For this jig, I used the aluminum shower curtain poles and mounted them on temporary, articulated wooden tube holders. The truss tubes are 1 inch diameter, 0.050 inch thick, black anodized aluminum tubes purchased from Moonlite telescope components. The fittings are made with large holes to save as much material and to reduce the weight as far as possible. I “grab”, one by one, each of these hooks with the lower bicycle rim and pull or push the truss pairs until they are in the right position. So I have now 8 sets of dual ball-swivel ends for trusses that will make my 12" into a horseshoe truss tube newt. A large plastic locking ring that came with the shower head assembly covers the edge of the ball and screws into the socket. 1.25" OD - 049 wall $5.25 per foot. I plan on making some kind of pouch to hold and protect the three pairs of poles when in transit. An alternative would be to purchase 1 inch aluminum or stainless steel ball joints available from McMaster Carr. Email for info. Due to the strongly slanted reinforcement ring, the angle on some of the truss tubes is more than 45 degrees to the ring’s surface. Moonlite 1-speed and 2-speed, 2" crayford focuser. Here is a sketch showing the bottom bicycle rim above one of these forks, just before it is lowered on the truss attachement bracket: When the three pairs of trusses are at the right position, I lower the empty UTA onto the three bolt heads in the bottom of the “fork tops”, like this: Finally, I screw the plastic knobs and their 5/16 inch stainless steel bolts in until they tightly attach to threaded holes in the bottom UTA bicycle rim. The light shroud, a $100.00 option with most truss telescopes sold, is a TeleKit standard feature. Truss tubes are used very often for constructing a large telescope. Truss Tubes: TeleKits are supplied with 6061-T6 seamless aluminum trusses. At the same weight, a truss tube is much more rigid as full-tube, or vise versa: Can be built much lighter at the same stiffness.In addition to that, the truss structure provides only a very small surface against the wind. They are protected with a black, heat shrink protective coating. All this takes less than 2 minutes and requires no tools. The Serrurier truss is composed of eight individual trusses, four holding the primary mirror and four holding the secondary mirror. The truss tubes are 1 inch diameter, 0.050 inch thick, black anodized aluminum tubes purchased from Moonlite telescope components. The large knobs, both at the top and bottom of the truss tubes, means no tools are required to assemble the OTA. In stock. The truss tubes are 1 inch diameter, 0.050 inch thick, black anodized aluminum tubes purchased from Moonlite telescope components. We offer aluminum tube in the most popular sizes. The following sketch and picture shows the various components of this UTA attachement bracket: The center of the ½ inch aluminum bolts are drilled and tapped to take a 5/16 inch stainless steel bolt. I eventually plan on numbering them, but with practice, I’ve come to be able to tell them apart. At the same weight, a truss tube is much more rigid as full-tube, or vise versa: Can be built much lighter at the same stiffness.In addition to that, the truss structure provides only a very small … This results in the known structures of six or eight rods. Specify size, length, and amount. All metal construction.-- Email me your requirements at densteele@dobstuff.com--$279 : Spider Four curved vane: You must have JavaScript enabled in your browser to utilize the functionality of this website. Astronomik MC glass for Full-Spectrum Modification of EOS DSLR's, Material for bearings: PTFE/Teflon and EbonyStar, Changed VAT rate in germany - new prices for customers in europe, Lucky Imaging with the Astronomik ProPlanet 642BP, Aurora Flatfield Panel with 75cm diameter. By large I mean that it generally has a primary mirror of over 10 inches in diameter. After reading Albert Highe’s book and using his equations for calculating deformation caused by both bending and tube offset, I realized that 1 inch diameter tubes would work just as well and would help improve OTA weight balance. With this setup, collimation is rarely far off, even after a long trip with the telescope disassembled in the car. They are protected with a black, heat shrink protective coating. I adjusted the distance between the center of the primary and secondary mirrors, taking the 78 inch focal length into consideration and substracting 14 inch for the side focal plane position. 1.50" OD - 049 wall $5.75 per foot Determining the final pole lengths was a frustrating exercise. Available in lengths up to 12 feet. Tube Inserts:--1" to 2", $5 each* Knobs 1/4-20 threaded stud, 1.5" long, 1 1/8" diameter:--$5 each. The best prices I have seen have been "dobstuff" in the US or GSO from telescope service.de , including optics components. The Carbon Fiber Truss Tube Design : Three CNC-machined aluminum support rings form the basic structure of the optical tube. The balls are secured in a socket that is attached to the hemisphere’s reinforcement ring. Damping time of the OTA alone is less than 1 second when looking at Polaris at 420x magnification and I don’t think it’s coming from the OTA but rather from the tracking platform . 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