I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. What materials did you use? It would cost less and they have a very good reputation. I then temporarily installed the secondary mirror so that I could measure the approximate distance to the center of the secondary in order to locate the holes for the focuser. 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. 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. I tried this one first and found it wouldn't work for my application. I made a similar helical focuser with a nice 2 inch thing I found in Classifieds. I only use the OTA. It just (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.) 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. Able to make myself using my own humble tools (or toys as the pros will call them!) Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! I have not yet figured out a better way to hold the tube. To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. on Introduction. Fairly easy to build and could be adapted to suit any SCT focuser. The curved sides of the Side Bearings are also covered with strips of Ebony Star that glide on the teflon pads on the curved edges of the Rocker Sides (figure 3). 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. The last time I checked, that particular SBIG camera used on TelescopeGeek had an eight month lead time.A 20" scope gathers 2.6 times more light than a 12.5" scope, therefore equivalent exposures on this one would take 200+ minutes, at least. Move the jigs until you can comfortably place a variety of eyepieces in the focuser and get a sharp image, then carefully measure the separation distances. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. Also no obvious diffraction spikes in the m31 photo. 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. NEMA-17 Stepper Motor - see below, there are two options. I began building it in the spring of 2008, but the bulk of the work was done in July of 2008 with first light occurring on July 25. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. You need some purple bits i am not trying to win this contest with photos. I suppose that one could complete this project without these two tools, but it would be difficult to cut the pieces accurately enough for a good fit. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. I set things up in daylight and collimated the scope. Unbelievable! Topics such as After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. ill ask him for a detailed list of what he used and when i get that ill post it here for you. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. Attach the ball head to the top board. Only problem is if I put a diagonal it wants to rotate the helical part. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement. I Hope to give you ideas if you are thinking about building one for yourself! This is my copy of the telescope that Sir Isaac Newton presented to the Royal Society of London in 1671, and is considered to be the first successful reflecting telescope. A Pocket Sundial From a Broken Pocket Watch! You will need to order one sized for your telescope's focuser shaft size. I called to express my concern and was told that it had all been packaged a few weeks ago and that it should have been sent. I used a hole saw to cut a wooden plug to fit inside the Telescope Magazine. Slide the eyepiece into the focuser and try it out. Fire up focusmax, and shoot some images! All i did was supply the telescope as far as his camera equipment i dont know what he used i never saw it all i know is he had my scope for about a month while i was traveling and he gave me these photos. It stalled when tension on the belt increased. I am using scrap upvc pipe material. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. The flat wants to be running parallel to the long axis of the tube. The last chapter of the book describes a plan for an 8 inch sonotube dob with a few design elements from their truss design, and, as I read that chapter, the simplicity of its construction was very appealing. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. It may need some careful coaxing with a screwdriver. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). Please feel free to email me at the address on the right. That helps with low-profile I attached small felt pads to the inside of the keepers to protect the side bearings from scratches, but discovered that the side bearings would not fit because of the thickness of the pads. When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. Just to make sure I liked the stain, I applied some to a piece of scrap wood. Over how many nights did this photography session take place? Im sorry to hear you couldn't make the contest. the nylon screws going up from the bottom, but I found the knitting The focuser knob had two set screws. I did run into a small problem with the focuser. surfaces to put the bearings in and a vee at the bottom that would hold Those are the last screws to be tightened. I was still doing some construction on the morning of the event, but I succeeded in making first light on that clear, dark night in late July. The motor is much lighter than the geared motor. I like the old way of using stepper motors and other stuff introduced years ago by Mel Bartels, he is a master for me. 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.". I don't *do* pretty. This combination has proved to be effective for all positions except when the tube is pointed directly up. 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. This means you lose much of the night's images. Next, attach the eyepiece and the focuser to the top part of the telescope tube. 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. Contact cement is permanent, so the only solution would be to replace the tube! We then spread contact cement over the remaining veneer and tube surface, waited for the glue to dry, and carefully rolled the tube over the veneer. rod for the drive axle it would have a fairly fine motion. Read the documentation though, there are a lot of functions and options. case you need more focuser travel than you thought. 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. Using a compass, I drew lines for the inside and outside of the Ebony Star ring on the top and bottom of the rocker bottom. (actually, it ended up a smidge more than 2 inches). With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. I first tried my 32mm plossl eyepiece. But who cares, really? A 6 in primary mirror does not have enough weight to make the dob stable. Then it was time to stain and finish. a try. SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. If you enter it in the next contest please let me know and i will make sure to vote for you. 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. 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. The current needs to be adjusted on the DRV8825. However more than the focuser, I liked your scope. These will be stored in your browser only with your consent and you have the option to opt-out. In order for the Rocker Box to pivot on the Ground Board, a center pin is placed in a hole at the exact center of the Ground Board and Rocker Bottom. This consists of a small black box of electronics. In addition, we use third-party cookies to help us analyze and understand usage. 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! We are now ready for some testing. 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 started with a spacer that with a inch outer diameter. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. a 3/4" thickness. It was important that the two circles be identical because the edges had to match perfectly when glued together and the two side bearings had to be identical in order for the altitude motion to work well. The bearings only need to be Most people will want a knob on Crayford-style design with four bearings and one driveshaft. 4 years ago on Step 3. 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. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. And bolt to scope For my project I needed a 14 inch diameter, and I had a tough time finding one. 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. I could not find a spacer to fit my 9/16 hole, so I bought the 11/16 spacer (1 1/8 long because that's what the store had) and a bit of the same size. I drilled the holes in the center of the ground board and rocker bottom using a 9/16 bit, thinking that I needed the extra 1/16 so that the spacer could move. Rack & Pinion: For many years the standard focuser was of the rack-and-pinion type - a small pinion gear moved the flat toothed rack that was attached to or built into the moving focusing tube that holds the eyepiece.However, this geared system was far from ideal, with some wobble due to the friction fit between the fixed and moving tubes and backlash due to the gears. Edited by howardcano, 24 May 2020 - 09:29 PM. More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? I was certain not to move the jig at all before cutting the second circle. The email bounced back to me. In scaling up the K/B 8 inch design, I made a few changes that, I hope, will improve the design for 12.5 inch aperture. I would love to see your build when you are finished with it . Helical is one of the option i am considering.
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