If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Low, or Zero slop when changing direction. My first telescope I built was a 10" F8. Bill, Impressive work and great idea about LSDF focuser. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. This software creates a model of your telescope by measuring out of focus star sizes at various points. I bought a 4" PVC Sewer pipe cap, used a hole saw to cut a 2.25" hole then attached the helical thing to the PVC cap. - Bill. a 3/4" thickness. I had chosen a boxy, rigid design for the binocular scope, so Or rather, I hated it. The cell from Anttler's, for which I had received a refund, had arrived. 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. It's the same in form, but has a perfect, true 13.35mm hole. 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. Having an RS trade counter 2 miles away is such a luxury! Community Forum Software by IP.BoardLicensed to: Cloudy Nights. The focuser is very smooth. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . My homemade motorized telescope focuser for Celestron C8. It uses a primary mirror to capture and reflect light, a secondary mirror to direct light into an eyepiece, and a focuser to make fine adjustments for viewing. This is the kind of simple off the shelf design I was looking for. This resulted in a gear that wasn't true and "wobbled" a bit. How to build a 12.5 inch closed tube Dobsonian telescope. Most people will want a knob on Interfaced with a computer, so the computer can make the decisions about where the best focus is. I don't *do* pretty. telescope page, I wasn't really eager to buy two commercial Crayford I first tried my 32mm plossl eyepiece. The mount and tripod are pretty much useless for astrophotography. I have not yet figured out a better way to hold the tube. This makes for better sky photographs as the exposure time can be lengthened,. The original Crayford Focuser is on display there. They suggested a construction supply place on the other side of the city that I had not called yet. drneilmb, thanks for sharing the focuser design. Telescope Electronic Focuser : 16 Steps (with Pictures) - Instructables Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). 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. I called in the order and explained that I would be using a mirror two inches thick. Perfect for visual observations with very heavy mirrors. 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. Building Your Second Homemade Telescope - Part 1 - HubPages We are now ready for some testing. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. 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. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. scope, I only put knobs on the outsides. Your design is simple and nice. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. A week later the cell arrived (on schedule) from University Optics. Once I decided to build a scope myself I had to decide on the aperture of the scope. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Easy DIY motorized battery free telescope focuser - YouTube surfaces to put the bearings in and a vee at the bottom that would hold What materials did you use? on Introduction. Rock on! I redrilled the holes for the mirror cell and got ready to wrap it. 5 weeks after I had ordered the mirror, I called to ask about its status. I made a similar helical focuser with a nice 2 inch thing I found in Classifieds. off the bearings. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. After the second call, I received a response that it would be ready at the end of the following week. I am well versed in technology, have all the tools necessary to build my own! 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. Given that you can make the drawtube any length you Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. Share it with us! For the ATMer I do find that there are an endless number of parts that can be designed and printed for home built telescopes and binoscopes. The belt and pulleys are off-the-shelf items available on Amazon. 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. Some quick tips to note if you are making a homemade telescope are: 1. This will determine the size of the coupler you will use to connect the stepper motor. Yet I was also becoming infected with aperture fever. the interior diameter is just a nudge over 2". I only do functional. guarantee a response, but I'll do my best to answer everyone who writes If you mess up, you can turn the hole into a slot, but avoid 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. Thanks for your article. A bit of a monster! Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. This motor has a 5mm drive shaft. Slide the eyepiece into the focuser and try it out. 5 weeks after I had ordered the mirror, I called to ask about its status. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). Your astrophotographer friend may have included his own images from his setup. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. the drive shaft close against the drawtube. You currently have javascript disabled. These will be stored in your browser only with your consent and you have the option to opt-out. forward and back along with the drawtube when you focus, and you'll get The diameter of the focuser is usually indicated in inches. I suspected that the company was either in trouble or no longer in business. I did not wrap the tube until I had completed the base. However more than the focuser, I liked your scope. Fast forward a few months to the next time I had the tube outside. If you look in the FILES area on Robert Brown's site (see link above) you will see a sub-folder "3D Printed Parts". 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. I ended up modifying it a bit after printing. I call shenanigans on every picture in this post except for the the moon. With Simple, Homemade Telescopes, You Can Explore the Stars (Op-Ed) I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. You will need to remove the regular focus knob on your telescope's focuser. Start with the small components first. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). I told them to take their time and get it right. More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? I will post the pic of final focuser once ready. I have several of the books on building a Dobsonian Telescope. 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. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. There was the expense, for one, but also the Some of these are essential for the basic functionalities of our websites. 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! A By adjusting the bolts, the mirror can be pointed toward the correct spot. This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. I only use the OTA. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. Fire up focusmax, and shoot some images! And bolt to scope As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. Rack & Pinion: For many years the standard focuser was of the rack-and-pinion type - a small pinion gear moved the flat toothed rack that was attached to or built into the moving focusing tube that holds the eyepiece.However, this geared system was far from ideal, with some wobble due to the friction fit between the fixed and moving tubes and backlash due to the gears. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. adapter set screws to slide into. 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. corners of the squares provide nice nooks for the eyepiece and eyepiece 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. 4 years ago Unbelievable! Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. 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. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. The specific hardware used for this is described on the Building page. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. The secondary holder is adjustable, so I could didn't have to get the location perfect. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Orion Telescope Focusers | Buy Direct and Save! Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. together tech enthusiasts, crafters, educators across the globe. I hate focusing. I I paid the 50% deposit and dreamed of DSOs. Download and unzip. Just drill holes in both ends and mount the lenses. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. 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. It was easy enough to drill a hole and tap threads for a knitting needle where it goes through the hole, so it's not a big deal, I ground and figured the mirror with little troubles, making my focault tester, etc. Depending on your telescope, one of the Brackets that Robert has may work for you. In addition, we use third-party cookies to help us analyze and understand usage. 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. Membership connects and supports the people and projects that shape our future and supports the learning Homemade Electric Telescope Focuser - Stargazers Lounge ScopeStuff is awesome!! (Technically, it should have been 62.5 for a 12.5 inch f/5, but when the mirror came it had a note on the back that the focal length was 61 inches.) Carve out a hole on the top part of the sonotube first. on Step 5, 9 years ago 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. Contact cement is permanent, so the only solution would be to replace the tube! The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. I welded mine from steel square tubing. I told them I was on my way. Make the drawtube longer than you think you'll need, just in CNC files (optional) Download the Sketchup files. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. 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. I do it with aluminium alloy, aluminium tube and nice work. 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. The box should be deep enough to allow the mirror box to swing all the way down. I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. Measure the diameter of the exposed shaft. 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. I Hope to give you ideas if you are thinking about building one for yourself! The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). an inch or so apart, so the focuser body could be pretty low profile. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. How To Build A Dobsonian Telescope [Guide 2022] - DopeGuides 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. Un-real!!! Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. They're fairly Use mild soap and distilled . Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. "); Orient this assembly to allow you to view an object on the far horizon. 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. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. 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. and hope it doesn't fall off 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. 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. Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. 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 focuser shaft on the telescope is 13.1mm in diameter. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. See captioned photos 22-25 here:https://www.cloudyniractor-focuser/ for more detail on building a flush valve focuser, as Bob mentions. Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! 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. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. It may need some careful coaxing with a screwdriver. This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. I decided to keep this tube for now and if I run into problems with it, I can replace it later. Thanks Bob. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". A week after they said they would send the secondary and other parts, I called to ask if things had been sent. This means I can use FocusMax to do the focusing. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. on Step 5, After much debit and doubt i have taken the photos down cause i cannot be 100% sure that they were taking from my scope as i was not there to verify them and i do not want my contest entry to be based on photos and not the build process. My other telescope is a Celestron NexStar C6E. My guess is that photo was taken with a refractor. homemade Crayford focuser. I decided that my best option was to scale up their 8 inch design for a 12.5 inch scope and sacrifice the portability and easier storage of a truss scope for something that I felt confident in building myself.
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