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

[Rod Dale]

Sorry, I meant that I used a stepper motor on the altimeter - not a servo.
You have to modify the servo to enable  > 360 degree rotation. I haven't
been game to try that yet.
I intend to use Phidgets for all my engine instruments - next job on the
bench.
Rod
----- Original Message -----
From: Gene Buckle <geneb@deltasoft.com>
To: <simpits-tech@simpits.org>
Sent: Sunday, October 27, 2002 11:06 AM
Subject: Re: [simpits-tech] Zero point on a two needle altimeter


> > I tried that. I connected the servo to the arm that connects to the
bellows
> > but because the gearing is very fine, a quarter turn of the servo put me
> > from 0 feet to 5000 ft !!!! The bellows don't move much at all. I ended
up
> > ripping the inners out of the altimeter and connected the servo to the
> > centre shaft.
>
> Rod, you might try it again under Phidget control.  With a phidget, you
> can get tenth degree precision if the servo is high quality.
>
> g.
>
>
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