The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). We tried this in our back yard, but found that it was too difficult to aim both the tube and the moving mirror at distant trees in our suburban yard. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. Gift the gift of Make: Magazine this holiday season! And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. 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. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. on Step 5. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. To view, go here: http://emediadesigns.com/focuser/ It takes the unknown out of focusing, and is easy to re-focus between filters, or refocus several times during a long exposure run as the world cools down. telescope page, I wasn't really eager to buy two commercial Crayford Link to the motor speed controller kit:http://www.jaycar.com.au/productView.asp?ID=KC5225(a 5K external potentiometer will be required): http://www.jaycar.com.au/productView.asp?ID=RP3508The drive motor:http://www.jaycar.com.au/productView.asp?ID=YG2734The gears:http://www.jaycar.com.au/productView.asp?ID=YG2736The motor forward/reverse switch:http://www.jaycar.com.au/productView.asp?ID=ST0506The push button:http://www.jaycar.com.au/productView.asp?ID=SP0711 the side of a rigid secondary cage. Slewing to find an object and then tracking an object on the sky, so when you make a homemade telescope on the motorisation process you will need high speed for slewing and low speed for tracking or fine movements. To cut the circles, I started with a depth of about 1/8 inch, then lowered the bit and cut a little more with each pass until I was through the board. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. CNC files (optional) Download the Sketchup files. You really need a step ladder even for my 10" when pointed overhead. After waiting for the stain to dry for a day, I applied polyurethane in two coats, going over the surface with 0000 steel wool between coats. installations. I got no response to phone calls or emails after another week, and decided to wait until the primary would be finished in another two weeks. A I bought a 4" PVC Sewer pipe cap, used a hole saw to cut a 2.25" hole then attached the helical thing to the PVC cap. pageTracker._trackPageview(); The part is very strong! This arrangement turns 100% true, no wobble. The Artemis module works extremely well, and is to be strongly recommended. Participated in the Celestron Space Challenge. From everything I had read, I expected that getting a sonotube would be as easy as running to any hardware store and picking it up. Step 4Attaching the Side Bearings and assembling the Rocker. I have several of the books on building a Dobsonian Telescope. That's pretty much the focuser. I'm also going to focus on only one version of Robert's focuser (there are many). I'm' glad I did, because I didn't like the first color that I had chosen. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. Earthbound1 likes this #2 dave brock Mercury-Atlas Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, PCB (printed circuit board) - download the, DRV8825 - stepper motor driver chip/board - again, clones available on. This combination has proved to be effective for all positions except when the tube is pointed directly up. the interior diameter is just a nudge over 2". There are sub-folders for the different versions. Here is what I was working on but looks like I need a better design. I got no response to phone calls or emails after another week, and decided to wait until the primary would be finished in another two weeks. This allowed me to cut perfect identical circles. 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. Here's a detailed response from a thread at CloudyNights:http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255 "The image scale is wrong on the M31 image, fits too much of the galaxy in for even a 35mm chip. DIY Truss Dob input: How to design truss? Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). If you found some good surplus lenses, you will have made a stunningly good objective for your scope. If you don't want to go that route, contact me at gary.hethcoat@gmail.com since I have a lot of spare parts and I can sell you a "kit" with a PCB and only the parts you need. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. I attached three feet equally spaced on top of the ring, and on the opposite side attached teflon pads 1 X 1 directly above the feet using very small brads and countersinking the brads below the surface of the teflon. I told them to take their time and get it right. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. I did not wrap the tube until I had completed the base. on Step 5, 9 years ago (Sorry you Read the documentation though, there are a lot of functions and options. His project is very well documented. you don't need to paint it (or worry about paint flaking off it). you could probably space the bearings 3/4" apart instead of 1" and mount I redrilled the holes for the mirror cell and got ready to wrap it. Unbelievable! I read the entire thread and surely its going to help me building my focuser. The box should be deep enough to allow the mirror box to swing all the way down. too far. I really had to, since the underside of my telescope's focuser is all curves, no flat area for attaching the mounting bracket. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. I tried all of my other eyepieces and found that I could bring the image into focus in the other eyepieces, but it was very near the bottom of the focuser travel. The day I received the refund, I ordered a mirror cell from University Optics. flexing. (The 8 inches from the center of the secondary to the field stop in the focuser is the same 8 inches from the center of the focuser to the top of the tube.) This is the first telescope that I have built. I did not own all of the tools that I needed for this project, particularly a table saw and router, so I did a lot of work while visiting my Dad. It's the same in form, but has a perfect, true 13.35mm hole. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. (Technically, it should have been 62.5 for a 12.5 inch f/5, but when the mirror came it had a note on the back that the focal length was 61 inches.) This cost around $100 to build and all of the components came from Jaycar, except the brackets which were made with 1.2mm sheet metal. I paid the 50% deposit and dreamed of DSOs. adapter set screws to slide into. haven't yet found any design elements that need improvement. Since these focusers were going side-by-side on a binocular 4 years ago Robert Brown did an excellent video on how to work out your stepper motor requirements. Able to make myself using my own humble tools (or toys as the pros will call them!) Most people will want a knob on document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); tube and nut that fits the outside threads. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. The bearings only need to be Not sure how your toilets are built over there, but here they use what is called a tank flush valve. Able to make myself using my own humble tools (or toys as the pros will call them!). surfaces to put the bearings in and a vee at the bottom that would hold Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts. Two inch internal diameter drawtube. Fairly easy to build and could be adapted to suit any SCT focuser. stronger, but would give me a coarser focus action because of their Electronics and software automate the process of taking pictures. They said they would make the brackets extra long to accommodate the mirror and it would take about a week. See above, this motor does not produce a lot of torque, but you don't need much for this application since there is no 'load' on the focusing shaft. The telescopes size is classified by the size of its mirror. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. What materials did you use? Find a special something for the makers in your life. Two of the holes for the bolts were blocked by knobs. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct. that is a great website that guy has some fantastic photos. Using a compass I drew circles on the top and bottom of the ground board to mark the inside and outside of the teflon ring on the bottom of the rocker bottom. I used a hole saw to cut a wooden plug to fit inside the I had already made a lightweight focuser for The belt and pulleys are off-the-shelf items available on Amazon. Best Wishes, Reply The scope including the optics, truss tubes, and eye pieces all stored in a single box making it easy to store and transport by car, but it was a little too big to fit in the overhead compartment or under the seat on most aircraft. Download and check them out, I just grabbed the first one and printed it. 11 years ago wobbly knob still works, and adds character. After another 3 weeks, I was concerned that I had not received the mirror. a try. This proved fatal for the stepper motor! Just to make sure I liked the stain, I applied some to a piece of scrap wood. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. Fast forward a few months to the next time I had the tube outside. Here is what I was working on but looks like I need a better design. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! Please feel free to email me at the address on the right. The extra force will also focuser. I did run into a small problem with the focuser. As the telescope tilts toward the horizon, the mirror must be supported on its edge. I ended up modifying it a bit after printing. After the second call, I received a response that it would be ready at the end of the following week. A project collaboration and documentation platform. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). : "http://www. Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. I have no dog in this hunt whatsoever, but if people are impressed by these photographs and vote for it because of them when there's no proof that this scope generated the photos and there IS data to the contrary (see below), then that's certainly not fair to the other contestants. work really well, for a fraction of the cost of a commercial Crayford Install on Windows 10, this part is pretty straightforward. I was inspired to build telescopes during a trip out to McDonald Observatory in west Texas, where I saw a 36 fork-mounted telescope, tiny in comparison to the huge research telescopes at the site. A 6 in primary mirror does not have enough weight to make the dob stable. You need some purple bits I used my router to "mill" a flat area for better contact with the focus adjustment rod. It stalled when tension on the belt increased. Next, attach the eyepiece and the focuser to the top part of the telescope tube. both sides. You will have to line up the diagonal and primary so that you see a centered image of the sonotube opening and the spyder in the eyepiece hole. Before attaching the sides and front to the bottom with wood screws, I wanted to make sure those screws would not interfere with the Ebony Star ring that would be attached to the rocker bottom. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. Or rather, I hated it. It's rigid, lightweight, and Download and unzip. exactly 2" with adhesive labels placed one at a time inside the tube Some of the very best planetary and deep sky pics I have seen have come from a Fuji S3 professioanl camera [based on a Nikon body] and a Canon 20Da, which was designed with [I think] a user replaceable inside the mirror box filter for astral photography. This is not recommended for shared computers. You should watch (and bookmark) this video. I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. control. As the thread shows you could also build the dual speed version, all made of plywood, if you feel ready to tackle a slightly more complex project for a cost of about 5$ more. Obviously an open truss telescope. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. he might just have a $3200 camera, they aren't very hard to come by. 5 weeks after I had ordered the mirror, I called to ask about its status. Below are cutting diagrams and diagrams of the rocker and tube box with side bearings. Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. I also decided to make a separate mounting plate for the stepper motor, since I figured aligning the shafts precisely would be all but impossible. See the images how I plan to assemble it. I plan to use an FTA over it in case an extension is needed. case you need more focuser travel than you thought. This will determine the size of the coupler you will use to connect the stepper motor. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. To get this arc, I actually moved the radius of the jig, At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the.
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