You can get a lot of parts for a tracker from this guy google bencooper karoo barn door tracker.
Using a barn door tracker.
This will counter the effects of the earth s rotation as you move the tracker.
I have built a few trackers over the last few years using a slightly different design and a curved rod for greater tracking accuracy.
How to use your barn door tracker polar alignment.
Using a piece of plywood large enough to layout a 11 43 radius using a compass scribe the radius onto the plywood.
I like this article the camera mount in particular is very ingenious.
Using your new homemade barn door tracker.
The next task is to bend the threaded rod to match the 11 43 radius so that the mount will track correctly as the barn door mount is rotated about it s hinge.
Solidworks cad model of the barn door tracker.
A barn door tracker also known as a haig or scotch mount is a device used to cancel out the diurnal motion of the earth for the observation or photography of astronomical objects it is a simple alternative to attaching a camera to a motorized equatorial mount.
Polar alignment is the process of aligning the hinge of the tracker with the north or south celstial pole depending on your location.
Just because of the limitations of the design and lengths of the bolts we can use a barn door tracker is only really capable of being used for approximately 8 10 minutes.