From: bobbyjoe@chartertn.net
Date: Fri Apr 25 2003 - 14:56:19 PDT
I don't really care which standard they go with, just use the one damn
system on the vehicle, don't use both.
BjP
----- Original Message -----
From: "Fred Martin" <mung@in-touch.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Friday, 25 April, 2003 5:47 PM
Subject: Re: [MV] The metric system in America
> Well, Ryan, if you want to talk about thread strength, why don't you
> mention about the buttress thread...it is about a 45* on one side and
> straight on the other side. Have you ever taken that old american made
> vice of yours apart to oil the threaded shaft in it? Well, a lot of 'em
> had butress threads because they don't get any atronger than that...or
> maybe you bought one of those foreign made ones...grin...they won't have
> them. Another one is the square thread (read strong) and the modified
> square thread which we call an acme. Some of the vices have it...and
> other things as well. We used to have to cut those acme threads in the
> bonnet (I think thats what we called it) of certain valves...sea water
> fire valves to be exact and they had a double pitch...in other words two
> threads wrapping around the shaft or inside of a hole. We always knew
> when one of those jobs came in the shop (older fellows) and if they
> assigned it to one of the young hotshots...some dude would wait till he
> was cutting inside of the hole and would take a 4 pound hammer and toss
> it in the air to land behind him on the steel deck. You better not be
> grinning when he turns around. Of course...no one knew anything. <G>
> Fred Martin
>
> Ryan M Gill wrote:
> > At 3:40 PM -0400 4/25/03, Fred Martin wrote:
> >
> >> Ryan...thats fine if someone wants a Brit car or a French car (I think
> >> they have a system called Lowenhurst(sp)in France) and if you get out
> >> the machinists handbook and look, there are other systems. Some of the
> >> engine lathes of today will cut SAE, metric and a system called
> >> modular...I don't know about this system... But we are
> >
> >
> > Whitworth is inherently stronger as it has better stress curves on the
> > threads compared to SAE. Its curved across the roots and crests of the
> > threads. Both BSF and BSW have a 55 degree pitch (UNF and SAE don't!).
> >
> > I don't really see how different thread rates make things hard. There
> > are short and long tons still now. People still sell wood by the cord,
> > wheat by the bushel, Nautical speeds are still Knots (not KPH) and most
> > things are still measured with ounces, pounds and tons.
> >
> > Metric isn't inherently better in any respect as far as measurements go
> > excepting for the ability to do easier math (is that a bonus or does it
> > promote dumb-ing down?).
> >
> > Perhaps I have to think in so many modes (there's also BA/British
> > Association for small machine screws) that I don't see the difficulty in
> > also thinking in metric when I'm working on my Honda's (3 Hondas, 1
> > Subaru, 1 Chevy, 2 Daimlers, and a shared Humber).
> >
> > To me, all it really means is that I need more tools...
> >
>
>
>
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