Stainlesssteve
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Posts posted by Stainlesssteve
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So far I have had better results from the barn door than from my motorized EQ3-2 but still have a small wobble of about 10 arcsec from the joint between the motor and the studding.
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Did you get any juddering where the studding moves sideways across the cam?
Hi!
I did a little survey of the barndoors designs, and proposed a simpler design than the types 2/3/4 with good accuracy. It is here :
http://www.astrosurf.com/fred76/planche-tan-corrigee-en.html
Fred -
Mine is a bit different to the normal Barndoor but the geometry is type 3.
https://picasaweb.google.com/lh/photo/eiHZFGkMQD4vNC7vRop7c9MTjNZETYmyPJy0liipFm0?feat=directlink
570mm hinge to slider
90mm hinge to CL of tube
620mm hinge to drive point -
Yes the 3d drawing does show a type 3,I used this type as errors in construction have less effect on tracking accuracy than a type 4.
Difference between type 3 and 4 Barn Door
in DIY Astronomer
Posted
Nice find there John, I was going to do something similar to my LX90, but went for the tracker for portability.