That's terrific, I like it....it MUST be correct!
So I then google for 'whitworth' and come up with the page
www.team.net/sol/tech/whitworth-hist.html
And there we have it: BA = "british association", and THOSE puppies have a
47-1/2 degree thread angle! And there's more, but you should look yourself,
I'm laughing too much to type anymore.
george
-----Original Message-----
From: Stephen Hanselman [mailto:tr6@kc4sw.com]
Sent: Tuesday, May 27, 2003 3:48 PM
To: Loriot, George; Lumia, John; dmallin@attglobal.net; 6pack
Subject: RE: Accelerator shaft bushings
I couldn't resist.
"BA" should be familiar to anyone who has worked on a house. it means "British
Average" sort of like a carpenter who says "1/2 inch, that's close enough"
Steve
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net]On
Behalf Of Loriot, George
Sent: Tuesday, May 27, 2003 8:20 AM
To: Lumia, John; dmallin@attglobal.net; 6pack
Subject: RE: Accelerator shaft bushings
Just thought I'd add my $.02. When I first saw this I thought 'british? BA?
Must be that weird size of thread called 'BA', stands for 'British
<something>', in the same class as BSW (British Standard Whitworth' and BSF
"British Standard Fine". These were the strangely sized bolts with a 55 degree
thread angle, instead of 60 degree, with rounded peaks and valleys on the
threads. So even though the sizes were in inches, and the threads per inch
were in inches, the angle of the threads were just far enough off to completely
mess you up if you tried to use an american size. It would begin to thread and
then lock up when the thread angle mismatched. Applying extra torque would
strip the threads. BA was in the same 'can't use anything else' category, for
very small fasteners such as internal instrument screws and points adjustment
screws. I believe they were actually measured in
millimeters, but no standard metric screw would mate with them. These were
the things to have !
for Brit motorcycles up to the early 1970's as I recall. As I understand it,
this series of thread size was invented by the Brits for early locomotives, in
the mid 19th century. They persisted, as least for motorcycles, for over 100
years.
And now it looks like BA in this thread was meant to mean Big A-- instead, not
'British <something>'.
George Loriot
1976 TR6 without a single Whitworth or BA thread.
-----Original Message-----
From: Lumia, John [mailto:jlumia@ball.com]
Sent: Tuesday, May 27, 2003 10:55 AM
To: dmallin@attglobal.net; 6pack
Subject: Re: Accelerator shaft bushings
Al, Don, I believe the saying is "Big A** screwdriver". Who ever comes up with
these phrases (no please lets not start another thread similar to churchkey)?
Anyway, I was trying to suggest that a big screwdriver with large blade would
have less chance of puncturing the seal than a SA (Small
A** of
course) screwdriver. John - 1976 TR6
Date: Sat, 24 May 2003 10:11:28 -0400
From: Don Malling <>
Subject:
I'll second the bite -- what's a BA screwdriver?
Don Malling
Alan wrote:
> ok,
> I'll bite,, whats a BA screwdriver?
> Al
> ----- Original Message -----
> From: "Lumia, John" <jlumia@ball.com>
> To: <ngwehmeyer@attbi.com>; "6pack" <6pack@autox.team.net>
> Sent: Friday, May 23, 2003 10:38 AM
> Subject: Re: Accelerator shaft bushings
>
>
>
>>Neil, recently I mounted each bushing on wooden stick and heated the
>
> bushings
>
>>using a hair dryer for about a minute and that softened them up
>>nicely.
>
> Then
>
>>I used a BA screwdriver to push em in. Seems to work ok, you just
>>need to move fairly quickly. As in using any of the wifes things on
>>our cars,
>
> just
>
>>dont let her catch you doing this!
>>
>>John - 1976 TR6
>>
>>Neil wrote:>
>>So I got these neat new accelerator shaft bushings in the mail today
>>from TRF. Has anyone ever figured out how to fit these things into
>>the holes they belong in? I tried heating them in boiling water, but
>>no luck.
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