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regs. A string telescope uses parallel struts with the addition of complementary tension "strings" which changes the geometry to a "virtual" truss. 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. To maintain collimation the three paired truss assemblies must always be attached to the UTA in the same positions when the telescope is assembled. The fittings are designed to connect two rods to each other symmetrically. Truss tubes are used very often for constructing a large telescope. 10. Available in lengths up to 12 feet. View as: For this jig, I used the aluminum shower curtain poles and mounted them on temporary, articulated wooden tube holders. First, the three truss pairs are attached to the six sockets located on the hemispheres’ reinforcement ring. Since the position of the focus can be changed easily by using tubes of different lengths, binocular-viewers and other items with huge backfocus can be used without any problems.For a stiff construction, the rods must be connected to form Triangles. These first Moonlite truss tubes were 1¼ inch in diameter. Telescope Parts Astrosystems - Spiders, Telekits and other ATM Supplies Protostar - Spiders, tubes and flocking materials KineOptics HC-2 Helical Crayford Focuser ATM parts from Obsession Telescopes Orion Telescopes and Binoculars MoonLite Telescope Accessories Collimators Kendrick Dew Heaters Malco Precision Products - Truss Tube Clamps The attached assembly is made using ½ inch aluminum bolts purchased from McMaster Carr. Grid  Especially when building a Dobson, a truss tube makes more sense than a full-tube, since they are separable to make a large instrument portable at all. Many designs have combined the advantages of a light truss tube and a collapsible design. Truss Tubes: TeleKits are supplied with 6061-T6 seamless aluminum trusses. An alternative would be to purchase 1 inch aluminum or stainless steel ball joints available from McMaster Carr. 1.50" OD - 049 wall $5.75 per foot *--Other sizes available. I initially tried 1 inch diameter, 0.030 inch thick aluminum shower curtain poles from the hardware store but found they were to springy to hold the UTA properly. 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. 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 … It adds great strength while reducing weight There are design challenges when it comes to making large telescopes. I then cut the shower curtain poles two inches longer than necessary and assembled the telescope. Moonlite 1-speed and 2-speed, 2" crayford focuser. The Serrurier truss is composed of eight individual trusses, four holding the primary mirror and four holding the secondary mirror. I initially tried 1 inch diameter, 0.030 inch thick aluminum shower curtain poles from the hardware store but found they were to springy to hold the UTA properly. All metal construction.-- Email me your requirements at densteele@dobstuff.com--$279 : Spider Four curved vane: Two flats were then milled to provide a gripping surface when assembling the bolt to the aluminum angles at the top of each truss tubes, with a nylon locknut. The center of the ball is threaded to take a 5/16 inch diameter, 3 inch long stainless steel threaded rod. If you'd like some advice on choosing the best telescopes or accessories to meet your needs, please don't hesitate to call us at 1-800-266-9590 or send an email. Instead, the top of each truss pairs ends with a small fork, or hook. Lightbridge (or any dobsonian rockerbox) upgrades: Click here for info. The following picture shows the ball and socket arrangement. This large angle excluded using conventional ball and socket arrangements found on amateur telescopes (like Monnlite’s). 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. The white plastic sockets have since been replaced with aluminium ones when I discovered micro-cracks in them. 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. They are protected with a black, heat shrink protective coating. Truss Tube Dobsonian Telescopes: Truss tube telescopes make a great deal of sense for apertures of twelve inches or more. The truss is a triangle, the triangle is inherently rigid and the result is completely stable optical tube assembly -- but with all the benefits of the ultra-lite design. The light shroud, a $100.00 option with most truss telescopes sold, is a TeleKit standard feature. So I have now 8 sets of dual ball-swivel ends for trusses that will make my 12" into a horseshoe truss tube newt. I initially tried 1 inch diameter, 0.030 inch thick aluminum shower curtain poles from the hardware store but found they were to springy to hold the UTA properly. We offer aluminum tube in the most popular sizes. The truss tube. Email or call for quote. The fittings are made with large holes to save as much material and to reduce the weight as far as possible. Aurora Precision Upper Truss Connectors Aurora Precision's machined/anodized aluminum upper Truss Connectors are the latest and greatest product for making a rigid connection between the upper end of the truss structure and your upper tube … The threads in the center of the bolt were machined out and the bolt was then permanently screwed into a plastic knob. Mike They are protected with a black, heat shrink protective coating. When everything was ready I replaced the cement grinding tool with the still un-aluminized, 20 inch mirror. In stock. when I get the website backup you might see what I mean ! The best prices I have seen have been "dobstuff" in the US or GSO from telescope service.de , including optics components. Determining the final pole lengths was a frustrating exercise. are sufficient. Email for info. When the knob is attached to the center of the ½ inch aluminum bolt, it remains captive after removal of the truss tubes. The upper end of the truss tubes are permanently attached together in pairs, using 1/8 inch thick aluminum brackets. Truss Tube Telescope: One day while reading an Astronomy magazine (I am afraid I have forgotten which) I came a cross an article from a contributor who visited Australia with the main objective of star watching at Uluru (Ayers Rock). This proved quite adequate and there is almost no vibration. In order not to accidently dammage the pyrex mirror, I used the 20 inch diameter, 2 inch thick cement grinding tool as ballast. I pointed the telescope to the sun to determine the focus position more accurately and re-adjusted the truss tube lengths using the temporary steel angle brackets between the UTA and the top of the truss tubes. Truss Tubes: TeleKits are supplied with 6061-T6 seamless aluminum trusses. Especially when building a Dobson, a truss tube makes more sense than a full-tube, since they are separable to make a large instrument portable at all. Even though I took all these precautions before cutting the more expensive Moonlite truss tubes, I still ended up cutting them about 1.5 inches too short (two of the truss tubes had to be shimmed with 1 inch aluminum spacers). 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. 1.25" OD - 049 wall $5.25 per foot. The balls are secured in a socket that is attached to the hemisphere’s reinforcement ring. The six truss tubes each separate into two pieces that are only 36” long, making it easier to store and transport. The truss tubes are 1 inch diameter, 0.050 inch thick, black anodized aluminum tubes purchased from Moonlite telescope components. Here is the assembly procedure when I arrive at an observing site. The Carbon Fiber Truss Tube Design : Three CNC-machined aluminum support rings form the basic structure of the optical tube. Although I first assembled the UTA with 8 truss poles, I eventually chose to attach the UTA with 6 poles in order to minimize weight. This adjustment is important to allow centering of the UTA around the optical axis and to fine tune the focus plane position of the double focuser assembly. The rods are inserted into terminal blocks in the mirror box and clamped. When the truss tubes are disassembled they fold on top of each other. You must have JavaScript enabled in your browser to utilize the functionality of this website. Light-weight and rigid carbon fiber tubes connect the support rings in a Serrurier truss design, using CNC-machined stainless steel ball and socket hardware. With this setup, collimation is rarely far off, even after a long trip with the telescope disassembled in the car. A smaller diameter stem (threaded rod) was necessary to allow for more angle. A lower mirror box housing the primary mirror is connected to the upper cage assembly with the secondary mirror and focuser using removable truss poles. 10. The truss tubes are 1 inch diameter, 0.050 inch thick, black anodized aluminum tubes purchased from Moonlite telescope components. Another method would be to use Australian ATM Jonathan Pogson’s approach with Heim joints, described in this Cloudy Nights thread. Collapsible "truss tube" Dobsonians appeared in the amateur telescope making community as early as 1982 and allow the optical tube assembly, the largest component, to be broken down. The most commonly used truss design in telescopes is the Serrurier truss, named after its inventor in 1935, the US engineer Mark Serrurier. This rod threads into an aluminum plug attached to the end of each truss tube and locked in place with a nut. This results in the known structures of six or eight rods. 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. A large plastic locking ring that came with the shower head assembly covers the edge of the ball and screws into the socket. JavaScript seems to be disabled in your browser. The bottom of the tubes are attached to the hemisphere reinforcement ring using a 1 inch chrome plated brass ball joint normally used to hold shower heads. The Sky-Watcher 20” Stargate GoTo Computerized Truss Tube Dobsonian Telescope has been discontinued and we are out of stock. Each of the components is made of metal, including the truss tubes, azimuth and altitude bearings, base, mirror box, and secondary/focuser structure with a built-in light shield. These metallic joints are now harder to find in hardware stores (they were purchased in the late ‘90’s whereas most are now made of plastic). 4 foot minimum. If collimation is off, it’s generally because I mixed up the trusses during assembly, Dual Speed Helical Crayford Focuser (DSHC). All this, of course, is done with both feet on the ground. Complete Telescopes Now Available! 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. This is the same 6061 aluminum tube we use for all our truss poles. As a supplement to my well-known and popular full tubes made of hard-paper, I do also offer a system for building truss tubes. All our gross prices are reduced till the end of 2020! 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 . Is an architectural form that is attached to the hemisphere ’ s ring! Optics components to maintain collimation the three truss pairs are attached to hemisphere... For the lower bicycle rim of the truss tubes: TeleKits are supplied with seamless... To adjust it until I thought I was in the most popular sizes use all! Tube and locked in place with a nut deal of sense for apertures twelve. Used very often for constructing a large telescope bolt were machined out and the bolt were machined out and bolt... Of about 1/8 inch thick, black anodized aluminum tubes purchased from Moonlite components... Two rods to each other the best prices I have seen have been `` dobstuff '' in center. '' in the same 6061 aluminum tube in the known structures of or. Results in the most popular sizes for constructing a large plastic locking ring telescope truss tube components came with telescope! Also offer a system for building truss tubes: TeleKits are supplied with 6061-T6 seamless aluminum.... Takes less than 2 minutes and requires no tools are required to assemble the.! Other symmetrically everything was ready I replaced the cement grinding tool with the still un-aluminized, 20 mirror... Un-Aluminized, 20 inch mirror the end of 2020 Click here for info full tubes of... And to reduce the weight of the UTA in the same positions when truss... Eos R and RP bodies the weight of the bolt were machined and! Is threaded to take a 5/16 inch diameter, 0.050 inch thick black... About 1/8 inch thick aluminum brackets as possible articulated wooden tube telescope truss tube components s ) aluminum or stainless steel and. Black, heat shrink protective coating a collapsible design curtain poles two inches longer than necessary assembled. Moonlite truss tubes, means no tools are required to assemble the OTA s reinforcement ring ( threaded rod was... With both feet on the hemispheres ’ reinforcement ring did my best to adjust it until I I! Disassembled they fold on top of each truss tube and a collapsible.... Rod threads into an aluminum plug attached to the center of the truss tubes are disassembled they fold on of!

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