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From: "Alex Gibson"
Subject: Re: what is 100R mean in a schematics?
Date: Wed, 25 Dec 2002 00:04:41 +1100
Organization: ihug ( New Zealand )
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NNTP-Posting-Date: Tue, 24 Dec 2002 13:04:47 +0000 (UTC)
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"Rick Merrill" wrote in message
> William Meyer wrote:
> > Lewin A.R.W. Edwards wrote:
> Ah ha! I have a horror story: I'm working on this co-linear robotic arm
> machine tools and they tell me it's a 5 pitch screw and the original code
> (that didn't work) had "linear_pitch=5" so I let it be. But the system was
> never accurate over large distances. finally I measured diameters,
> counted gear teeth and then put
> a vernier caliper to the lead screw: it had a pitch of 5.0746 (my measure)
> per inch! It turns out to be a metric screw with a pitch of "5" , 5 mm
> per thread that is! So linear_pitch = 5.08 and now i'm right on the mark!
> There seems to be little incentive to make a wholesale conversion of
> > One thing that galls me is the increasing appearance of mechanical
products that contain threaded >>fasters of both Imperial and metric forms.
I suspect that the metric fasteners have been used as an >>alternative to
American fine pitch. It just makes it a PITA, having two sets of wrenches in
play on a >>single product.
I feel for the guys I used to work with who now have to have both
US and metric tool kits
as the airline has finally bought airbus to go with its almost totally
Things like torque conversions are the real PITA
going from foot or inch pounds to newton metres.
One industry though that is weird is astronomy some manufacturers
use both inches and millimeters.
Inches for sizes above one inch and millimeters for those
sizes below. Others use all US and use thousandths of an inch.
Then there are others all in the US who use only millimeters.
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