Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. A project collaboration and documentation platform. For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of The Dobsonian Telescope by David Kriege and Richard Berry. 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. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . If you found some good surplus lenses, you will have made a stunningly good objective for your scope. wobbly knob still works, and adds character. Several clamps were used to hold the pieces together overnight. 5 weeks after I had ordered the mirror, I called to ask about its status. My homemade motorized telescope focuser for Celestron C8. As I understand, you are using it for a refractor. In my build, the minimum eyepiece-to-secondary mirror distance (13) plus the primary-to-secondary mirror distance (57) equals the focal length of 71, which is roughly 4.5 times the width of the 16 mirror. help eliminate slippage when the focuser is pointed straight upward. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. 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. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. 8 years ago Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. New Creation Tamil 6.96K subscribers Welcome to New Creation Tamil Our Channel include of Guiding Videos: 1.DIY Projects 2.Awesome Ideas 3.Tips You are inter with New Creation Tamil you can enjoy. Showcasing amazing maker projects of 2022. This is the first telescope that I have built. Un-real!!! That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. (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.) Feel free to take on that part if you like, but you're on your own :-). 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. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. I placed my telrad, optical finder, and an eyepiece on the focuser end of the tube and, using a broomstick as a balance point, found that the tube balanced 22 inches from the bottom. Read the documentation though, there are a lot of functions and options. This is not recommended for shared computers. Fairly easy to build and could be adapted to suit any SCT focuser. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. large in diameter (1.6") so that adds to the fine-ness of the focus When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. After the second call, I received a response that it would be ready at the end of the following week. If not, you may need to design and print your own bracket(s), gears, and so on. I wanted the long focal length for good contrast. The mount and tripod are pretty much useless for astrophotography. So I was looking for a cheap, light-but-sturdy design for a Share it with us! It would cost less and they have a very good reputation. Gift the gift of Make: Magazine this holiday season! One of the companies I had considered as a supplier for the primary mirror was Anttler's Optical. Bill, Impressive work and great idea about LSDF focuser. an eyepiece. Able to make myself using my own humble tools (or toys as the pros will call them!) Well, it sort of looks like a focuser.. See pictures below. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. control. I then attached the Ebony Star ring using contact cement. I didn't bother reading his whole article to figure out what f/# he used) I am not trying to say that good AP isn't possible with a sonotube scope, (the 'friend' may very well have pulled it out of the dob mount, added rings and a dovetail, and mounted it on his CGE-Pro or comparable) but in this case it is unlikely.". My wife helped me by moving the mirror into and out of the tube around the marked spot while I stood at the eyepiece trying to bring some distant trees into focus. small, it's surprisingly rigid. The balance point determines the height of the rocker sides, so I had to get this far before I cut the wood for the base. My first telescope I built was a 10" F8. You can view and download the full file here. but try for a snug fit if you can. Part numbers 351-4574 and 336-422. This might have been tempting if I wanted to build a 6 inch scopeat that size, they say that first-timers do pretty well at grinding and figuring their own optics. - Bill. you don't need to paint it (or worry about paint flaking off it). If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. 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. 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. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. Lining up this center point with the center of the top of the side bearing, I brought the corner of the side bearing up to the edge of the tube box and attached it with screws. Measure twice, drill Participated in the Celestron Space Challenge. The box should be deep enough to allow the mirror box to swing all the way down. 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. telescope page, I wasn't really eager to buy two commercial Crayford forces the knitting needle against the drawtube and the drawtube against ASIAIR - Is there an easy way to load Messier catalog into Autorun? Able to make myself using my own humble tools (or toys as the pros will call them!). This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. knitting needle where it goes through the hole, so it's not a big deal, "); The Artemis module works extremely well, and is to be strongly recommended. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. It uses a primary mirror to capture and reflect light, a secondary mirror to direct light into an eyepiece, and a focuser to make fine adjustments for viewing. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. 10 years ago Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. It is used to setup water outlet from overhead water tanks. by cranking A week later the cell arrived (on schedule) from University Optics. I knew that I would be returning the mirror cell to them, but just for fun I decided to see how it would fit in the tube. So, as they say, "back to the drawing board". Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. Although they don't usually sell these parts, because I had ordered the mirrors from them they offered to sell me the spider and secondary holder that they use in their scopes. I like the old way of using stepper motors and other stuff introduced years ago by Mel Bartels, he is a master for me. Whether you need a basic rack-and-pinion telescope focuser for your homemade telescope project or a premium Crayford-type model with dual-speed focusing as a performance upgrade, you have come to the right place. This motor is available on Amazon. eyepiece on the ground (or worse, on your primary mirror!) More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Im quite happy with the result, and the view in its large mirror is phenomenal. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. The original Crayford Focuser is on display there. astronowanabe, Pierre Lemay, LarsMalmgren and. Below are cutting diagrams and diagrams of the rocker and tube box with side bearings. The wide square footprint would make it pretty stable when mounted to $299.99 More About Telescope Focusers Once its cut to length, drill a hole through each end of the tubing with a drill press. on Step 5, 9 years ago Thanks again for the 'ible. crafts, science & engineering, design, and technology. I did run into a small problem with the focuser. focusers for that project. I laughed, packed up the cell with a long letter describing the series of events that led to the return, and put it in the mail. I am well versed in technology, have all the tools necessary to build my own! A 6 in primary mirror does not have enough weight to make the dob stable. Over how many nights did this photography session take place? Nice work and great instructable! the side of a rigid secondary cage. This design could be adapted to practically any telescope or focuser, so I've kept my outline on the project brief. I started by trying to drill out a metal gear for the focuser shaft. Here is a link to the main FILES area on Robert Brown's site. Share a cool tool or product with the community. Another vote for Pierre's helical Crayford design. I called to express my concern and was told that it had all been packaged a few weeks ago and that it, For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of, After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. I am a retired USAF electronics engineer, and might even do much of the construction of the base with welded structural tubing, as, I do have a complete metal working shop besides my wood shop, here. I told them to take their time and get it right. The secondary holder is adjustable, so I could didn't have to get the location perfect. I'm also going to focus on only one version of Robert's focuser (there are many). The sides were attached with wood glue and clamps with a few small brads to hold everything in place. ScopeStuff is awesome!! You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. You will need to order one sized for your telescope's focuser shaft size. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Some of these are essential for the basic functionalities of our websites. Funny how the bigger they are the better for dobs. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. 11 years ago The diameter of the focuser is usually indicated in inches. a "rubbery" feel. After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. If you go to buy all of the components for this project from dealers, you will see that you mostly have to buy at least 5 parts, sometimes bags of 50 parts! A week after they said they would send the secondary and other parts, I called to ask if things had been sent. This proved fatal for the stepper motor! On the bottom of the Bottom board is a ring of Ebony Star laminate that glides over the three teflon pads located directly above the feet on the ground board. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. needle so the knitting needle will be snug against the drawtube without Motion is very smooth. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . 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. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. The bearings only need to be If you mess up, you can turn the hole into a slot, but avoid If you are (for example) doing a focuser for a catadioptric telescope like a Celestron C-8 or similar, the focus knob has no load on it so this smaller, lighter motor will do the trick. It's rigid, lightweight, and A Pocket Sundial From a Broken Pocket Watch! I did not glue the bearings to the tube box in case I needed to adjust the position later. This unit takes signals from your computer and drives the stepper motor on the focuser. CNC files (optional) Download the Sketchup files. But, especially on cold evenings, the focus may go out in the middle of the night. A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". If you're going for simple, have you considered a helical focuser? DIY Craford Focuser. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. To glue the side bearings and rocker sides to full thickness, I covered a side with wood glue, then carefully lined up the pieces and put two small nails into the pieces to hold them in place. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . 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. weight. Rather than use a sheet of plastic Kydex to finish the tube, as recommended in K/B, I ordered a sheet of birch veneer. I've been using the above pair
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