The tangent so far. This part is so simple on paper but so fiddly to build.
Not the prettiest part, steampunkig happening later
The cylinder block is a 40x40mm Aluminium block with a 20mm cylinder and in that a 12mm cylinder threaded for 5/16th brass rod. Both cylinders move... up and down for the 12mm and back and forth for the 20mm which allows the rod to stay straight
A pair of brass bevel gears will have a brass rod for slomo hand control to the back of the scope. Only taken about 10 hrs in the shed to get this right
I must be nuts. Lottas fun though
Quite a bit of range in Dec with this...maybe 20º either side of centre.
The RA electrics, hand control and stepper motor driver, from AWRtech in the UK has been built and is in the post.