We all know how important it is to get the scope properly balanced with a DDM mount.
Radial balance is difficult to achieve, so while my mount is back with ASA I have made a rig to assist in balancing.
The whole system, scope, camera, focuser, telescope plate etc, is suspended on a thin steel cable.
Obviously great care is taken to make sure the cable will not come loose or snap!
There is a white card placed behind the cable with a straight line drawn on it.
I took care to ensure that the line was perpendicular to the telescope plate.
This is the setup:
The first trial showed promise. The cable did not snap!
(The scope was only lifted a centimetre.)
The cable is not quite parallel to the marked line, suggesting that the there is a small counterweight needed near the camera.
The success of this experiment relies on the cable being accurately positioned over the centre of the telescope plate.
An error of a millimetre will produce an inaccurate result.
I will spend the next few days thinking up a way to accurately assess the cable position.
What do people think? Is this a sensible way to measure balance?
I am also considering taking the focuser/camera assembly off the scope tube and making a separate balance check with it alone.