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. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. And a flat thing to put it all on The Dob is really a great design. I have several of the books on building a Dobsonian Telescope. Just to make sure I liked the stain, I applied some to a piece of scrap wood. on Introduction. So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. Did you make this project? You currently have javascript disabled. To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. The focuser shaft on the telescope is 13.1mm in diameter. 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. A homemade 16 inch dob lightweight telescope, DS-4 - XMission I had some carboy caps that make good knobs. small, it's surprisingly rigid. Primary telescope mirror aftermarket, homemade, or custom-made. 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. Put it all together Several clamps were used to hold the pieces together overnight. As the authors describe the benefits of a truss design, it is hard to dispute their arguments. larger diameter. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. I didn't bother reading his whole article to figure out what f/# he used) I am not trying to say that good AP isn't possible with a sonotube scope, (the 'friend' may very well have pulled it out of the dob mount, added rings and a dovetail, and mounted it on his CGE-Pro or comparable) but in this case it is unlikely.". I had considered using a clear finish alone, but decided to use a dark red finish on the base and a clear finish on the tube, just because I like the look. It's easy to shim it to exactly 2" with adhesive labels placed one at a time inside the tube until a 2" eyepiece or 1.25" adapter is snug. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. on Step 1, Richards in our local astronomy club. off the bearings. Please re-enable javascript to access full functionality. Position "0" is with the focuser all the way IN (at least for a refractor). Thicker knitting needles would be even The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. Did you make this project? an eyepiece. I first tried my 32mm plossl eyepiece. The next day my wife called me at work to tell me a box had arrived with telescope stuff. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. 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. 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. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. 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. focuser. 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. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. Tom's Homemade Telescope Page - 14 inch dob - Google How to make diy focuser pvc - YouTube I'm' glad I did, because I didn't like the first color that I had chosen. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. On the cutting diagram, you can see that the side bearings were cut 26 inches long. Carve out a hole on the top part of the sonotube first. Showcasing amazing maker projects of 2022. I had the thought that as long as I was going to build it I should build it as big as I could afford. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. This allowed me to cut perfect identical circles. 11 years ago If you're not familiar with Arduino, watch some tutorial videos. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! I don't have the skills to build a focuser using a. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Perfect for astrophotography or during high power planetary observation. This software creates a model of your telescope by measuring out of focus star sizes at various points. installations. But, especially on cold evenings, the focus may go out in the middle of the night. I wanted the long focal length for good contrast. That is dirt cheap compared to the cost of commercially available focusers, which can top $1000 and are much heavier than what we will build. Like i said these are not my photos and i cannot coment on exactly how he set it up as i was not there all i can say is i saw the mount he used when he picked up the telescope. Once its cut to length, drill a hole through each end of the tubing with a drill press. Install on Windows 10, this part is pretty straightforward. The hole is made slightly larger than the shaft, this is normal. Crayford-style design with four bearings and one driveshaft. Measure the diameter of the exposed shaft. Fast forward a few months to the next time I had the tube outside. Or in my case, back to SolidWorks :-). Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. Look down through the empty focuser. 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. - Bill. A bit of a monster! The sides were attached with wood glue and clamps with a few small brads to hold everything in place. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. This cost around $100 to build and all of the components came from. surfaces to put the bearings in and a vee at the bottom that would hold The day I received the refund, I ordered a mirror cell from University Optics. ASIAIR - Is there an easy way to load Messier catalog into Autorun? With the DRV8825 and Arduino Nano plugged in, the basic board is complete. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. However more than the focuser, I liked your scope. Unfortunately I don't have a 3d printer. To view, go here: http://emediadesigns.com/focuser/ This is where you will use screws to strongly attach the focuser onto the tube. Telescope Magazine. 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. corners of the squares provide nice nooks for the eyepiece and eyepiece Several functions may not work. While round tubing is sturdy, square tubing is easier to work with. The part is very strong! If you want a Crayford focuser with a knob instead of turning the draw tube, then Jerry Oltion's designhttp://www.jerryoltixycrayfords.htm using box frames and knitting needle drive shafts is also a fairly easy build. 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. I found a used 16 primary on eBay. 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. by cranking The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. ill ask him for a detailed list of what he used and when i get that ill post it here for you. It's rigid, lightweight, and You will need to order one sized for your telescope's focuser shaft size. 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. 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 I also have an extended photographic build diary of this telescope posted on Imgur. Here is what I was working on but looks like I need a better design. And a couple of upright bearing blocks. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. I ground and figured the mirror with little troubles, making my focault tester, etc. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. The focuser knob had two set screws. the drive shaft close against the drawtube. Several of my Recent Images have been focused with this system. 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 extra force will also I've been using the above pair When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. 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. I could not find a spacer to fit my 9/16 hole, so I bought the 11/16 spacer (1 1/8 long because that's what the store had) and a bit of the same size. Focusers of telescopes. Types, difference, specifications - Star Hunter Next, attach the eyepiece and the focuser to the top part of the telescope tube. var pageTracker = _gat._getTracker("UA-1008534-4"); One of the neat things about the square design is that the I read the entire thread and surely its going to help me building my focuser. With Simple | Space I carefully cut exactly through the center of each side bearing circle to make my semicircles. guarantee a response, but I'll do my best to answer everyone who writes 10 years ago needle adds no friction that I can feel to the focus action. 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. Telescope Electronic Focuser : 16 Steps (with Pictures) - Instructables my 12.5" trackball, but I didn't 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. Share a cool tool or product with the community. 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. I wanted to wrap the tube in veneer because I had seen a homemade telescope on a website that used veneer and I liked the look. I did not glue the bearings to the tube box in case I needed to adjust the position later. We all know the problems with focusing. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. Since these focusers were going side-by-side on a binocular It has a 6mm shaft. All in all it seemed like a pretty robust design, so I gave it More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? I only do functional. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . How to make a $30 DIY star tracker for astrophotography The drawings are only approximately to scale. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. on Step 5, 9 years ago Start with the small components first. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. The original Crayford Focuser is on display there. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. accessible by all ages and skill ranges. Fairly easy to build and could be adapted to suit any SCT focuser. Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. You should now be able to drill the 4 holes at each corner. eyepiece on the ground (or worse, on your primary mirror!) Thanks for the great comment. Homage to Homemade Crayford Focusers - Cloudy Nights After the second call, I received a response that it would be ready at the end of the following week. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. The pivot bolt consists of a 1 1/8 inch brass spacer with an 11/16 inch outer diameter, a 3/8 inch bolt 2 inches long, a stop nut, and two large washers. I want to make this direct drive system work. 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. Topics such as 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. 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. 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. A Beginner's Guide to Collimation - Gary Seronik you could probably space the bearings 3/4" apart instead of 1" and mount The email bounced back to me. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. (actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. In my case I decided to make a custom bracket. The cost is a bit more than some of the other combinations, but by only $10 or $20. too far. Here is a link to the main FILES area on Robert Brown's site. Make the drawtube longer than you think you'll need, just in I only use the OTA. I really had to, since the underside of my telescope's focuser is all curves, no flat area for attaching the mounting bracket. But let me see what items I can arrange to make a helical. Home centers and hardware stores did not carry large sizes. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. 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. on Introduction, Very nice build nikon20. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. 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. Share it with us! Cost is $25 - $30, and you will have 5 PCBs in about a week. They said they would make the brackets extra long to accommodate the mirror and it would take about a week. I redrilled the holes for the mirror cell and got ready to wrap it. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. If you follow the procedures described above, your telescope's optics will be perfectly aligned. 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. Once I had my design set, I was ready to buy the parts. Able to make myself using my own humble tools (or toys as the pros will call them!) 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.
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