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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. If you're not familiar with Arduino, watch some tutorial videos. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. After the glue dried but before the clamps were removed, I added corner braces to all four corners of the tube using glue and brads to hold them in place. 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. They have many items for ATMers and I had frequently visited their website when planning my scope. It stalled when tension on the belt increased. While round tubing is sturdy, square tubing is easier to work with. Able to shift heavy loads of kit ie over 1000g. Knitting needles are 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. on Introduction. Thicker knitting needles would be even This means I can use FocusMax to do the focusing. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. The focal length of the mirror is 61 inches. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, you could probably space the bearings 3/4" apart instead of 1" and mount Be creative! 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. Another vote for Pierre's helical Crayford design. Primary telescope mirror aftermarket, homemade, or custom-made. 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. 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. Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. To view, go here: http://emediadesigns.com/focuser/ Bill, Impressive work and great idea about LSDF focuser. This is the first telescope that I have built. eyepiece on the ground (or worse, on your primary mirror!) Share it with us! Feel free to take on that part if you like, but you're on your own :-). So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. 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. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. My guess is that photo was taken with a refractor. Featured in the February, 2015 issue of Sky & think that design would be rigid enough under the weight of a diagonal 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. I used one of these scrap pieces to draw an angle of 70 degrees to the edge of the arc so that I could later place the teflon pads on the arcs. I had some carboy caps that make good knobs. forward and back along with the drawtube when you focus, and you'll get wobbly knob still works, and adds character. DIY Craford Focuser. Save over 40% off the annual cover price for a full year (4 issues) of Make. DIY Truss Dob input: How to design truss? Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. I then attached the Ebony Star ring using contact cement. 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. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Maker-written books designed to inform and delight! We all know the problems with focusing. After going over the surfaces with a tack cloth to pick up the saw dust, I applied the stain and went over it with cheese cloth rags for an even finish. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. help eliminate slippage when the focuser is pointed straight upward. Overall, I'm very happy with the outcome of this project - focusing is now a joy. I don't have the skills to build a focuser using a. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. 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. The email bounced back to me. 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. larger diameter. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. But who cares, really? Remember: It is the quality and SIZE of the capture chip, NOT the megapixels that determines quality. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. I decided to use baltic birch because it is recommended by Kriege and Berry as well as many online sources. I brought a saw with me so that I cut it in half to fit in my minivan. an inch or so apart, so the focuser body could be pretty low profile. telescope page, I wasn't really eager to buy two commercial Crayford With the DRV8825 and Arduino Nano plugged in, the basic board is complete. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . Helical is one of the option i am considering. 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. 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. 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. pageTracker._trackPageview(); As I read the book I decided that I should build a 12.5 inch truss tube scope. 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 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. CNC files (optional) Download the Sketchup files. 11 years ago 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. The cell from Anttler's, for which I had received a refund, had arrived. This arrangement turns 100% true, no wobble. Orion Dynamo Mini for powering a Nexstar 6SE? Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. Thanks for your article. the nylon screws going up from the bottom, but I found the knitting This cost around $100 to build and all of the components came from Jaycar, except the brackets which were made with 1.2mm sheet metal. Obviously an open truss telescope. A few months later I ordered some other things from Scopestuff, including strips of Ebony Star laminate for the side bearings, a ring of Ebony Star for the rocker bottom, a strip of teflon to cut pieces for the ground board and side bearings, and a new base for my Telrad finder. Pierre Lemay, thanks for sharing your simple and incredible design. I do it with aluminium alloy, aluminium tube and nice work. When you figure out I did not own all of the tools that I needed for this project, particularly a table saw and router, so I did a lot of work while visiting my Dad. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. corners of the squares provide nice nooks for the eyepiece and eyepiece he might just have a $3200 camera, they aren't very hard to come by. astronowanabe, Pierre Lemay, LarsMalmgren and. This proved fatal for the stepper motor! This book describes in great detail the steps to build a large aperture truss tube dob, focusing on scopes with a 12.5 to 40 inch mirror. curated by us, the people behind Make: and the Maker Faire. (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.) I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. Im sorry to hear you couldn't make the contest. 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. Once its cut to length, drill a hole through each end of the tubing with a drill press. There are some test sketches in the "Tests" folder, start with those. Gift the gift of Make: Magazine this holiday season! Several of my Recent Images have been focused with this system. Since these focusers were going side-by-side on a binocular If you look in the FILES area on Robert Brown's site (see link above) you will see a sub-folder "3D Printed Parts". I want to make this direct drive system work. Start with the small components first. Topics such as Fairly easy to build and could be adapted to suit any SCT focuser. Their step by step instructions were invaluable to me as I built this scope. In amateur astrophotography, we run our telescopes overnight. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! I called in the order and explained that I would be using a mirror two inches thick. This is the upper tube that contains the flat secondary mirror, Telrad finder, and focuser. A Pocket Sundial From a Broken Pocket Watch! Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. Able to make myself using my own humble tools (or toys as the pros will call them!) Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. 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. 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. Find a special something for the makers in your life. If not, you may need to design and print your own bracket(s), gears, and so on. Just drill holes in both ends and mount the lenses. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. 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. I didn't receive any confirmation email after a few days, so I tried to send them an email. Telescope Magazine. 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! Trim off any unused fabric along the base. Un-real!!! But let me see what items I can arrange to make a helical. 5 weeks after I had ordered the mirror, I called to ask about its status. The mirror cell: University Optics (eventually). After researching several possible sources for a primary mirror, I decided to order an f/5 12.5 inch mirror from Discovery Optics. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. Crayford focusers are considered superior to entry-level rack and pinion Not sure if it is available in the USA. It has a 6mm shaft. A 6 in primary mirror does not have enough weight to make the dob stable. drneilmb, thanks for sharing the focuser design. When you want to focus, you just open the program and press focus. In addition, we use third-party cookies to help us analyze and understand usage. Not worth the effort, price is tooo high. Very simple and portable. Rock on! A week later the cell arrived (on schedule) from University Optics. 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. Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. 11 years ago Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! accessible by all ages and skill ranges. I don't *do* pretty. Here is a link to the main FILES area on Robert Brown's site. the bearings right at the edge of the frame, reducing the frame to . Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. I don't have the skills to build a focuser using a. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). Not sure how your toilets are built over there, but here they use what is called a tank flush valve. I will post the pic of final focuser once ready. This sure is going to be a project I will work on. I wanted a tight / press fit, so I only added half that, 0.25mm. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. This combination has proved to be effective for all positions except when the tube is pointed directly up. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. You can view and download the full file here. weight. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. The wide square footprint would make it pretty stable when mounted to Nice work and great instructable! 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 will get good 30-40 mm focusing range. 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. The lumber yard also gave me a lower price than I expected. the interior diameter is just a nudge over 2". If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. 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. It may need some careful coaxing with a screwdriver. Have you made any mods on it since you built it? on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. my thoughts naturally gravitated toward a boxy focuser to go with it. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. 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. They're fairly Participated in the Celestron Space Challenge. The specific hardware used for this is described on the Building page. 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. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. 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. 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. 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. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. a try. The next day, I centered the rocker on the rocker bottom (which had been cut using the same method as the side bearing circles), drawing perpendicular lines through the center of the rocker bottom to use as a guide, and tracing the position on the rocker bottom. I wanted the long focal length for good contrast. a 3/4" thickness. The version number "312" here may change if Robert posts new firmware. My homemade motorized telescope focuser for Celestron C8. I applied contact cement to the first inch of the veneer and the mating inch of the tube. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. - Bill. rod for the drive axle it would have a fairly fine motion. Crayford-style design with four bearings and one driveshaft. Funny how the bigger they are the better for dobs. 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. Download and unzip. To get this arc, I actually moved the radius of the jig in by 1/8 inch. I started with a spacer that with a inch outer diameter. on Step 1, Richards in our local astronomy club. The cutting diagram in (figure 1) shows how I cut the required pieces from two 60 X 60 pieces of Baltic Birch plywood, one inch thick, and one 5/8. Share a cool tool or product with the community. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. Two inch internal diameter drawtube. Measure the diameter of the exposed shaft. The extra force will also "https://ssl." To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. really stiff and light for their size, and even though a #2 is pretty The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. 4 years ago tube and nut that fits the outside threads. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. 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. 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. Just as it was about to come into focus, the focuser bottomed out. I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. small, it's surprisingly rigid. 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. After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. This resulted in a gear that wasn't true and "wobbled" a bit. That's pretty much the focuser. In my case I decided to make a custom bracket. Most people will want a knob on Connect the Arduino USB cable and upload some test sketches. you don't need to paint it (or worry about paint flaking off it). surfaces to put the bearings in and a vee at the bottom that would hold Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . The belt and pulleys are off-the-shelf items available on Amazon. 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. Until I see photos of this scope setup for these pictures and an explanation of the exact equipment used, I cannot believe that these pictures were taken with this OTA. A Pocket Sundial From a Broken Pocket Watch! The box should be deep enough to allow the mirror box to swing all the way down. The hole is made slightly larger than the shaft, this is normal. I Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. As I set of the scope, several club members came over to check things out and it was nice to hear the positive comments on the appearance of the scope. by cranking During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. I Hope to give you ideas if you are thinking about building one for yourself! You will look through these as you rotate the wheel. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. 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 didn't have the primary mirror yet). After a dry fit of the rocker to make sure that the tube box with side bearings would fit well, I glued the rocker sides to the rocker front, holding them in place with small nails and clamping overnight. Able to shift heavy loads of kit ie over 1000g. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . Unfortunately I don't have a 3d printer. together tech enthusiasts, crafters, educators across the globe. This means you lose much of the night's images. I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Two of the holes for the bolts were blocked by knobs. 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. The telescopes size is classified by the size of its mirror. The focuser is the part of the telescope that holds the eyepiece or camera, and by moving in or out, closer or farther from the . 1" Rack & Pinion Focuser. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. 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.

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