Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. This combination has proved to be effective for all positions except when the tube is pointed directly up. knitting needle where it goes through the hole, so it's not a big deal, help eliminate slippage when the focuser is pointed straight upward. 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. Today I purchased what is called atank nipple in India. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". Topics such as A Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. Once I decided to build a scope myself I had to decide on the aperture of the scope. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. I don't *do* pretty. I am well versed in technology, have all the tools necessary to build my own! astronowanabe, Pierre Lemay, LarsMalmgren and. After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. 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 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 Make the hole diameter fairly snug, too. 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 have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. The little app is simple and works great. i got a email that someone built a telescope close to mine that has seen the stuff in the photos here is a link to his site http://www.synapticsystems.com/sky/scopes/Dob.htmlif i seem a bit rude please forgive me i just spent 12hrs in a plane i have jetlag and im sitting in a airport.i would like to thank lvlasertech for keeping this instructable lively and informative. I only use the OTA. was straight so I wouldn't get a wobbly knob. The current needs to be adjusted on the DRV8825. I hate focusing. PVC pipe makes great drawtubes. on Step 3. Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. 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. 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. focuser. I ended up modifying it a bit after printing. You currently have javascript disabled. Or rather, I hated it. If you're not familiar with Arduino, watch some tutorial videos. It's easy to shim it to Able to shift heavy loads of kit ie over 1000g. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. Finally it was etched in caustic soda, and anodised matt black. accessible by all ages and skill ranges. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); until a 2" eyepiece or 1.25" adapter is snug. Slide the eyepiece into the focuser and try it out. I read the entire thread and surely its going to help me building my focuser. The bearings only need to be on Introduction, Very nice build nikon20. It was easy enough to drill a hole and tap threads for a The version number "312" here may change if Robert posts new firmware. I did not wrap the tube until I had completed the base. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. You really need a step ladder even for my 10" when pointed overhead. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. I started by trying to drill out a metal gear for the focuser shaft. I first tried my 32mm plossl eyepiece. Start with the small components first. And a flat thing to put it all on 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. You can see that my Moonlite focuser was slightly larger than the sides of the tube. Interfaced with a computer, so the computer can make the decisions about where the best focus is. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. } 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. corners of the squares provide nice nooks for the eyepiece and eyepiece You should watch (and bookmark) this video. I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. A 10 inch scope would not be very much longer or heavier than my 6 inch, yet it would allow me to see much more. I have several of the books on building a Dobsonian Telescope. Two inch internal diameter drawtube. Edited by sunrag, 28 May 2020 - 10:44 PM. 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. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. I drew a guide line straight down the side of the tube and cut the veneer to length with one extra inch on each side68 inches long. 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. It has a 6mm shaft. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. This is the first telescope that I have built. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. I redrilled the holes for the mirror cell and got ready to wrap it. It's the same in form, but has a perfect, true 13.35mm hole. Have you made any mods on it since you built it? Some quick tips to note if you are making a homemade telescope are: 1. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . In amateur astrophotography, we run our telescopes overnight. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. It is size 1.25 inch with a clear inside dia-meter. The specific hardware used for this is described on the Building page. In my case I decided to make a custom bracket. I decided to keep this tube for now and if I run into problems with it, I can replace it later. surfaces to put the bearings in and a vee at the bottom that would hold 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. Perfect for astrophotography or during high power planetary observation. Link to the motor speed controller kit:http://www.jaycar.com.au/productView.asp?ID=KC5225(a 5K external potentiometer will be required): http://www.jaycar.com.au/productView.asp?ID=RP3508The drive motor:http://www.jaycar.com.au/productView.asp?ID=YG2734The gears:http://www.jaycar.com.au/productView.asp?ID=YG2736The motor forward/reverse switch:http://www.jaycar.com.au/productView.asp?ID=ST0506The push button:http://www.jaycar.com.au/productView.asp?ID=SP0711 I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. The day I received the refund, I ordered a mirror cell from University Optics. 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. So I was looking for a cheap, light-but-sturdy design for a I'd My plan for wrapping the tube seemed good, but I am not too pleased with the final result. Very simple and portable. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. It was May 12th. Drill the holes for the knitting Not worth the effort, price is tooo high. Bill, Impressive work and great idea about LSDF focuser. This cost around $100 to build and all of the components came from. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). Funny how the bigger they are the better for dobs. They have many items for ATMers and I had frequently visited their website when planning my scope. he might just have a $3200 camera, they aren't very hard to come by. 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 week after they said they would send the secondary and other parts, I called to ask if things had been sent. Page 1 of 2 - DIY focuser design - posted in ATM, Optics and DIY Forum: Hi I am working on a diy focuser design for my 6 F/8 telescope and asking suggestions for simple focuser. Fast forward a few months to the next time I had the tube outside. This means you lose much of the night's images. on Introduction. Gift the gift of Make: Magazine this holiday season! 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. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . If not, you may need to design and print your own bracket(s), gears, and so on. New Creation Tamil 6.96K subscribers Welcome to New Creation Tamil Our Channel include of Guiding Videos: 1.DIY Projects 2.Awesome Ideas 3.Tips You are inter with New Creation Tamil you can enjoy. I would love to see your build when you are finished with it . I'm also going to focus on only one version of Robert's focuser (there are many). The telescopes size is classified by the size of its mirror. After waiting for the stain to dry for a day, I applied polyurethane in two coats, going over the surface with 0000 steel wool between coats. While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. Install on Windows 10, this part is pretty straightforward. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). Thanks Pinbout for sharing your design. As the thread shows you could also build the dual speed version, all made of plywood, if you feel ready to tackle a slightly more complex project for a cost of about 5$ more. 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. I called in the order and explained that I would be using a mirror two inches thick. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. Position "0" is with the focuser all the way IN (at least for a refractor). My homemade motorized telescope focuser for Celestron C8. Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. I applied contact cement to the first inch of the veneer and the mating inch of the tube. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Secondary mirror with spider holder Search on eBay for a matched set. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. 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. 11 years ago 11 years ago I my thoughts naturally gravitated toward a boxy focuser to go with it. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. Able to make myself using my own humble tools (or toys as the pros will call them!) I installed the spider first, about one inch down from the end of the square end of the tube. 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. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. This resulted in a gear that wasn't true and "wobbled" a bit. and an eyepiece. . The rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more weight. We are now ready for some testing. This arrangement turns 100% true, no wobble. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. 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. control. 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 try. Step 4Attaching the Side Bearings and assembling the Rocker. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. 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. Finally, attach your polar alignment device and align it with the hinge. 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. The plate has slotted screw holes for tensioning the 6mm belt. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. I marked the spot and moved things back inside to install the mirror. From everything I had read, I expected that getting a sonotube would be as easy as running to any hardware store and picking it up. As I mentioned on my binocular CNC files (optional) Download the Sketchup files. The Focuser and other items: (Scope Stuff). After another 3 weeks, I was concerned that I had not received the mirror. DO NOT drill out the holes in the board! The original Crayford Focuser is on display there. Download and unzip. 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.". In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. my 12.5" trackball, but I didn't on my binocular scope for quite a while now and really like them. i am not trying to win this contest with photos. Not sure if it is available in the USA. how much travel you actually need, you can cut the tube off so none of : "http://www. On the cutting diagram, you can see that the side bearings were cut 26 inches long. Plus it comes in black, so 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. This will determine the size of the coupler you will use to connect the stepper motor. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. My telescope is the Orion ED80T-CF. All i did was supply the telescope as far as his camera equipment i dont know what he used i never saw it all i know is he had my scope for about a month while i was traveling and he gave me these photos. 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. This project is based on Robert Brown's "Arduino ASCOM Focuser Pro2 DIY". Most people will want a knob on 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. The focuser is very smooth. 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. Or in my case, back to SolidWorks :-). work really well, for a fraction of the cost of a commercial Crayford Your design is simple and nice. I wanted a tight / press fit, so I only added half that, 0.25mm. I had chosen a boxy, rigid design for the binocular scope, so I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. At this point, the scope was pretty much finished. 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. How to build a 12.5 inch closed tube Dobsonian telescope. Showcasing amazing maker projects of 2022. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. 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. 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. Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. Some of the very best planetary and deep sky pics I have seen have come from a Fuji S3 professioanl camera [based on a Nikon body] and a Canon 20Da, which was designed with [I think] a user replaceable inside the mirror box filter for astral photography. DIY Craford Focuser. To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. Now attach the screw eyes and the rubber band on the side of the board. I carefully cut exactly through the center of each side bearing circle to make my semicircles. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. I'm' glad I did, because I didn't like the first color that I had chosen. 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. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. 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. If you go to buy all of the components for this project from dealers, you will see that you mostly have to buy at least 5 parts, sometimes bags of 50 parts! The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. This can be shimmed out with paper wrapped around the After waiting for the contact cement to dry to the touch, and with my wife's help, I carefully aligned the edge of the veneer with the guideline on the tube and pressed the first inch together. A bit of a monster! 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. The glue should keep the nylon from fraying. Two of the holes for the bolts were blocked by knobs. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. That way you won't be dropping your drawtube and 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. initiatives for the next generation of makers. NEMA-17 Stepper Motor - see below, there are two options. narrow the frame. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. 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. I made this Crayford style focuser using plywood scraps and surplus bearings. There are some test sketches in the "Tests" folder, start with those. Membership connects and supports the people and projects that shape our future and supports the learning After the second call, I received a response that it would be ready at the end of the following week. Overall, I'm very happy with the outcome of this project - focusing is now a joy. The drawings are only approximately to scale. needle to be just a little too flexible for the weight of a diagonal and
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