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Re: [ATM] Clock drives and Tracking systems
I think that a third sensor will be needed, at right angles to the others, as otherwise a rotation of the OTA, without changing the direction, will be seen as a movement.
Chris
----- Original Message -----
From: "George Anderson" <georgea@cam.org>
To: <artbianconi@blast.net>; "atm" <atm@atmlist.net>
Sent: Monday, August 30, 2004 3:24 AM
Subject: Re: [ATM] Clock drives and Tracking systems
> Find an old mechanical rat, pick it up and turn it over. Rotate the ball
> cover and have a look at the inside. Picture the two main shafts
> extended to allow a drive motor on each one.
> The main drawback is that you have no way of sensing slippage.
> Now toss out the electronic sensors of the rat and use the drive you
> just visualized. Place an optical rat directly underneath the ball and
> use it to monitor ball rotation. Not the most accurate and you will need
> to do some math for the outputs of the optical rat to be useful but it
> should give you a starting point.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
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