They even offered to send the spider, secondary holder, and secondary mirror immediately so that I could begin working on the tube while I waited for the primary. A project collaboration and documentation platform. 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. 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. drneilmb, thanks for sharing the focuser design. Finally, I glued a strip of Ebony Star laminante to the curves edge of each side bearing using contact cement, using a flush edge bit on a router to bring the edge of the laminate even with the edge of the wood after the cement had set. Save over 40% off the annual cover price for a full year (4 issues) of Make. The email bounced back to me. Gift the gift of Make: Magazine this holiday season! An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. 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. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. This unit takes signals from your computer and drives the stepper motor on the focuser. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. I ground and figured the mirror with little troubles, making my focault tester, etc. I first tried my 32mm plossl eyepiece. 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. needle so the knitting needle will be snug against the drawtube without Fairly easy to build and could be adapted to suit any SCT focuser. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. 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. If you're not familiar with Arduino, watch some tutorial videos. The Dob is really a great design. 7 years ago Building the mirror box is tricky, because the entire optical assembly (mirror cell, mirror box, trusses, secondary cage) must balance at the center of rotation of the arms. Able to make myself using my own humble tools (or toys as the pros will call them!) 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. Start with the small components first. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. case you need more focuser travel than you thought. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. The overall project is super cheap, we're building this thing for something like $50 in materials. tube and nut that fits the outside threads. 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. spambots that search the internet for addresses to send junk mail to.) (actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. I attached them with very small brads, countersinking the brads. The cell from Anttler's, for which I had received a refund, had arrived. Featured in the February, 2015 issue of Sky & Thank you for your pages. Until I see photos of this scope setup for these pictures and an explanation of the exact equipment used, I cannot believe that these pictures were taken with this OTA. on Step 3. occurred to me that a square turned 45 degrees would give me two flat After another 3 weeks, I was concerned that I had not received the mirror. 4 years ago Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). And, once your telescope is finished, be sure to join a local astronomy club to learn more about the sky and share your hobby with others. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. really stiff and light for their size, and even though a #2 is pretty The mirror cell: University Optics (eventually). When you figure out It was easy enough to drill a hole and tap threads for a accessible by all ages and skill ranges. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. Wooden Telescope Part 2: Tube and Mount - Instructables Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. I read the entire thread and surely its going to help me building my focuser. Here is what I was working on but looks like I need a better design. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. But, especially on cold evenings, the focus may go out in the middle of the night. $299.99 More About Telescope Focusers A couple setscrews and you're up & running with an off the shelf solution. Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. Several functions may not work. I also have an extended photographic build diary of this telescope posted on Imgur. } catch(err) {}, SH-232 Sharpless sh-232, sh-231, sh-233, sh-235, NGC2174 Monkey Head Nebula, Sharpless 252, Sh2-252, HDW3 Hartl-Dengel-Weinberger 3 PN G149.4-09.2, SH-198 Sharpless 198, Soul Nebula, IC1848, NGC281 IC11, Sharpless Sh2-184, Pacman Nebula, SH2-173 SH2-173 Phantom of the Opera LBN 593, SH2-168 Sharpless HII regions. A few months later I ordered some other things from Scopestuff, including strips of Ebony Star laminate for the side bearings, a ring of Ebony Star for the rocker bottom, a strip of teflon to cut pieces for the ground board and side bearings, and a new base for my Telrad finder. Overall, I'm very happy with the outcome of this project - focusing is now a joy. Given that you can make the drawtube any length you The Crayford Focuser and DIY Focuser for Homemade Telescope An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. I'm' glad I did, because I didn't like the first color that I had chosen. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Our websites use cookies to improve your browsing experience. Someone is pulling someone's leg here. on Introduction. i am not trying to win this contest with photos. Crayford-style design with four bearings and one driveshaft. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. Homemade 12.5 Inch Dobsonian Telescope - Instructables The next day my wife called me at work to tell me a box had arrived with telescope stuff. 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. However more than the focuser, I liked your scope. both sides. 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 found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. experimented with various wires and rods and eventually decided that a DIY focuser design - ATM, Optics and DIY Forum - Cloudy Nights To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. I started by trying to drill out a metal gear for the focuser shaft. Today I purchased what is called atank nipple in India. As the authors describe the benefits of a truss design, it is hard to dispute their arguments. I set things up in daylight and collimated the scope. on Introduction. Crayford focusers are considered superior to entry-level rack and pinion The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! Here's a detailed response from a thread at CloudyNights:http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255 "The image scale is wrong on the M31 image, fits too much of the galaxy in for even a 35mm chip. After another 3 weeks, I was concerned that I had not received the mirror. Participated in the Celestron Space Challenge. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. 4 years ago The little app is simple and works great. Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. Move the jigs until you can comfortably place a variety of eyepieces in the focuser and get a sharp image, then carefully measure the separation distances. can't click on it or copy and paste it; it's a graphic file to thwart A bit of a monster! You need a drawtube of course. The part is very strong! I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! Unfortunately I don't have a 3d printer. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. small, it's surprisingly rigid. Once its cut to length, drill a hole through each end of the tubing with a drill press. I would love to see your build when you are finished with it . Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. See above, this motor does not produce a lot of torque, but you don't need much for this application since there is no 'load' on the focusing shaft. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. In addition, we use third-party cookies to help us analyze and understand usage. Just as it was about to come into focus, the focuser bottomed out. Helicals are adaptable to both refractors and reflectors, but do not "play nice" with zoom eyepieces because "zooming" becomes a two handed operation to avoid changing focus. Depending on your telescope, one of the Brackets that Robert has may work for you. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Part numbers 351-4574 and 336-422. Orient this assembly to allow you to view an object on the far horizon. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. You can see that my Moonlite focuser was slightly larger than the sides of the tube. I was certain not to move the jig at all before cutting the second circle. I had initially allowed for more of a gap, but realized once I cut the pieces and held the tube inside them that my gap was too large. 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. I had already made a lightweight focuser for How to build a 12.5 inch closed tube Dobsonian telescope. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. You reach a point where the picture doesn't seem to change much, so you never know where the very sweetest spot in the focus is. I waited until dark and pointed the scope at the sky. DIY Remote Telescope Focuser - YouTube This project is based on Robert Brown's "Arduino ASCOM Focuser Pro2 DIY". I ended up modifying it a bit after printing. I also wanted to strengthen and protect the cardboard tube. . and an eyepiece. Keeping with the 'simple ' part of your request, here is a helical 2"/1.25" focuser made from std plumbing parts. Crayford-style design with four bearings and one driveshaft. A Homemade Crayford Focuser 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. 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. Download and check them out, I just grabbed the first one and printed it. The focuser is very smooth. I only do functional. The day I received the refund, I ordered a mirror cell from University Optics. but try for a snug fit if you can. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. Tom's Homemade Telescope Page - Udder Nonsense - Google Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. All that remained was to design and print a bracket, and buy the needed parts. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. Let me see if I can get similar plumbing parts here. This makes for better sky photographs as the exposure time can be lengthened,. Please re-enable javascript to access full functionality. This design could be adapted to practically any telescope or focuser, so I've kept my outline on the project brief. 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. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). A wide hole will let the knitting needle creep DIY Truss Dob input: How to design truss? 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. focusers for that project. I added three inches for a margin of error and in case I need to rebalance the tube in the future, making a distance of 25 inches from the balance point of the tube to the rocker bottom. forward and back along with the drawtube when you focus, and you'll get I did not glue the bearings to the tube box in case I needed to adjust the position later. and hope it doesn't fall off 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. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. By adjusting the bolts, the mirror can be pointed toward the correct spot. 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. astronowanabe, Pierre Lemay, LarsMalmgren and. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. I file a dispute with Paypal to begin the process of getting my money back. The wide square footprint would make it pretty stable when mounted to Here is a link to the main FILES area on Robert Brown's site. Some quick tips to note if you are making a homemade telescope are: 1. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. A Pocket Sundial From a Broken Pocket Watch! Im quite happy with the result, and the view in its large mirror is phenomenal. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. large in diameter (1.6") so that adds to the fine-ness of the focus It was May 12th. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. you don't need to paint it (or worry about paint flaking off it). As I set of the scope, several club members came over to check things out and it was nice to hear the positive comments on the appearance of the scope. Below are cutting diagrams and diagrams of the rocker and tube box with side bearings. I centered the focuser 8 inches from the top of the tube, using a 2.5 inch hole drilling saw with smaller holes for the bolts that would hold the focuser. CNC files (optional) Download the Sketchup files. with a genuine question or comment about the design. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. The current needs to be adjusted on the DRV8825. curated by us, the people behind Make: and the Maker Faire. 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. I decided that my best option was to scale up their 8 inch design for a 12.5 inch scope and sacrifice the portability and easier storage of a truss scope for something that I felt confident in building myself. Membership connects and supports the people and projects that shape our future and supports the learning it sticks into your light path. Only problem is if I put a diagonal it wants to rotate the helical part. Drill the holes for the knitting 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. (actually, it ended up a smidge more than 2 inches). Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. work really well, for a fraction of the cost of a commercial Crayford Read the documentation though, there are a lot of functions and options. 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. Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. a 3/4" thickness. As I read the book I decided that I should build a 12.5 inch truss tube scope. 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 have several of the books on building a Dobsonian Telescope. But let me see what items I can arrange to make a helical. Able to shift heavy loads of kit ie over 1000g. 11 years ago Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. It is used to setup water outlet from overhead water tanks. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. You need to order it sized for your focuser shaft size. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. This focuser (see pic at bottom) was motorised by me several years ago, but the motorised system didn't give me very fine control, and the motor running at fast speed tended to make the Artemis camera crash. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. initiatives for the next generation of makers. This is the first telescope that I have built. 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. 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 In my case I decided to make a custom bracket. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. 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. - Bill. Feel free to take on that part if you like, but you're on your own :-). I tried this one first and found it wouldn't work for my application. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. Once I decided to build a scope myself I had to decide on the aperture of the scope. These will be stored in your browser only with your consent and you have the option to opt-out. Rock on! Homemade astronomy.
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