This is not recommended for shared computers. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. 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. A Pocket Sundial From a Broken Pocket Watch! I have no idea how much mail this idea will generate, so I can't 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. 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. larger diameter. I read the entire thread and surely its going to help me building my focuser. My homemade motorized telescope focuser for Celestron C8. Let me see if I can get similar plumbing parts here. he might just have a $3200 camera, they aren't very hard to come by. Slewing to find an object and then tracking an object on the sky, so when you make a homemade telescope on the motorisation process you will need high speed for slewing and low speed for tracking or fine movements. I got a different stain, tested it, and went back to work. try { document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Only problem is if I put a diagonal it wants to rotate the helical part. DIY Truss Dob input: How to design truss? Orion Dynamo Mini for powering a Nexstar 6SE? 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. Carve out a hole on the top part of the sonotube first. My secondary is 4; for tips on choosing size, click here. ScopeStuff is awesome!! A bit of a monster! To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. I have several of the books on building a Dobsonian Telescope. Motion is very smooth. The mount and tripod are pretty much useless for astrophotography. On the bottom of the Bottom board is a ring of Ebony Star laminate that glides over the three teflon pads located directly above the feet on the ground board. Position "0" is with the focuser all the way IN (at least for a refractor). This was to allow the circle cutting jig to be attached to the board to cut the arcs from a center point of 25 inches above the ground. Shorter thread side will be used to attach the eyepiece. It's rigid, lightweight, and I had the thought that as long as I was going to build it I should build it as big as I could afford. Plus it comes in black, so 10 inch or 12 inch. That helps with low-profile 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. As the authors describe the benefits of a truss design, it is hard to dispute their arguments. homemade Crayford focuser. Once you get it working, there's some calibration you need to do. Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. 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.) On the cutting diagram, you can see that the side bearings were cut 26 inches long. Well, it sort of looks like a focuser.. See pictures below. 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 If not, you may need to design and print your own bracket(s), gears, and so on. 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. 7 years ago Robert is a super guy and more than willing to help those who choose to follow in his footsteps. (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.) was straight so I wouldn't get a wobbly knob. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. 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. Thanks Peter. Here is what I was working on but looks like I need a better design. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. 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 started by trying to drill out a metal gear for the focuser shaft. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. Our websites use cookies to improve your browsing experience. It's easy to shim it to needle so the knitting needle will be snug against the drawtube without Thanks Pinbout for sharing your design. I would love to see your build when you are finished with it . The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. you don't need to paint it (or worry about paint flaking off it). Download and check them out, I just grabbed the first one and printed it. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. the bearings right at the edge of the frame, reducing the frame to But, like many of you I'm sure, the biggest reason I'm doing this is for the pure geeky fun of it! It doesn't. A tilted focuser will have no effect on the image quality. 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. Electronics and software automate the process of taking pictures. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. 11 years ago 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). 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. It turned out that they had an incorrect zip code and the package was still waiting to be sent. If you're not familiar with Arduino, watch some tutorial videos. Funny how the bigger they are the better for dobs. Cost is $25 - $30, and you will have 5 PCBs in about a week. This is the kind of simple off the shelf design I was looking for. If you look in the FILES area on Robert Brown's site (see link above) you will see a sub-folder "3D Printed Parts". It stalled when tension on the belt increased. I do have another tube that can be used around the drawtube, but it doesn't really add anything. and an eyepiece. This unit takes signals from your computer and drives the stepper motor on the focuser. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. Topics such as I installed the spider first, about one inch down from the end of the square end of the tube. (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.) case you need more focuser travel than you thought. The next day my wife called me at work to tell me a box had arrived with telescope stuff. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. As the telescope tilts toward the horizon, the mirror must be supported on its edge. adapter set screws to slide into. Easy DIY motorized battery free telescope focuser - YouTube 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. How to make diy focuser pvc - YouTube Next, attach the eyepiece and the focuser to the top part of the telescope tube. but try for a snug fit if you can. I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. 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. 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. I tried this one first and found it wouldn't work for my application. Obviously an open truss telescope. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. You will have to line up the diagonal and primary so that you see a centered image of the sonotube opening and the spyder in the eyepiece hole. A 6 in primary mirror does not have enough weight to make the dob stable. 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. 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. A If you wanted to really go low-profile with this design, Measure the diameter of the exposed shaft. Bill, Impressive work and great idea about LSDF focuser. The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. It's the same in form, but has a perfect, true 13.35mm hole. haven't yet found any design elements that need improvement. You won't need to write any sketches from scratch, but you will at least need to figure out how to upload them to the Nano. The flat wants to be running parallel to the long axis of the tube. I don't have the skills to build a focuser using a. NEMA-17 Stepper Motor - see below, there are two options. There was the expense, for one, but also the This design could be adapted to practically any telescope or focuser, so I've kept my outline on the project brief. 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. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. Keeping with the 'simple ' part of your request, here is a helical 2"/1.25" focuser made from std plumbing parts. I had installed the mirror about an inch too far away from the focuser. At this point, the scope was pretty much finished. Although they don't usually sell these parts, because I had ordered the mirrors from them they offered to sell me the spider and secondary holder that they use in their scopes. Edited by sunrag, 28 May 2020 - 10:44 PM. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. After the second call, I received a response that it would be ready at the end of the following week.
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