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. This motor is available on Amazon. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. The plate has slotted screw holes for tensioning the 6mm belt. I did run into a small problem with the focuser. The focuser is very smooth. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. That way you won't be dropping your drawtube and Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. 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. Once the pieces were cut and I held them around the tube, I decided to cut them a bit smaller because the extra space was too much. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. my 12.5" trackball, but I didn't When you add the minimum distance from the eyepiece to the secondary mirror together with the distance from the secondary mirror to the primary, the total length should be the primary mirrors focal length. It's easy to shim it to and an eyepiece. I applied contact cement to the first inch of the veneer and the mating inch of the tube. A bit of a monster! Find a special something for the makers in your life. It interfaces to the computer via USB and comes with an ASCOM driver. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. I marked the spot and moved things back inside to install the mirror. The drawings are only approximately to scale. Since there is no drill bit that exactly matches the 13.1mm of the shaft, I had to do some rough enlargement of the hole. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . Funny how the bigger they are the better for dobs. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. I plan to use an FTA over it in case an extension is needed. 10 inch or 12 inch. The flat wants to be running parallel to the long axis of the tube. You really need a step ladder even for my 10" when pointed overhead. I think I got what I wanted and seems best solution for me. This cost around $100 to build and all of the components came from. Make the drawtube longer than you think you'll need, just in forward and back along with the drawtube when you focus, and you'll get OK, no, I do not have a homemade Crayford focuser but am planning to build a 3 incher for next years 17" reflector telescope project and to hold my new 30mm ES 100 degree EP. Or rather, I hated it. How to make diy focuser pvc - YouTube My plan for wrapping the tube seemed good, but I am not too pleased with the final result. I set things up in daylight and collimated the scope. Not sure how your toilets are built over there, but here they use what is called a tank flush valve. Once its cut to length, drill a hole through each end of the tubing with a drill press. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! I feel it is a wonderful thing to free oneself from the "store-bought" world, as Tombaugh did, and to use your imagination and skills to develop your own, personal way of viewing the sky. It features 2 semicircular arms, and mounting points for the trusses (T-nuts are fine), as well as a lid to keep the mirror safe when the telescope is not in use. The version number "312" here may change if Robert posts new firmware. I waited until dark and pointed the scope at the sky. Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. Motorise Your Own Telescope (updated 10-19-2017). - Instructables Motion is very smooth. If you're not familiar with Arduino, watch some tutorial videos. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. the side of a rigid secondary cage. It has a 6mm shaft. accessible by all ages and skill ranges. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. haven't yet found any design elements that need improvement. 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. Best Wishes, Reply 10 years ago Actually getting the parts into my hands turned out to be more of a challenge than I would have expected, but in the end, I have a wonderful telescope that I enjoy very much. It seems to There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. needle so the knitting needle will be snug against the drawtube without After researching several possible sources for a primary mirror, I decided to order an f/5 12.5 inch mirror from Discovery Optics. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. My secondary is 4; for tips on choosing size, click here. wobbly knob still works, and adds character. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. small, it's surprisingly rigid. This resulted in a gear that wasn't true and "wobbled" a bit. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Rock on! 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. I used one of these scrap pieces to draw an angle of 70 degrees to the edge of the arc so that I could later place the teflon pads on the arcs. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. Our websites use cookies to improve your browsing experience. . This will determine the size of the coupler you will use to connect the stepper motor. My first telescope I built was a 10" F8. A Pocket Sundial From a Broken Pocket Watch! knitting needle where it goes through the hole, so it's not a big deal, This allowed me to cut perfect identical circles. 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. Connect the Arduino USB cable and upload some test sketches. DIY Craford Focuser. a 3/4" thickness. Slide the eyepiece into the focuser and try it out. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. 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. When you figure out Tom's Homemade Telescope Page - Issac Newton Scope - Google 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! My guess is that photo was taken with a refractor. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. This makes for better sky photographs as the exposure time can be lengthened,. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. Im quite happy with the result, and the view in its large mirror is phenomenal. stronger, but would give me a coarser focus action because of their an eyepiece. Here's my 8" f/6 travel scope with a 2" PVC draw tube and the helical Crayford focuser built right in the focuser board. 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 This cost around $100 to build and all of the components came from Jaycar, except the brackets which were made with 1.2mm sheet metal. I've been using the above pair 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. . corners of the squares provide nice nooks for the eyepiece and eyepiece Save over 40% off the annual cover price for a full year (4 issues) of Make. astronowanabe, Pierre Lemay, LarsMalmgren and. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. (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.) Here is what I was working on but looks like I need a better design. 1" Rack & Pinion Focuser. Those are the last screws to be tightened. 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. I was finishing this inner debate when I got a copy of the book The Dobsonian Telescope by Kriege and Berry as a Christmas gift. Let me see if I can get similar plumbing parts here. Look down through the empty focuser. As I continued to read, however, I was struck by the many complications of the design and, frankly, how many ways I could screw it up. I read the entire thread and surely its going to help me building my focuser. The ARtemis module came in a kit form actually just two circuit boards one of which I had to source the parts, build and box myself. Homemade 12.5 Inch Dobsonian Telescope - Instructables They eyepiece height ended up being about 5'10" high at zenith. Please feel free to email me at the address on the right. 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. Thanks for the great comment. You should watch (and bookmark) this video. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. 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. This means I can use FocusMax to do the focusing. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. I started by trying to drill out a metal gear for the focuser shaft. I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. 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. It is not very powerful, it will not supply enough torque if you put any load on it or have a heavy optical train (like I do) and the focuser has to "pull" it upward when the telescope is vertical. needle to be just a little too flexible for the weight of a diagonal and my thoughts naturally gravitated toward a boxy focuser to go with it. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. drneilmb, thanks for sharing the focuser design. Depending on your telescope, one of the Brackets that Robert has may work for you. I used a hole saw to cut a wooden plug to fit inside the I then attached the Ebony Star ring using contact cement. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. Your astrophotographer friend may have included his own images from his setup. To view, go here: http://emediadesigns.com/focuser/ The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). This unit takes signals from your computer and drives the stepper motor on the focuser. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. To hold the tube in place within the tube box, I used a combination of pieces of felt inside the box and wooden shims between the tube and the box. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). The email bounced back to me. Crayford focusers are considered superior to entry-level rack and pinion They said they would make the brackets extra long to accommodate the mirror and it would take about a week. Wooden Telescope Part 2: Tube and Mount - Instructables We are now ready for some testing. I tried this one first and found it wouldn't work for my application. It is used to setup water outlet from overhead water tanks. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. My telescope is the Orion ED80T-CF. The project creator Robert Brown made a good video on testing the board. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. With Simple, Homemade Telescopes, You Can Explore the Stars (Op-Ed) Nice work and great instructable! Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. You need to order it sized for your focuser shaft size. However more than the focuser, I liked your scope. I ended up modifying it a bit after printing. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. until a 2" eyepiece or 1.25" adapter is snug. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. CNC files (optional) Download the Sketchup files. Tom's Homemade Telescope Page - Udder Nonsense - Google 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. As I understand, you are using it for a refractor. In my case I decided to make a custom bracket. 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. The 2-1.25" adapter is a sink drain slip fitting in 1-1/4" size that slips into the large tube for 1.25 EP's. The focuser knob had two set screws. Also no obvious diffraction spikes in the m31 photo. 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. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. I did not wrap the tube until I had completed the base. Download and unzip. Attach the ball head to the top board. 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. 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. Measure twice, drill

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