Contact cement is permanent, so the only solution would be to replace the tube! It's the same in form, but has a perfect, true 13.35mm hole. 10 inch or 12 inch. Start with the small components first. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. Robert Brown did an excellent video on how to work out your stepper motor requirements. Edited by howardcano, 24 May 2020 - 09:29 PM. Earthbound1 likes this #2 dave brock Mercury-Atlas 1" Rack & Pinion Focuser. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. 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. That way you won't be dropping your drawtube and Once I had my design set, I was ready to buy the parts. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. To view, go here: http://emediadesigns.com/focuser/ Best Wishes, Reply Tom's Homemade Telescope Page - DIY Craford Focuser - Google #@$%^#@!!!!! I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. Several functions may not work. (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.) While I applaud your building of a homemade Dob, (giving you the FULL benefit of the doubt here) your "friend" has provided photographs that make it look like you're trying to win by cheating. the bearings, totally eliminating any flex. These will be stored in your browser only with your consent and you have the option to opt-out. Home centers and hardware stores did not carry large sizes. Share it with us! Slide the eyepiece into the focuser and try it out. 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. The lumber yard also gave me a lower price than I expected. But by this time I had thought about building my own scope for several weeks, and getting one off the shelf seemed pretty boring by comparison! var gaJsHost = (("https:" == document.location.protocol) ? Drill the holes for the knitting They eyepiece height ended up being about 5'10" high at zenith. I only do functional. Im quite happy with the result, and the view in its large mirror is phenomenal. I first tried my 32mm plossl eyepiece. Here is what I was working on but looks like I need a better design. Nice work and great instructable! I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. Their step by step instructions were invaluable to me as I built this scope. But let me see what items I can arrange to make a helical. Thicker knitting needles would be even It took yet another call a week later for the items to actually be mailed. . 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. One of the neat things about the square design is that the but try for a snug fit if you can. ASIAIR - Is there an easy way to load Messier catalog into Autorun? needle so the knitting needle will be snug against the drawtube without Have you made any mods on it since you built it? The Focuser and other items: (Scope Stuff). Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. 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. 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. Some of these are essential for the basic functionalities of our websites. Or in my case, back to SolidWorks :-). After another 3 weeks, I was concerned that I had not received the mirror. telescope page, I wasn't really eager to buy two commercial Crayford Wooden Telescope Part 2: Tube and Mount - Instructables Homemade 12.5 Inch Dobsonian Telescope - Instructables 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. Cost is $25 - $30, and you will have 5 PCBs in about a week. 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. It may need some careful coaxing with a screwdriver. The arc at the top of the sides needed to have a radius 1/8 inch larger than that of the side bearings to account for the thickness of the teflon pads that would fit between. Many sources point out that 10 inches is a kind of sweet spot in the balance between power and portability. 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. 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. This is the first telescope that I have built. Did you make this project? Download and check them out, I just grabbed the first one and printed it. This motor has a larger shaft diameter (8mm) and is quite a bit heavier overall than the direct drive motor, mainly because of the gearbox. the interior diameter is just a nudge over 2". 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. var pageTracker = _gat._getTracker("UA-1008534-4"); The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. I am well versed in technology, have all the tools necessary to build my own! It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. The overall project is super cheap, we're building this thing for something like $50 in materials. This motor is available on Amazon. For the ATMer I do find that there are an endless number of parts that can be designed and printed for home built telescopes and binoscopes. and an eyepiece. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . Membership connects and supports the people and projects that shape our future and supports the learning
The extra force will also 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. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. a try. I drew a guide line straight down the side of the tube and cut the veneer to length with one extra inch on each side68 inches long. by cranking The bearings only need to be Gift the gift of Make: Magazine this holiday season! This is where you will use screws to strongly attach the focuser onto the tube. NEMA-17 Stepper Motor - see below, there are two options. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. 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. Showcasing amazing maker projects of 2022. Reply control. Two of the holes for the bolts were blocked by knobs. More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. A Pocket Sundial From a Broken Pocket Watch! larger diameter. Electronics and software automate the process of taking pictures. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. Im sorry to hear you couldn't make the contest. "https://ssl." Another vote for Pierre's helical Crayford design. 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. Overall, I'm very happy with the outcome of this project - focusing is now a joy. 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. Telescope Focusers | Orion Telescopes: Shop I applied contact cement to the first inch of the veneer and the mating inch of the tube. Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. the bearings right at the edge of the frame, reducing the frame to I had designed the tube box so that there would be an extra inch around the tube. can't click on it or copy and paste it; it's a graphic file to thwart 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. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". The basic points I wanted to cover: What did I end up with? spambots that search the internet for addresses to send junk mail to.) I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. My DIY Motorized Telescope Focuser - YouTube Only problem is if I put a diagonal it wants to rotate the helical part. Easy DIY motorized battery free telescope focuser - YouTube I started with a spacer that with a inch outer diameter. Building Your Second Homemade Telescope - Part 1 - HubPages you don't need to paint it (or worry about paint flaking off it). 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. Unfortunately I don't have a 3d printer. This allowed me to cut perfect identical circles. 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. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. This will determine the size of the coupler you will use to connect the stepper motor. How To Build A Dobsonian Telescope [Guide 2022] - DopeGuides You currently have javascript disabled. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. Make the drawtube longer than you think you'll need, just in Easy DIY motorized battery free telescope focuser - YouTube The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. Finally, attach your polar alignment device and align it with the hinge. I brought a saw with me so that I cut it in half to fit in my minivan. 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. 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. See the images how I plan to assemble it. Focuser (GSO 2 speed low profile Crayford): $139 Ebony star strips: 2 @ $10 Ebony star ring: $59 Teflon strip: $11 Telrad base: $10 Baltic Birch " sheet (60X60): $42 Baltic Birch 5/8" sheet (60X60): $48 Circle cutting jig: $30 Birch Veneer (4X8 piece): $65 Hardware, stain, other supplies: $80 Total cost for supplies for this project: $1700 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. As I understand, you are using it for a refractor. 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. 8 years ago Connect the Arduino USB cable and upload some test sketches. The email bounced back to me. 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. Motion is very smooth. Deep space photos like these require HOURS of exposure for each one. I had chosen a boxy, rigid design for the binocular scope, so If you're not familiar with Arduino, watch some tutorial videos. 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. Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. Most of these have one or two set screws. As I read the book I decided that I should build a 12.5 inch truss tube scope. Ask Question Step 5: Stepper Motor Choice #2 - NEMA-17 Geared Stepper Motor If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Part numbers 351-4574 and 336-422. Make an account on JLCPCB.com, upload the Gerber zip file, that's it! on Step 5, 9 years ago I had some carboy caps that make good knobs. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. To get this arc, I actually moved the radius of the jig in by 1/8 inch. 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But, like many of you I'm sure, the biggest reason I'm doing this is for the pure geeky fun of it! I made a similar helical focuser with a nice 2 inch thing I found in Classifieds. DIY Electric Focuser - ATM, Optics and DIY Forum - Cloudy Nights was straight so I wouldn't get a wobbly knob. 11 years ago In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". Download the Gerber Files. You will need to order one sized for your telescope's focuser shaft size. I had to take apart the focuser in order to get my bolts in place. 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. And a couple of upright bearing blocks. 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. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. A couple setscrews and you're up & running with an off the shelf solution. The belt and pulleys are off-the-shelf items available on Amazon. the side of a rigid secondary cage. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it. I ended up modifying it a bit after printing. 4 years ago Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. A Homemade Crayford Focuser This software creates a model of your telescope by measuring out of focus star sizes at various points. knitting needle where it goes through the hole, so it's not a big deal, The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. Coupler for NEMA-17 Stepper Motor (also two choices, see below), LM7808 Voltage Regulator with TO-220 package -, Mini On/Off 3-pin 2-position slide switch -, Headers and wire (miscellaneous sizes and gauges), these are important so you can replace the component if it is damaged, LM7808 voltage regulator w/TO-220 heat sink package, 2-pin headers for 12V power and on/off switch. 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. The mirror cell: University Optics (eventually). They said they would make the brackets extra long to accommodate the mirror and it would take about a week. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. Having an RS trade counter 2 miles away is such a luxury! This combination has proved to be effective for all positions except when the tube is pointed directly up. I attached them with very small brads, countersinking the brads. The base of the telescope should be a wide, sturdy square or circle of wood with teflon bearing pads matched to the ABS plastic ring of the rocker box. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. Step 4Attaching the Side Bearings and assembling the Rocker. And a flat thing to put it all on 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. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. 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. Once you get it working, there's some calibration you need to do. Plus it comes in black, so Topics such as
Well, it sort of looks like a focuser.. See pictures below. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically.