Finally I paint the stand with with outdoor black paint. After MUCH research, I found that the cheapest way for me to get basic (and automatic) sidereal tracking is to build (or buy) a motorized equatorial platform, which required absolutely no … Using the Stellarfane directions, I laid out the two sides, made out of ¾ plywood for added stiffness. Standard Dobsonian Mount Kits: Inexpensive standardized sized solid mounts and altitude bearing kits for 6" f/8, 8" f/6 or 10 f/4.7 telescopes. We chose to use cheaper ‘Far Eastern’ plywood and give it a painted finish. I used the router and arm described previously only the base piece was 18" so the pivot point was 9". Now position the front of the rocker box so that it touches the two sides. When the glue has dried, sand all the surfaces including the altitude wheels and the retainer discs. It is an Newtonian optical tube, mounted on a very simple, yet very stable and easy to use alt azimuth mount. Aperture: 12.5 inches (30 cm) Focal length: 1,500 mm Focal ratio: f/5 Weight: Mount … When dry, I cut the excess laminate off the bearing and filed the edges inward so as not to pull the laminate off. Place one blank on the table, mark its centre, then drill a small pilot hole. To begin the build, enter the nine dimensions required in the yellow boxes of our Calculations spreadsheet. Assemble box with wood glue and #17 1¼" or 1½" wire brads (four per side). Place the two side panels on top of the rocker box base so that the points you just marked match up with the line you drew across the base. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. What is an Dobsonian? For added support, I added three 3/16" wooden dowels (and glued them in) to each joined piece. In this section, we’ll be referring to the resources on the ‘Assembly’ zip folder throughout, so we recommend that you print these out before you begin. CONSTRUCTION. Don't take the lack of comments as a reflection of your work. The dimensions of our design are based on a 10-inch Newtonian reflector but you can work out what size components you need for any Newtonian with an aperture of 8 inches or more using the ‘Calculations’ spreadsheet in the ‘Construction’ zip folder available at the link above. Reply Finally I sanded the rocker box and sealed it with I applied high gloss polyurethane. The size was governed by the placement of the ground board feet. After cutting the board with the router previously described when I made the rocker box bottom, I up drilled the center pivot hole, which must be drilled out to fit the 3/8 inch threaded Tee-nut. If you have a 150 mm F8 mirror, a 200 mm OD tube is needed. Remember I said I got the last of the Ebony Star Laminate for the altitude bearings. There are a lot of options for the ground board (see Stellarfane), however, I chose the easiest construction especially since I had cut the board to size already when I made the rocker box bottom. The mount works via friction, just little enough to easily move the telescope, but yet enough that the telescope remains pointed. Many thousands of astronomers have constructed their own Dobsonians, but the satisfaction of building your own mount is immense. Place the router and jig on the board, then tap the nail into the pilot hole. Drill the holes at the sizes specified on Diagram 1, and then a 12mm hole in the centre of the rocker box base, plus a 10mm hole in the centre of a vinyl LP you can bear to live without! For this task I followed the directions provided by Stellafane. The plywood Dobsonian mount is simple to build and very functional. Came across this while looking for some ground board/azimuth bearing ideas. I located 3 screw holes near the edges of the bearing and the corners of the cradle avoiding the corner triangles. Unlike the Altitude Bearings themselves which had to be perfect circles, the two sides of the rocker box don't need to perfectly circular, they just need to be identical. I used masking tape to draw on and measured ½ inch down from the top corners. Attach the altitude bearing wheels to the tube rings with oversize washers, sandwiching the dovetail bars. The project was started some years ago with no particular target date in mind. Attach the three azimuth bearing pads to the baseboard at 120° positions. Remove the plunge router’s foot and use it as a template to cut the circle-cutting jig: its length should be 450mm, its width the same as your router. A Dobsonian mount is so easy to set up and use, it feels like second nature. Now that the cradle/tube assembly is in balance, I measured from the back end of the tube to the center mark on the cradle/altitude bearings. I cut the pieces in half and applied DAP contact cement to the laminate and bearing edge. Next, I attached the 1" x 1" teflon pads with screws which came with the pads courtesy of Jim from ScopeStuff. FREE Shipping. 4 years ago, Formica Brand Laminate 30-in x 96-in Ouro Romano-Etching Laminate, DIY Composite Layup and Vacuum Bagging - Making a Carbon Fiber RipSurf for Braille Skateboarding. Install knobs for ¼"-20 shafts onto ¼"-20 Pan Head Bolts (2" long) that will be used for lowering the pressure plate. Start the router and plunge it down by just 3mm, then lock it and slowly rotate it around the nail in a complete circle. Where the lines cross is the center of the cradle on the tube. Attach the router by aligning a 2mm nail through the jig into a pilot hole at the centre and rout a circle. I did not attach a second piece to the front leg at first, however, upon checking the stability, I attached a second piece in a 'T' shape using wood glue and deck screws. For this, use the measurements from the design program to determine where exactly to mount the spider and at what distance from the optical tube. Centre the dovetail bar of your telescope on this line both vertically and horizontally, then mark and drill the two holes for attaching the tube rings. 3 years ago. The size can be calculated as follows: (formula from Stellafane) 1.2 to 1.8 times the tube outside diameter, with a bias towards the large size. How To Build a Dobsonian Telescope: DIY Astronomy Project. As recommended by Stellarfane, I used three hockey pucks for the feet as they are weather proof and raise the ground board enough for the pivot bolt to be secured on the bottom. Mark the centre of the side panel sheet (the long rectangle), drill a pilot hole, then move the nail in the router jig to position ‘b’ and cut out another circle. I traced two perpendicular lines through the center of the bottom piece and then set the rocker box onto it. Mark its outside edge on the top of the rocker base. The release mechanism is below the motor. It was also impossible for me to change the programming or maintain the system. Prior assembly: 1) To the top piece drill six5/16" holes approximately 3/4" from the edge centered over the pressure beam as recommended by Stellafane. Attach edging strips to the altitude bearing wheels and then attach the tube rings to the telescope. The last step is to build the mount. Drill pilot holes for the cut-outs then re-position the nail in the jig and rout out the two holes. As a result, the reflector began to collect dust, so I decided to give it new life by making a Dobsonian mount for it. Sky-Watcher Dobsonian Upgrade Kits for GOTO upgrades your Standard Dobsonian to Full GoTo and Tracking Mount. Let's start! I was going to use the album (in fact I purchased Kenny Rogers Christmas Album from Ebay for $2.00) but decided to use an inexpensive laminate (Formica Brand Laminate 30-in x 96-in Ouro Romano-Etching Laminate) from Lowe's because the teflon sliders could be spaced farther apart. There’s nothing really fancy about the particle-board mount and base itself, but it can be replaced DIY-style if it gets roughed up. Frustrated with the high cost of a proprietary Go To, the author developed a free, open source, DIY option, rDUINOScope Boiana.. rDUINScope Boiana is an open source Go To unit. Carefully mark the centre of each square altitude-bearing wheel blank by drawing a line diagonally from opposing corners to form a cross at the centre. Continue until you have cut through the full thickness of the board, then repeat for the second blank. Did you make this project? Take one of the rocker box side panels and mark the centre point on its bottom inside edge; repeat for the other side panel. Many scopes use a fairly complicated device called a spider, with four vanes that attach to the tube in four places and support a special device called a secondary mirror holder. I have an Orion 203mm (8-inch) reflector telescope (f/4.9) that came as a package deal with the Sirius GoTo mount. Our own version of the popular maual mount system for large tubes - ideal for deep sky observation Contact our Sales Team by Email: sales@orionoptics.co.uk or Telephone: 01782 614200 Good luck with yours. Mark the centre of the two side panels you produced in Step 5 with lines from opposing corners again to form a cross at the centre. After completing my homemade telescope mount it was powered by a Meade DS motor kit. The XT8g Dobsonian requires power from a 12-volt DC field battery or AC adapter, sold separately. Our main material for the mount is plywood (see Selecting Plywood for your Dobsonian).We will also use standard hardware, such as screws nuts and bolts, and you should consider using Rustproof Hardware for exposed items (screws, which will painted or sealed with the plywood after assembly is not nearly as critical to be rustproof). Note variable speed. Now lay the bearing on the 45° line, with the center of the bearing on the center mark. Motorizing a dobsonian adds automatic tracking and finding capabilities. The normal dobsonian mount is a gun carriage type system with two arms, but this special mounting method is similar like GoTo mechanics or half-arm mounts. I attached a 1" x 2" to the back legs and then another 3" diameter deck board from the front leg to the middle of the 1" x 2". I'm building a new dob base for my old Coulter Odyssey 13.1. The designs are all freely available and a community of helpful makers has sprung up around it. Tape measure, protractor and pencil – For accurately marking out the positions of the various components. But it's complicated to build and expensive to buy (about $50). The DIY Arduino Telescope GOTO control project Why make your own Arduino control system? Then reduce the height of the screw base and centre tube sections of the adjustable feet to 25mm and attach them to the underside of the baseboard with epoxy resin and No 6 ¾-inch screws. I had to remove wood from the circular triangles in order for a proper fit. Lastly I cut the bottom as described previously. Share it with us! Next, refer to Diagram 2 and drill out the nine 4.5mm holes in the rocker base as shown; countersink the holes on the reverse. Place the vinyl LP centrally on top of the azimuth-bearing pads then place the rocker box centrally over the baseboard. We will now construct the rocker box portion of this bearing. The Pressure Beams and Triangles: ¾ inch N-N birch plywood. The optical tube is done. Finally, lower your scope gently onto the rocker box’s ‘cups’. The azimuth bearing is formed between the rocker box bottom and the ground board teflon pads, rotating on a pivot bolt the connects these two parts. Lastly, I applied high gloss polyurethane to the bearings. Once the glue is dry, draw a pencil line perpendicular to the existing line (which you drew in Part 1) through the centre of each altitude wheel. For added support, I added two 3/16" wooden dowels (and glued them in) to each joined piece. Gently lower the altitude wheels into the bearing ‘cups’ to complete the assembly. The Orion SkyQuest XT8g GoTo Dobsonian also includes an EZ Finder II reflex sight, eyepiece rack for one 2" and three 1.25" eyepieces, hand controller bracket, quick collimation cap, and a digital download insert for Starry Night SE astronomy software. Making a GEM telescope mount suitable for GOTO and astrophotography and near-unattended operation is extremely daunting. Four holes near the ends are 1½ inches in; the two center holes in the top are centered. However, I purchased an Orion ED80 80mm (f/7.5) refractor telescope to use with the GoTo mount for astrophotography. 99. Tape measure and pencil – Accurate measurements are essential for making sure that the mount assembles to a tight tolerance. Tape measure and pencil – Accurate measurements are essential for making sure that the mount assembles to a tight tolerance.. Telescope – This project assumes that you own or are going to acquire a … How To Build a Dobsonian Telescope: DIY Astronomy Project Star Party: 100 Hours of Astronomy At a Telescope Near You The 5 Most Powerful Telescopes , and 5 That Will Define the Future of Astronomy For my box it was 12¼". Dobsonian Mount. I used wood glue, 1 5/8" deck screws, and 3/16" wooden dowels. Lightly coat the outside of one of the T nuts with epoxy resin and pull it into the top of the base board using a 10mm bolt and washers until it is firmly seated.
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