Rack & Pinion: For many years the standard focuser was of the rack-and-pinion type - a small pinion gear moved the flat toothed rack that was attached to or built into the moving focusing tube that holds the eyepiece.However, this geared system was far from ideal, with some wobble due to the friction fit between the fixed and moving tubes and backlash due to the gears. Step 3The Side Bearings and Rocker Sides. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. I had installed the mirror about an inch too far away from the focuser. The telescopes size is classified by the size of its mirror. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! The cell from Anttler's, for which I had received a refund, had arrived. needle to be just a little too flexible for the weight of a diagonal and i am not trying to win this contest with photos. how much travel you actually need, you can cut the tube off so none of . Perfect for visual observations with very heavy mirrors. The day I received the refund, I ordered a mirror cell from University Optics. It's easy to shim it to Our websites use cookies to improve your browsing experience. After a dry fit of the rocker to make sure that the tube box with side bearings would fit well, I glued the rocker sides to the rocker front, holding them in place with small nails and clamping overnight. The hole is made slightly larger than the shaft, this is normal. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. We were careful to press out any bubbles as we went, but when the job was done we found that there were multiple bubbles in the veneer. Reply I used a hole saw to cut a wooden plug to fit inside the accessible by all ages and skill ranges. on Introduction. It take automatic control of the CCD camera and focuser, and dances around magically on the screen, arriving at perfect focus within about 30s to 3 minutes depending on where you started from. Having an RS trade counter 2 miles away is such a luxury! Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. But let me see what items I can arrange to make a helical. I'm' glad I did, because I didn't like the first color that I had chosen. Just to make sure I liked the stain, I applied some to a piece of scrap wood. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. With Simple | Space The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. I don't *do* pretty. Unbelievable! my 12.5" trackball, but I didn't The kit just contains the electronics - it is up to the user to find a stepper motor and attach it to their own telescope focuser. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. You won't need to write any sketches from scratch, but you will at least need to figure out how to upload them to the Nano. That helps with low-profile I wanted the long focal length for good contrast.

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