spudrick
14-01-2007, 10:21 AM
For a while i have been thinking to replace the pretty ordinary chipboard base on my 12" GSO. After reading up on the "Push-To" system using large diameter setting circle on the base and a inclinometer on the tube i decided to try it and make the new base at the same time.
I adjusted the size of the setting circle to be 61cm diameter and got it printed and laminated.
I used a sheet of 18mm plywood and used the mount as a template, i also modified the base from the triangle ground board to 2 circles like the Skywatcher which suits the setting circle placement better.
Having not had experience with a router to cut out large (63cm) circles before it was probably the hardest part of the job. I made an adjustable guide for the router and to my surprise it worked really well.
I added a full circle of laminex to the base and fitted new thicker Teflon bearings. I aslo added side braces for strength. I changed the handle to a aluminium one and painted the side hardware silver. For the setting circle i cut a semi-circle out of the top board to see the scale. I made screw adjustable feet and inserted a bubble level into the base.
For the Inclinometer i made a timber dovetail and fitted it to the finderscope base.
As my scope was the standard model i also updated it by fitting a fan and added Bob`s Knobs.
By doing this i have found it is easy to make a lot of mistakes timber is not very forgiving but i am happy with the finished job now i just need to test the working of the "Push-To" :)
I adjusted the size of the setting circle to be 61cm diameter and got it printed and laminated.
I used a sheet of 18mm plywood and used the mount as a template, i also modified the base from the triangle ground board to 2 circles like the Skywatcher which suits the setting circle placement better.
Having not had experience with a router to cut out large (63cm) circles before it was probably the hardest part of the job. I made an adjustable guide for the router and to my surprise it worked really well.
I added a full circle of laminex to the base and fitted new thicker Teflon bearings. I aslo added side braces for strength. I changed the handle to a aluminium one and painted the side hardware silver. For the setting circle i cut a semi-circle out of the top board to see the scale. I made screw adjustable feet and inserted a bubble level into the base.
For the Inclinometer i made a timber dovetail and fitted it to the finderscope base.
As my scope was the standard model i also updated it by fitting a fan and added Bob`s Knobs.
By doing this i have found it is easy to make a lot of mistakes timber is not very forgiving but i am happy with the finished job now i just need to test the working of the "Push-To" :)