This motor has a 5mm drive shaft. If you're not familiar with Arduino, watch some tutorial videos. The specific hardware used for this is described on the Building page. I don't have the skills to build a focuser using a. To glue the side bearings and rocker sides to full thickness, I covered a side with wood glue, then carefully lined up the pieces and put two small nails into the pieces to hold them in place. I described it two years ago in this thread:https://www.cloudyniuser/?p=8879835 . exactly 2" with adhesive labels placed one at a time inside the tube So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. 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. 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. I hate focusing. This means I can use FocusMax to do the focusing. I started by trying to drill out a metal gear for the focuser shaft. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. Knitting needles are 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. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. It's easy to shim it to Just as it was about to come into focus, the focuser bottomed out. I have several of the books on building a Dobsonian Telescope. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. My homemade motorized telescope focuser for Celestron C8. The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. I had considered a Moonlite or Featherlite focuser, but I knew from my experience with my 6 inch scope that I wanted a 2 speed focuser, and the price tag of their 2 speed focusers scared me away. You will need to order one sized for your telescope's focuser shaft size. Share a cool tool or product with the community. Download the Gerber Files. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. 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 (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: $1700 Feel free to take on that part if you like, but you're on your own :-). I had to take apart the focuser in order to get my bolts in place. 24 T-nuts, with matching 2 bolts and knobs, 8 Aluminum tubing, thin wall, 1 square, 4 lengths I got mine from Cycle 24, Black woven velveteen, 68 Cut it so it stretches along the 6 axis. My telescope is the Orion ED80T-CF. While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct. Orion Dynamo Mini for powering a Nexstar 6SE? To get this arc, I actually moved the radius of the jig in by 1/8 inch. I carefully cut exactly through the center of each side bearing circle to make my semicircles. I only use the OTA. guarantee a response, but I'll do my best to answer everyone who writes until a 2" eyepiece or 1.25" adapter is snug. initiatives for the next generation of makers. 11 years ago I got no response to phone calls or emails after another week, and decided to wait until the primary would be finished in another two weeks. When you figure out scope, I only put knobs on the outsides. This resulted in a gear that wasn't true and "wobbled" a bit. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. My concern turned to alarm when my wife told me that Discovery had charged the balance due on all items to my account a few weeks earlier. #@$%^#@!!!!! Overall, I'm very happy with the outcome of this project - focusing is now a joy. Make the drawtube longer than you think you'll need, just in on Step 5. 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.". My secondary is 4; for tips on choosing size, click here. You really need a step ladder even for my 10" when pointed overhead. Very simple and portable. The email bounced back to me. I'm only hoping to supplement it a bit with some info and pictures aimed at those with limited skills (such as myself) :-) I'm not an electrical engineer, I'm more of a software guy with some limited knowledge of electronics and basic soldering and assembly skills. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. The focuser is very smooth. There are some test sketches in the "Tests" folder, start with those. At this point, the scope was pretty much finished. It has reminded me of one of my long term aims to make a telescope that has been buried by the demands of the rest of my life! You should watch (and bookmark) this video. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. They're fairly astronowanabe, Pierre Lemay, LarsMalmgren and. Some of these are essential for the basic functionalities of our websites. It seems to can't click on it or copy and paste it; it's a graphic file to thwart You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. forces the knitting needle against the drawtube and the drawtube against Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. Homemade astronomy. 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 Over how many nights did this photography session take place? After the second call, I received a response that it would be ready at the end of the following week. he might just have a $3200 camera, they aren't very hard to come by. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. 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. Perfect for astrophotography or during high power planetary observation. It has a 6mm shaft. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. 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. Two of the holes for the bolts were blocked by knobs. This is my copy of the telescope that Sir Isaac Newton presented to the Royal Society of London in 1671, and is considered to be the first successful reflecting telescope. The bigger upvc nut will be attached to focuser plate and longer threaded side will be used on it for the focusing. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. accessible by all ages and skill ranges. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). The wood would cost the same, as would pretty much everything except the mirror, so why not spend a little more on the mirror and go BIG. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. Rock 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. 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. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. Did you make this project? I phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. I had cut the 12 foot tube in half in order to get it home in the first place, and a 6 foot section was the right size to work with for my f/5 12.5 inch. weight. 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. Well, it sort of looks like a focuser.. See pictures below. Fairly easy to build and could be adapted to suit any SCT focuser. 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 addition, we use third-party cookies to help us analyze and understand usage. installations. This proved fatal for the stepper motor! I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. 11 years ago I have no idea how much mail this idea will generate, so I can't It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. The basic points I wanted to cover: What did I end up with? 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. Edited by howardcano, 24 May 2020 - 09:29 PM. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! It would cost less and they have a very good reputation. A wide hole will let the knitting needle creep PVC pipe makes great drawtubes. 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. tube and nut that fits the outside threads. I waited until dark and pointed the scope at the sky. Finally, attach your polar alignment device and align it with the hinge. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. on my binocular scope for quite a while now and really like them. 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.) Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. But, like many of you I'm sure, the biggest reason I'm doing this is for the pure geeky fun of it! This scope was originally made as a travel scope using an eight inch mirror that I ground and polished at the St Pete Astronomy Clubs Mirror Lab. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. 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. 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. In amateur astrophotography, we run our telescopes overnight. 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. I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. All in all it seemed like a pretty robust design, so I gave it That way you won't be dropping your drawtube and I wanted a tight / press fit, so I only added half that, 0.25mm. 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. Find a special something for the makers in your life. 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting 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. In my case I decided to make a custom bracket. My guess is that photo was taken with a refractor. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); The sides were attached with wood glue and clamps with a few small brads to hold everything in place. 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). think that design would be rigid enough under the weight of a diagonal I had some carboy caps that make good knobs. I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. Most of these have one or two set screws. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. The scope including the optics, truss tubes, and eye pieces all stored in a single box making it easy to store and transport by car, but it was a little too big to fit in the overhead compartment or under the seat on most aircraft. small, it's surprisingly rigid. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. I have seen some VERY impressive photos similar to those, taken with Nikon D700 and D300 cameras, with the proper filters- and mounts- on a quality scope. His project is very well documented. Gift the gift of Make: Magazine this holiday season! As I mentioned on my binocular } 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. love to hear from people who are interested in this focuser design. stronger, but would give me a coarser focus action because of their Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. Nice one. you don't need to paint it (or worry about paint flaking off it). PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. 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. Not worth the effort, price is tooo high. Start with the small components first. ASIAIR - Is there an easy way to load Messier catalog into Autorun? an eyepiece. 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. Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. The focuser shaft on the telescope is 13.1mm in diameter. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . Plus it comes in black, so Here is a link to the main FILES area on Robert Brown's site. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. Im quite happy with the result, and the view in its large mirror is phenomenal. I used one of the top scraps from the rocker sides to mark an angle of 70 degrees from the center of the arc to the curved cut in order to properly space 1 X 7/8 teflon pads on the arcs. flexing. I am using scrap upvc pipe material. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. eyepiece on the ground (or worse, on your primary mirror!) 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. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . 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. 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. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. It interfaces to the computer via USB and comes with an ASCOM driver. This motor is available on Amazon. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. my thoughts naturally gravitated toward a boxy focuser to go with it. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. 11 years ago I brought a saw with me so that I cut it in half to fit in my minivan. 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. 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. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. 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. Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. how much travel you actually need, you can cut the tube off so none of This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. 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.
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