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. eyepiece on the ground (or worse, on your primary mirror!) I made this Crayford style focuser using plywood scraps and surplus bearings. 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. Showcasing amazing maker projects of 2022. Two such companies would not give me a price because the order of a single tube was too small. Robert Brown did an excellent video on how to work out your stepper motor requirements. ScopeStuff is awesome!! The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). A Pocket Sundial From a Broken Pocket Watch! Fire up focusmax, and shoot some images! This motor has a larger shaft diameter (8mm) and is quite a bit heavier overall than the direct drive motor, mainly because of the gearbox. the bearings, totally eliminating any flex. If you're going for simple, have you considered a helical focuser? With the DRV8825 and Arduino Nano plugged in, the basic board is complete. Gift the gift of Make: Magazine this holiday season! 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. The motor is much lighter than the geared motor. Once I had my design set, I was ready to buy the parts. For my project I needed a 14 inch diameter, and I had a tough time finding one. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. Primary telescope mirror aftermarket, homemade, or custom-made. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it. I described it two years ago in this thread:https://www.cloudyniuser/?p=8879835 . 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. Overall, I'm very happy with the outcome of this project - focusing is now a joy. Thanks Peter. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. an inch or so apart, so the focuser body could be pretty low profile. The kit just contains the electronics - it is up to the user to find a stepper motor and attach it to their own telescope focuser. The box should be deep enough to allow the mirror box to swing all the way down. 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. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! 5 weeks after I had ordered the mirror, I called to ask about its status. This makes for better sky photographs as the exposure time can be lengthened,. 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. A week later the cell arrived (on schedule) from University Optics. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. 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. 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. Your astrophotographer friend may have included his own images from his setup. Next, attach the eyepiece and the focuser to the top part of the telescope tube. a 3/4" thickness. 11 years ago widening the hole. Telescope Magazine. It was easy enough to drill a hole and tap threads for a The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. Build a Backyard Dobsonian Telescope - Make: DIY Projects and Ideas for I tried this one first and found it wouldn't work for my application. This consists of a small black box of electronics. This resulted in a gear that wasn't true and "wobbled" a bit. I've been using the above pair In addition, we use third-party cookies to help us analyze and understand usage. knob, and a drill press to make sure the hole for the knitting needle I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. Homemade astronomy. It's easy to shim it to I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. Bill, Impressive work and great idea about LSDF focuser. I told them I was on my way. Share it with us! And the legs of the base should be as wide as possible to accommodate weight imbalance as the telescope is moved around, to avoid tipping. Given that you can make the drawtube any length you 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. you don't need to paint it (or worry about paint flaking off it). 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. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement. The original Crayford Focuser is on display there. It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. Use mild soap and distilled . Tom's Homemade Telescope Page - Issac Newton Scope - Google Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, 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. This is the upper tube that contains the flat secondary mirror, Telrad finder, and focuser. Please re-enable javascript to access full functionality. 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. (A badly tilted focuser may subtly alter the illumination pattern of the focal plane to a degree that would be impossible to perceive visually but that's about it.) More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? #2 knitting needle would be just about right. For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of The Dobsonian Telescope by David Kriege and Richard Berry. Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). Another vote for Pierre's helical Crayford design. I wanted to finish that instructable before the contest ended but was too late :-). I will get good 30-40 mm focusing range. 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. This sure is going to be a project I will work on. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); (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.) Finally, I glued a strip of Ebony Star laminante to the curves edge of each side bearing using contact cement, using a flush edge bit on a router to bring the edge of the laminate even with the edge of the wood after the cement had set. I called in the order and explained that I would be using a mirror two inches thick. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. I welded mine from steel square tubing. 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. After researching several possible sources for a primary mirror, I decided to order an f/5 12.5 inch mirror from Discovery Optics. It turned out that they had an incorrect zip code and the package was still waiting to be sent. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. It doesn't. A tilted focuser will have no effect on the image quality. Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, Soft-sensor-saurus | an E-textile Soft Sensor Soft Toy With LED Light. Deep space photos like these require HOURS of exposure for each one. Then it was time to stain and finish. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. a "rubbery" feel. 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. Easy DIY motorized battery free telescope focuser - YouTube Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts. This software creates a model of your telescope by measuring out of focus star sizes at various points. We use cookies to continuously improve our websites for you and optimize its design and customization. knitting needle where it goes through the hole, so it's not a big deal, I have several of the books on building a Dobsonian Telescope. Well, it sort of looks like a focuser.. See pictures below. Orion Telescope Focusers | Buy Direct and Save! It just One 6in dob I made was a complete failure. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! This unit takes signals from your computer and drives the stepper motor on the focuser. 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. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. Able to shift heavy loads of kit ie over 1000g. Thanks for the great comment. 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. Most people will want a knob on I read the entire thread and surely its going to help me building my focuser. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. 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. how much travel you actually need, you can cut the tube off so none of To view, go here: http://emediadesigns.com/focuser/ pageTracker._trackPageview(); PVC pipe makes great drawtubes. 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.) It by cranking The flat wants to be running parallel to the long axis of the tube. Did you make this project? 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. The email bounced back to me. This is where you will use screws to strongly attach the focuser onto the tube. Topics such as I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. On that noteWARNING:do not look directly into the sun and never point a telescope into the sun without proper filtration you can damage your telescope and burn your retinas and possibly go blind i am not a astrophotographer so i cant comment on the quality of the pictures since there is so much doubt on the photos i will gladly take them down. 11 years ago 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. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. 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. This motor is available on Amazon. Two inch internal diameter drawtube. together tech enthusiasts, crafters, educators across the globe. Slide the eyepiece into the focuser and try it out. 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. Make the drawtube longer than you think you'll need, just in 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. Part numbers 351-4574 and 336-422. Upload that main sketch to the Nano. Today I purchased what is called atank nipple in India. Or in my case, back to SolidWorks :-). You should watch (and bookmark) this video. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). 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. To cut the circles, I started with a depth of about 1/8 inch, then lowered the bit and cut a little more with each pass until I was through the board. 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. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. A Pocket Sundial From a Broken Pocket Watch! I installed the spider first, about one inch down from the end of the square end of the tube. A wide hole will let the knitting needle creep And, once your telescope is finished, be sure to join a local astronomy club to learn more about the sky and share your hobby with others. needle to be just a little too flexible for the weight of a diagonal and Make an account on JLCPCB.com, upload the Gerber zip file, that's it! Able to make myself using my own humble tools (or toys as the pros will call them!) he might just have a $3200 camera, they aren't very hard to come by. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. I call shenanigans on every picture in this post except for the the moon. It was May 12th. I then attached the Ebony Star ring using contact cement. I'm' glad I did, because I didn't like the first color that I had chosen. 4 years ago A couple setscrews and you're up & running with an off the shelf solution. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points.
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