. We tend to forget how much and how apace basic stock material size and finish changed between Whitworths day and WW1 or thereabouts. From the viewpoint of the amateur and producers of modestly engineered componets series production WW1 standards are pretty much practiced plenty. Simply a lot more expensive (relatively) to achieve then. General country of the fine art in Whitworths time could be adequately, by todays standards, said to be "Gwad, that's rough, real crude.". The loftier priced, highly finished "artistic" products of clockmakers et al being totally atypical. We get a distorted view of the quality of things produced in the past because all the ordinary inexpensive stuff that nigh folks had to utilize fell autonomously and was binned long earlier the antique and similar vitrify were born. clive
Brian Bakery 1	18/11/2016 07:29:25
191 forum posts 36 photos	American fred?
Ian S C	18/xi/2016 09:35:45
7468 forum posts 230 photos	I call up you'll detect that the "original" Whitworth had square nuts, and bolt heads, and these were forged past the black smith. Ian Southward C
MW	18/eleven/2016 xi:02:42
2051 forum posts 51 photos	Posted past Ian S C on 18/11/2016 09:35:45: I think you'll discover that the "original" Whitworth had foursquare nuts, and bolt heads, and these were forged by the black smith. Ian S C Very much similar the old coach bolts that riddle my garden shed, they await forged. Michael W