Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw, NOW Clocks/Watches

Hi Al,

This is, of course, another distinction which I overlooked in my reply to
Alan. A watch has to be designed to operate in a really hostile environment
for anything mechanical. When you consider the nature of the timekeeping
element - an oscillating balance wheel with a mass of maybe 1/2 gram and the
kind of variations in accelleration of its supporting structure it has to
endure - perhaps on the wrist of a tennis player? and yet it has to maintain
an exactly constant oscillation rate......

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Al Lenz" <alenz@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: 11 January 2001 04:59
Subject: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw, NOW Clocks/Watches


> --- In CAD_CAM_EDM_DRO@egroups.com, Alan Marconett KM6VV <KM6VV@a...>
> wrote:
> > Ian,
> >
> > I'm not sure I see the distinction between watches and
> clocks........
>
> Alan, As an ex-watchmaker, that struck a nerve, but I wasn't sure why.
> In thinking about it, I believe the distinction has to do with
> position adjusting.
> That is, a clock runs only in a fixed position, a watch doesn't.
> A wrist watch, (old timey mechanical watches) were usually adjusted
> to three positions; railroad watches to either five or six positions.
> Of course, your best regulator pendulam clock won't compete at
> all rotated 90 deg. to the horizontal, it won't even run. That's
> also why the cheap Baby Ben clocks could be regulated to a fairly
> good accuracy (gravity only in one direction). BUT the same 'works'
> in a cheap dollar watch was hit or miss. Now and again one would
> appear to keep perfect time. What happened is that all the variables
> just happened to cancel out. That is, it may have lost 5 min a
> day 'stem dowm' on the customer's wrist, then gained it back 'dial
> up' on the nightstand. Just by chance. Now try to explain why your
> 17 jewel watch will do better, knowing it MIGHT not, but surely will
> in the long haul.
>
> I know I took this out of context, but knowing the intellect of the
> list, thought it might be of interest.
>
> I bet this is NOT the proper distinction between clocks and watches?
> Fire away,
> Al
>
>
>
>
>
>
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