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The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. My secondary is 4; for tips on choosing size, click here. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. 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. Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, Soft-sensor-saurus | an E-textile Soft Sensor Soft Toy With LED Light. Just as it was about to come into focus, the focuser bottomed out. A 10 inch scope would not be very much longer or heavier than my 6 inch, yet it would allow me to see much more. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. small, it's surprisingly rigid. Fairly easy to build and could be adapted to suit any SCT focuser. We all know the problems with focusing. I have not yet figured out a better way to hold the tube. I took the whole tube assembly outside. Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. The little app is simple and works great. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. 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. with a genuine question or comment about the design. 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 interior diameter is just a nudge over 2". I attached them with very small brads, countersinking the brads. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . I have seen some VERY impressive photos similar to those, taken with Nikon D700 and D300 cameras, with the proper filters- and mounts- on a quality scope. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. until a 2" eyepiece or 1.25" adapter is snug. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. The Dob is really a great 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. But -- you have to be careful that the mechanism is true and the motor does not have a load on it at any time, otherwise it will 'stall' and stop moving. It doesn't. A tilted focuser will have no effect on the image quality. With an outer diameter of 14 3/16, I cut the Tube Box sides 15 5/8 and 14 5/8slightly less than my extra inch extra on each side. After going over the surfaces with a tack cloth to pick up the saw dust, I applied the stain and went over it with cheese cloth rags for an even finish. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! A week after they said they would send the secondary and other parts, I called to ask if things had been sent. tube and nut that fits the outside threads. My DIY Motorized Telescope Focuser - YouTube I use a 3D printer and an old gear motor to create an electronic telescope focuser.This is my first attempt at voiceover, I'm using a headset. My telescope is the Orion ED80T-CF. focuser. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. What materials did you use? CNC files (optional) Download the Sketchup files. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. Have you made any mods on it since you built it? Interfaced with a computer, so the computer can make the decisions about where the best focus is. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. 5 weeks after I had ordered the mirror, I called to ask about its status. For my project I needed a 14 inch diameter, and I had a tough time finding one. A decent machinest will do a far better job, but, there is always a lot more pleasure to be gained per astrophoto when you make bits yourself. Crayford-style design with four bearings and one driveshaft. Deep space photos like these require HOURS of exposure for each one. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. I had some carboy caps that make good knobs. I got a different stain, tested it, and went back to work. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. homemade Crayford focuser. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. together tech enthusiasts, crafters, educators across the globe. In my case I decided to make a custom bracket. astronowanabe, Pierre Lemay, LarsMalmgren and. The version number "312" here may change if Robert posts new firmware. 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. accessible by all ages and skill ranges. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. Other supplies that I bought for this project include wood, various bits of hardware, stain and finishing supplies, and a circle cutting jig for a router. I suspected that the company was either in trouble or no longer in business. 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. 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. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. My other telescope is a Celestron NexStar C6E. For about $3 we can buy a tank valve kit that has a threaded 2" i.d. Shorter thread side will be used to attach the eyepiece. I don't *do* pretty. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. Im sorry to hear you couldn't make the contest. Thanks Bob. how much travel you actually need, you can cut the tube off so none of Im quite happy with the result, and the view in its large mirror is phenomenal. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. I am well versed in technology, have all the tools necessary to build my own! on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. on Introduction. The Artemis module works extremely well, and is to be strongly recommended. The only thing on the list that was a bit difficult to find was baltic birch plywood, which had to be special ordered from the lumber yard. Read the documentation though, there are a lot of functions and options. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. I had chosen a boxy, rigid design for the binocular scope, so It was May 12th. I had cut the 12 foot tube in half in order to get it home in the first place, and a 6 foot section was the right size to work with for my f/5 12.5 inch. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. the nylon screws going up from the bottom, but I found the knitting knob, and a drill press to make sure the hole for the knitting needle 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. A Pocket Sundial From a Broken Pocket Watch! Several functions may not work. The base and the rocker box in my telescope are secured with a skate bearing assembly but could be more simply attached with a bolt through the center. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. A Pocket Sundial From a Broken Pocket Watch! And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. Able to shift heavy loads of kit ie over 1000g. The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. love to hear from people who are interested in this focuser design. It stalled when tension on the belt increased. work really well, for a fraction of the cost of a commercial Crayford the bearings right at the edge of the frame, reducing the frame to Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. I wanted the long focal length for good contrast. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. that is a great website that guy has some fantastic photos. You can see that my Moonlite focuser was slightly larger than the sides of the tube. #2 knitting needle would be just about right. Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! It took a lot longer than I expected to receive my mirror and other parts from Discovery. Thanks for your article. The plastic will ride on teflon pads, creating just enough traction for the telescope to avoid sliding on its own while not making it too difficult to point at things in the sky. 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 had the thought that as long as I was going to build it I should build it as big as I could afford. When you figure out After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. A week later the cell arrived (on schedule) from University Optics. experimented with various wires and rods and eventually decided that a The flat wants to be running parallel to the long axis of the tube. Most people will want a knob on My concern turned to alarm when my wife told me that Discovery had charged the balance due on all items to my account a few weeks earlier. ill ask him for a detailed list of what he used and when i get that ill post it here for you. I think I got what I wanted and seems best solution for me. I wanted to finish that instructable before the contest ended but was too late :-). Once Id built a CNC router, I embarked on my third telescope, featuring a 16 primary mirror with aluminum trusses, wide vertical bearing arcs, a steel front-adjustable mirror cell, and a rotating base. 24 T-nuts, with matching 2 bolts and knobs, 8 Aluminum tubing, thin wall, 1 square, 4 lengths I got mine from Cycle 24, Black woven velveteen, 68 Cut it so it stretches along the 6 axis. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. corners of the squares provide nice nooks for the eyepiece and eyepiece But let me see what items I can arrange to make a helical. I only do functional. Your design is simple and nice. The day I received the refund, I ordered a mirror cell from University Optics. I'm' glad I did, because I didn't like the first color that I had chosen. My first telescope I built was a 10" F8. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. The drawings are only approximately to scale. Rock on! After another 3 weeks, I was concerned that I had not received the mirror. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. Then it was time to stain and finish. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. 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. on Step 5, After much debit and doubt i have taken the photos down cause i cannot be 100% sure that they were taking from my scope as i was not there to verify them and i do not want my contest entry to be based on photos and not the build process. I didn't receive any confirmation email after a few days, so I tried to send them an email. I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. Two inch internal diameter drawtube. exactly 2" with adhesive labels placed one at a time inside the tube Homemade astronomy. My homemade motorized telescope focuser for Celestron C8. This consists of a small black box of electronics. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. can't click on it or copy and paste it; it's a graphic file to thwart The plate has slotted screw holes for tensioning the 6mm belt. LVLaserTech is right please do not vote for the pictures my instructable is for the build of the telescope not the quality of the photos.and as i said before i was not there is there a possibility that he sent me the wrong photos sure is there a possibility that he used a different mount than the one i saw sure is there a possibility that he is lying to me me about what he did sure. So, as they say, "back to the drawing board". 11 years ago His project is very well documented. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. both sides. on Introduction. The length of the Rocker Front also had to be changed so that the outside edge of the Side Bearings matched the outside edge of the Rocker Sides precisely. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. DIY Truss Dob input: How to design truss? Now I can simply insert the PVC cap on the end of a 4" pvc tube. The box should be deep enough to allow the mirror box to swing all the way down. I file a dispute with Paypal to begin the process of getting my money back. 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. The project creator Robert Brown made a good video on testing the board. on my binocular scope for quite a while now and really like them. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! 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. Able to shift heavy loads of kit ie over 1000g. This can be shimmed out with paper wrapped around the Those are the last screws to be tightened. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. I phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. The bearings only need to be Let me see if I can get similar plumbing parts here. A Pocket Sundial From a Broken Pocket Watch! All Dobsonian telescope projects are unique buildshere are the notes from my latest version to help get you familiar with the process and determine how youll design yours. This resulted in a gear that wasn't true and "wobbled" a bit. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. 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. an inch or so apart, so the focuser body could be pretty low profile. At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the Rochester Astronomy Club. I want to put my 12.5 mirror in a collapsible structure so I can haul it easy, Say a truss tube design, 7 years ago You will need to order one sized for your telescope's focuser shaft size. Now attach the screw eyes and the rubber band on the side of the board. flexing. I I did run into a small problem with the focuser. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. If you're going for simple, have you considered a helical focuser? Finally, attach your polar alignment device and align it with the hinge. Thanks Peter. This was to allow the circle cutting jig to be attached to the board to cut the arcs from a center point of 25 inches above the ground. Two of the holes for the bolts were blocked by knobs. I Hope to give you ideas if you are thinking about building one for yourself! The focuser is the part of the telescope that holds the eyepiece or camera, and by moving in or out, closer or farther from the . Here is a link to the main FILES area on Robert Brown's site. On that noteWARNING:do not look directly into the sun and never point a telescope into the sun without proper filtration you can damage your telescope and burn your retinas and possibly go blind i am not a astrophotographer so i cant comment on the quality of the pictures since there is so much doubt on the photos i will gladly take them down. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. His passion is using CAD design and his homemade CNC router to bring large wood projects to life. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. Maker-written books designed to inform and delight! $299.99 More About Telescope Focusers I do have another tube that can be used around the drawtube, but it doesn't really add anything. But who cares, really? I wasn't there so i can be 100% but i do not think my friend was lying to me and i believe the pictures are from my telescope my kids use it for stargazing a lot i have seen some deepspace but i use it mainly for sketching the moon and i like to view solar flares. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. I read the entire thread and surely its going to help me building my focuser. initiatives for the next generation of makers. I have no idea how much mail this idea will generate, so I can't I applied contact cement to the first inch of the veneer and the mating inch of the tube. . The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. 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. See the images how I plan to assemble it. Also, I will work with my computer geek buddies, so that we eventually automate it using Linux on a Rock64, to run kstars for tracking, on INDI.