[simpits-tech] Zero point on a two needle altimeter

[Rod Dale]

The minute hand would be okay but the hour hand has 12 positions. An
altimeter has 10.
Rod

----- Original Message -----
From: Gene Buckle <geneb@deltasoft.com>
To: <simpits-tech@simpits.org>
Sent: Saturday, October 26, 2002 3:03 PM
Subject: Re: [simpits-tech] Zero point on a two needle altimeter


> You guys are missing the obvious.  Buy a cheap battery powered clock drive
> and drop the original motor out of it and drive it with a stepper motor.
>
> g.
>
>
> On Sat, 26 Oct 2002, Matt Bailey wrote:
>
> > Interesting ideas on this subject! One thing to keep in mind, the
> > relationship of the turning of the hands of an altimeter is always the
> > same, the hundreds needle always makes 10 revolutions per one revolution
> > of the thousands needle etc. So you really only need one connection to
> > the motor and sensor (perhaps on the hundreds needle, for precision) and
> > just drive the other needles off that, using gears or pulleys. Also, if
> > you had a way to measure the position of the ten thousands needle, your
> > software would always know where that needle was and hence where the
> > other needles are...only problem might be resolution since there is so
> > much difference between this needle and the hundreds needle, for
> > instance. But without having to count the number of revolutions for this
> > needle, you would get a range of 100,000 feet. Quite sufficient for
> > anything other than very high performance fighters (like the F-104) or
> > spacecraft.
> >
> > -Matt Bailey
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