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Old 22-11-2007, 09:16 PM
AndrewJ
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AndrewJ is offline
 
Join Date: Mar 2006
Location: Melbourne
Posts: 1,905
Gday Fahim

I've actually been looking at this for a year or so, but i'm slow
at turning it to reality.
I built a manual wedge and am now in the process of motorising it.
Expensive, high torque motors arent required if you do it right.
( In my finished alt system, the motor was $13 and the gears $5 )

However my wedge is not a normal design.
It folds down to allow the scope to be loaded and once in position, it is essentially held together by gravity.
As such motorisation is relatively simple
I have attached piccies of the wedge design, and the finished Alt adjustment motor below. One rev of the motor output shaft gives approx 15arcsec of wedge adjust, so its easily controllable.
I plan to write a simple app to capture a webcam stream, calc drift and adjust accordingly
ie do an automated drift align.
Shld be fun if it works.

Andrew
Attached Thumbnails
Click for full-size image (Scope in Load Position.jpg)
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Click for full-size image (Scope in Position.jpg)
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Click for full-size image (AltMotorII.jpg)
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