Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. widening the hole. Depending on your telescope, one of the Brackets that Robert has may work for you. In order for the Rocker Box to pivot on the Ground Board, a center pin is placed in a hole at the exact center of the Ground Board and Rocker Bottom. Some of these are essential for the basic functionalities of our websites. Funny how the bigger they are the better for dobs. My homemade motorized telescope focuser for Celestron C8. Once Id built a CNC router, I embarked on my third telescope, featuring a 16 primary mirror with aluminum trusses, wide vertical bearing arcs, a steel front-adjustable mirror cell, and a rotating base. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. 4 years ago I decided to use baltic birch because it is recommended by Kriege and Berry as well as many online sources. Orient this assembly to allow you to view an object on the far horizon. Have you made any mods on it since you built it? Just as it was about to come into focus, the focuser bottomed out. by cranking the nylon screws going up from the bottom, but I found the knitting I am using scrap upvc pipe material. 4 years ago In my case I decided to make a custom bracket. But let me see what items I can arrange to make a helical. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. Several of my Recent Images have been focused with this system. Motion is very smooth. Thanks again for the 'ible. can't click on it or copy and paste it; it's a graphic file to thwart I think I got what I wanted and seems best solution for me. On the cutting diagram, you can see that the side bearings were cut 26 inches long. Nice one. I hate focusing. After picking up a copy of The Dobsonian Telescope by David Kriege, I built my first telescope with a 12-diameter mirror, then later tackled a 12 lightweight scope. Remember: It is the quality and SIZE of the capture chip, NOT the megapixels that determines quality. I phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. You can view and download the full file here. 1" Rack & Pinion Focuser. I welded mine from steel square tubing. It was easy enough to drill a hole and tap threads for a Today I purchased what is called atank nipple in India. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. I'm only hoping to supplement it a bit with some info and pictures aimed at those with limited skills (such as myself) :-) I'm not an electrical engineer, I'm more of a software guy with some limited knowledge of electronics and basic soldering and assembly skills. On the bottom of the Bottom board is a ring of Ebony Star laminate that glides over the three teflon pads located directly above the feet on the ground board. So I was looking for a cheap, light-but-sturdy design for a Not sure how your toilets are built over there, but here they use what is called a tank flush valve. I had some carboy caps that make good knobs. The arc at the top of the sides needed to have a radius 1/8 inch larger than that of the side bearings to account for the thickness of the teflon pads that would fit between.
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homemade telescope focuser