I seem to recall that the SU's on the TR3 have some Whitworth fasteners.
Jack
TR's 3&8
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Gerald Brazil
Sent: Saturday, July 07, 2007 11:31 AM
To: 'David Scheidt'; 'Randall'
Cc: 'Shop-Talk List'
Subject: Re: [Shop-talk] Metric Hardware
By the time the TR 3 was being made the Brits had converted to something
other than Whitworth. As far as I could tell when I restored my TR 3, SAE
bolts and nuts worked just fine....there was only one place that I actually
found one of those weird Whitworths....it was the bolt and nut the held the
big cable to the starter....there is a "Lucas Legend" about that.
As the story goes, when the Allies were liberating France, the found a
warehouse that had a huge supply of NOS starter lugs (apparently some Frog
had screwed up an order and put a few to many zeros in the order and they
had hidden the mistake in some obscure warehouse).....Lucas "made a deal" on
the lot and continued to use them as long as the inventory lasted. I
understand from friends who have resorted newer Triumphs that they lugs were
still common on Lucas starters until the 70's.
I can't guarantee the truth of this, but it sound like a plausible Lucas
story....
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of David Scheidt
Sent: Saturday, July 07, 2007 1:58 PM
To: Randall
Cc: Shop-Talk List
Subject: Re: [Shop-talk] Metric Hardware
On 7/6/07, Randall <tr3driver@ca.rr.com> wrote:
> > It's actually more complicated than that, though. The bolts that we
> > call "Whitworth" on our LBCs aren't really. They're British Standard
> > Whitworth (BSW), or British Standard Fine (BSF).
>
> Except the ones that are British Association (which on a TR3 is the
> majority of the "Whitworth" threads).
>
> > So a 1/4-20 whitworth bolt has a head that you'd find on a 5/16 BSW
> > or BSF bolt,
>
> Are you sure about that ? My understanding is that a 1/4 BSW bolt has
> a larger head than a 1/4 BSF bolt. IOW, BSW is effectively the same as
> the earlier "Whitworth" (in much the same way as UNC is the same as
> NC).
>
> See, for example,
> http://www.internationalcockpitclub.org.uk/articles/article_threads.ht
> m
It's my understanding that BS 1083:1965 says BSW and BSF bolts and nuts of
the same diameter have the same size hex. I don't have a copy of the
standard, though, and I'm relying on Industrial Press to get things right.
There's a table of sizes on page 1572 of the 27th edition.
--
David Scheidt
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