narrow the frame. Just to make sure I liked the stain, I applied some to a piece of scrap wood. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. Earthbound1 likes this #2 dave brock Mercury-Atlas Lining up this center point with the center of the top of the side bearing, I brought the corner of the side bearing up to the edge of the tube box and attached it with screws. The focuser is very smooth. 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. the drive shaft close against the drawtube. Today I purchased what is called atank nipple in India. Next, attach the eyepiece and the focuser to the top part of the telescope tube. Have you made any mods on it since you built it? 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. small, it's surprisingly rigid. 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 All that remained was to design and print a bracket, and buy the needed parts. on my binocular scope for quite a while now and really like them. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. The email bounced back to me. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. I attached them with very small brads, countersinking the brads. Crayford-style design with four bearings and one driveshaft. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. This can be shimmed out with paper wrapped around the I have no idea how much mail this idea will generate, so I can't Look down through the empty focuser. Drill the holes for the knitting What materials did you use? 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 wasn't there so i can be 100% but i do not think my friend was lying to me and i believe the pictures are from my telescope my kids use it for stargazing a lot i have seen some deepspace but i use it mainly for sketching the moon and i like to view solar flares. I read the entire thread and surely its going to help me building my focuser. I had some carboy caps that make good knobs. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". Your choice here will be recorded for all Make.co Websites. I've been using the above pair We use cookies to continuously improve our websites for you and optimize its design and customization. As I read the book I decided that I should build a 12.5 inch truss tube scope. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. needle so the knitting needle will be snug against the drawtube without I am a retired USAF electronics engineer, and might even do much of the construction of the base with welded structural tubing, as, I do have a complete metal working shop besides my wood shop, here. I'm' glad I did, because I didn't like the first color that I had chosen. This will determine the size of the coupler you will use to connect the stepper motor. Several of my Recent Images have been focused with this system. Position "0" is with the focuser all the way IN (at least for a refractor). The drawings are only approximately to scale. I'd the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. Once I decided to build a scope myself I had to decide on the aperture of the scope. You should now be able to drill the 4 holes at each corner. You will need to order one sized for your telescope's focuser shaft size. 1" Rack & Pinion Focuser. DIY Craford Focuser. I redrilled the holes for the mirror cell and got ready to wrap it. wobbly knob still works, and adds character. Two of the holes for the bolts were blocked by knobs. The bearings only need to be If you found some good surplus lenses, you will have made a stunningly good objective for your scope. 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. Home centers and hardware stores did not carry large sizes. accessible by all ages and skill ranges. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. can't click on it or copy and paste it; it's a graphic file to thwart occurred to me that a square turned 45 degrees would give me two flat I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. 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. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. Electronics and software automate the process of taking pictures. 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. It is used to setup water outlet from overhead water tanks. 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. Thanks Bob. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. I did not wrap the tube until I had completed the base. 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. This unit takes signals from your computer and drives the stepper motor on the focuser. Well, it sort of looks like a focuser.. See pictures below. As I mentioned on my binocular See captioned photos 22-25 here:https://www.cloudyniractor-focuser/ for more detail on building a flush valve focuser, as Bob mentions. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. The ARtemis module came in a kit form actually just two circuit boards one of which I had to source the parts, build and box myself. I tried this one first and found it wouldn't work for my application. weight. Very simple and portable. (actually, it ended up a smidge more than 2 inches). 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. This focuser (see pic at bottom) was motorised by me several years ago, but the motorised system didn't give me very fine control, and the motor running at fast speed tended to make the Artemis camera crash. var pageTracker = _gat._getTracker("UA-1008534-4"); However more than the focuser, I liked your scope. like, you can have as much focuser travel as you want no matter how It take automatic control of the CCD camera and focuser, and dances around magically on the screen, arriving at perfect focus within about 30s to 3 minutes depending on where you started from. When you figure out The telescopes size is classified by the size of its mirror. I told them I was on my way. That helps with low-profile It took a lot longer than I expected to receive my mirror and other parts from Discovery. In addition, we use third-party cookies to help us analyze and understand usage. 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. It wouldn't be a two-speed design, but if I used a thin enough 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 Let me see if I can get similar plumbing parts here. Please re-enable javascript to access full functionality. Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. Several clamps were used to hold the pieces together overnight. All Dobsonian telescope projects are unique buildshere are the notes from my latest version to help get you familiar with the process and determine how youll design yours. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). ASIAIR - Is there an easy way to load Messier catalog into Autorun? 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. Knitting needles are A week later the cell arrived (on schedule) from University Optics. 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. 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. Edited by sunrag, 28 May 2020 - 10:44 PM. Yet I was also becoming infected with aperture fever. As I understand, you are using it for a refractor. The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Their step by step instructions were invaluable to me as I built this scope. Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. I only do functional. on Step 5. 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. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. 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. The cell from Anttler's, for which I had received a refund, had arrived. Contact cement is permanent, so the only solution would be to replace the tube! After another 3 weeks, I was concerned that I had not received the mirror. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. Thanks Pinbout for sharing your design. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. I wanted the long focal length for good contrast. tube and nut that fits the outside threads. We are now ready for some testing. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. 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 have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. This means you lose much of the night's images. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Coupler for NEMA-17 Stepper Motor (also two choices, see below), LM7808 Voltage Regulator with TO-220 package -, Mini On/Off 3-pin 2-position slide switch -, Headers and wire (miscellaneous sizes and gauges), these are important so you can replace the component if it is damaged, LM7808 voltage regulator w/TO-220 heat sink package, 2-pin headers for 12V power and on/off switch. 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. Edited by howardcano, 24 May 2020 - 09:29 PM. I only use the OTA. exactly 2" with adhesive labels placed one at a time inside the tube I marked the spot and moved things back inside to install the mirror. think that design would be rigid enough under the weight of a diagonal I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. 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 . Some of these are essential for the basic functionalities of our websites. 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. PVC pipe makes great drawtubes. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. my 12.5" trackball, but I didn't I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. A wide hole will let the knitting needle creep I drilled the holes in the center of the ground board and rocker bottom using a 9/16 bit, thinking that I needed the extra 1/16 so that the spacer could move. The glue should keep the nylon from fraying. I brought a saw with me so that I cut it in half to fit in my minivan. You should watch (and bookmark) this video. I will get good 30-40 mm focusing range. the bearings right at the edge of the frame, reducing the frame to Thanks again for the 'ible. You really need a step ladder even for my 10" when pointed overhead. The secondary holder is adjustable, so I could didn't have to get the location perfect. 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. corners of the squares provide nice nooks for the eyepiece and eyepiece Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. 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. he might just have a $3200 camera, they aren't very hard to come by. 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. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. 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 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 mount and tripod are pretty much useless for astrophotography. 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. Able to make myself using my own humble tools (or toys as the pros will call them!). Shorter thread side will be used to attach the eyepiece. Cost is $25 - $30, and you will have 5 PCBs in about a week. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! Low, or Zero slop when changing direction. Connect the Arduino USB cable and upload some test sketches. I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. I had chosen a boxy, rigid design for the binocular scope, so As the authors describe the benefits of a truss design, it is hard to dispute their arguments. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). 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. Funny how the bigger they are the better for dobs. Orion Dynamo Mini for powering a Nexstar 6SE? Likewise, the side bearings are made of two identical semicircles of 5/8 inch plywood glued together, creating side bearings that are 1 inches thick. If you follow the procedures described above, your telescope's optics will be perfectly aligned. You can see that my Moonlite focuser was slightly larger than the sides of the tube. Share it with us! you don't need to paint it (or worry about paint flaking off it). Make an account on JLCPCB.com, upload the Gerber zip file, that's it! That way you won't be dropping your drawtube and The belt and pulleys are off-the-shelf items available on Amazon. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. Fire up focusmax, and shoot some images! larger diameter. Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. 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.
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