4 years ago Deep space photos like these require HOURS of exposure for each one. There are some test sketches in the "Tests" folder, start with those. Telescope Focusers | Orion Telescopes: Shop 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. 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. Measure twice, drill NEMA-17 Stepper Motor - see below, there are two options. It's easy to shim it to 4 years ago The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. This can be shimmed out with paper wrapped around the 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. You will look through these as you rotate the wheel. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. (A badly tilted focuser may subtly alter the illumination pattern of the focal plane to a degree that would be impossible to perceive visually but that's about it.) wobbly knob still works, and adds character. The next day my wife called me at work to tell me a box had arrived with telescope stuff. Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. Two inch internal diameter drawtube. 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. #2 knitting needle would be just about 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. A project collaboration and documentation platform. 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. We were careful to press out any bubbles as we went, but when the job was done we found that there were multiple bubbles in the veneer. The hole is made slightly larger than the shaft, this is normal. Make the drawtube longer than you think you'll need, just in 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. I then attached the Ebony Star ring using contact cement. the bearings right at the edge of the frame, reducing the frame to DO NOT drill out the holes in the board! And a flat thing to put it all on Stellafane The Focuser both sides. 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. Fast forward a few months to the next time I had the tube outside. As I understand, you are using it for a refractor. I was certain not to move the jig at all before cutting the second circle. My secondary is 4; for tips on choosing size, click here. DIY Craford Focuser. I started with a spacer that with a inch outer diameter. corners of the squares provide nice nooks for the eyepiece and eyepiece 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. You should watch (and bookmark) this video. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); on my binocular scope for quite a while now and really like them. I will post the pic of final focuser once ready. Save over 40% off the annual cover price for a full year (4 issues) of Make. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. These will be stored in your browser only with your consent and you have the option to opt-out. The plate has slotted screw holes for tensioning the 6mm belt. Finally it was etched in caustic soda, and anodised matt black. I built a second set of electronics, and I had the NEMA 17 Direct Drive motor left over since it didn't work for my Orion ED80T-CF refractor. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . 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. needle adds no friction that I can feel to the focus action. 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. Please re-enable javascript to access full functionality. We use cookies to continuously improve our websites for you and optimize its design and customization. Rock on! I welded mine from steel square tubing. 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 have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. Earthbound1 likes this #2 dave brock Mercury-Atlas 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. Having an RS trade counter 2 miles away is such a luxury! One of the neat things about the square design is that the As the authors describe the benefits of a truss design, it is hard to dispute their arguments. However more than the focuser, I liked your scope. 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. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. That helps with low-profile I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. When you figure out 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. I told them to take their time and get it right. on Introduction. Make the hole diameter fairly snug, too. 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. In addition, we use third-party cookies to help us analyze and understand usage. I brought a saw with me so that I cut it in half to fit in my minivan. Also no obvious diffraction spikes in the m31 photo. guarantee a response, but I'll do my best to answer everyone who writes If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. It is used to setup water outlet from overhead water tanks. It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. 5 weeks after I had ordered the mirror, I called to ask about its status. Let me see if I am able to collect all the parts needed. PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. that is a great website that guy has some fantastic photos. 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! Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). If not, you may need to design and print your own bracket(s), gears, and so on. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. Thanks for the great comment. 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. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. 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. 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. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. he might just have a $3200 camera, they aren't very hard to come by. After the second call, I received a response that it would be ready at the end of the following week. Thanks for your article. 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. Next, attach the eyepiece and the focuser to the top part of the telescope tube. 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 want to make this direct drive system work. . More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? When you want to focus, you just open the program and press focus. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. If you're going for simple, have you considered a helical focuser? Put it all together Nice looking telescope. 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. I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. I tried this one first and found it wouldn't work for my application. This might have been tempting if I wanted to build a 6 inch scopeat that size, they say that first-timers do pretty well at grinding and figuring their own optics. ill ask him for a detailed list of what he used and when i get that ill post it here for you. This is the first telescope that I have built. Crayford focusers are considered superior to entry-level rack and pinion Finally, attach your polar alignment device and align it with the hinge. (Sorry you I am well versed in technology, have all the tools necessary to build my own! 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. My DIY Motorized Telescope Focuser - YouTube Thanks Bob. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . You need a drawtube of course. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. Contact cement is permanent, so the only solution would be to replace the tube! 11 years ago Thicker knitting needles would be even Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. It stalled when tension on the belt increased. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. But, especially on cold evenings, the focus may go out in the middle of the night. I also wanted to strengthen and protect the cardboard tube. surfaces to put the bearings in and a vee at the bottom that would hold Perfect for astrophotography or during high power planetary observation. I paid the 50% deposit and dreamed of DSOs. The mirror cell: University Optics (eventually). CNC files (optional) Download the Sketchup files. - Bill. 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. I had some carboy caps that make good knobs. Thanks Pinbout for sharing your design. Share it with us! I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. 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. 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. Membership connects and supports the people and projects that shape our future and supports the learning I wanted the long focal length for good contrast. Im sorry to hear you couldn't make the contest. Please feel free to email me at the address on the right. Upload that main sketch to the Nano. The mount and tripod are pretty much useless for astrophotography. The cost is a bit more than some of the other combinations, but by only $10 or $20. 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. Today I purchased what is called atank nipple in India. 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. A 6 in primary mirror does not have enough weight to make the dob stable. You need to order it sized for your focuser shaft size. 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. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. I would love to see your build when you are finished with it . Download and check them out, I just grabbed the first one and printed it. Easy DIY motorized battery free telescope focuser - YouTube Fairly easy to build and could be adapted to suit any SCT focuser. on Introduction, Very nice build nikon20. Now attach the screw eyes and the rubber band on the side of the board. I also wanted to buy the other mechanical partsmirror cell, spider, secondary holder, and focuserso that the performance of these pieces was not limited by my skills. A Pocket Sundial From a Broken Pocket Watch! Drill the holes for the knitting If you wanted to really go low-profile with this design, Reply 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. I have no dog in this hunt whatsoever, but if people are impressed by these photographs and vote for it because of them when there's no proof that this scope generated the photos and there IS data to the contrary (see below), then that's certainly not fair to the other contestants. 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 After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. You really need a step ladder even for my 10" when pointed overhead. His passion is using CAD design and his homemade CNC router to bring large wood projects to life. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. too far. 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. Here is what I was working on but looks like I need a better design. Attach the ball head to the top board. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). This makes for better sky photographs as the exposure time can be lengthened,. the side of a rigid secondary cage. I had some carboy caps that make good knobs. This is because my router bit was inch and the arc would be cut by the outside edge of the bit (where the circle had been cut by the inside edge.) off the bearings. I had nearly completed the base and put things together for the first time. The extra force will also 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. The Crayford Focuser and DIY Focuser for Homemade Telescope By trukmeeilee in Circuits Cameras 3,461 3 1 Download Favorite By trukmeeilee Follow More by the author: The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. They have many items for ATMers and I had frequently visited their website when planning my scope.
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