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I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Shorter thread side will be used to attach the eyepiece. 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. If you wanted to really go low-profile with this design, 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. 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. 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. This scope was originally made as a travel scope using an eight inch mirror that I ground and polished at the St Pete Astronomy Clubs Mirror Lab. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . If you're not using heavy eyepieces, you probably don't need And a flat thing to put it all on Read the documentation though, there are a lot of functions and options. I think I got what I wanted and seems best solution for me. This means I can use FocusMax to do the focusing. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. Measure the diameter of the exposed shaft. 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.) needle so the knitting needle will be snug against the drawtube without 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. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. My homemade motorized telescope focuser for Celestron C8. 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. They eyepiece height ended up being about 5'10" high at zenith. I suppose that one could complete this project without these two tools, but it would be difficult to cut the pieces accurately enough for a good fit. The Artemis module works extremely well, and is to be strongly recommended. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. 5 weeks after I had ordered the mirror, I called to ask about its status. Telescope Magazine. 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. The mirror itself must also be able to tilt in three dimensions in order to aim its light at the secondary mirror (a process called collimation). guarantee a response, but I'll do my best to answer everyone who writes I set things up in daylight and collimated the scope. a 3/4" thickness. (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.) the drive shaft close against the drawtube. DO NOT drill out the holes in the board! The plastic will ride on teflon pads, creating just enough traction for the telescope to avoid sliding on its own while not making it too difficult to point at things in the sky. 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. I really had to, since the underside of my telescope's focuser is all curves, no flat area for attaching the mounting bracket. For my project I needed a 14 inch diameter, and I had a tough time finding one. I told them I was on my way. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. That helps with low-profile Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. 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. I do have another tube that can be used around the drawtube, but it doesn't really add anything. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. At this point, the scope was pretty much finished. The email bounced back to me. 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. It was May 12th. The telescopes size is classified by the size of its mirror. But I wanted a larger mirror, and, at that size, grinding my own was not an option. 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 Pretty dry but important! Place the focuser, draw the position of the screws with a pencil and remove the focuser. 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. Put it all together This can be shimmed out with paper wrapped around the And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. 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. By adjusting the bolts, the mirror can be pointed toward the correct spot. The rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. Next, attach the eyepiece and the focuser to the top part of the telescope tube. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. Your design is simple and nice. I got a different stain, tested it, and went back to work. Earthbound1 likes this #2 dave brock Mercury-Atlas Look down through the empty focuser. In my case I decided to make a custom bracket. he might just have a $3200 camera, they aren't very hard to come by. Nice one. you could probably space the bearings 3/4" apart instead of 1" and mount too far. Two inch internal diameter drawtube. DIY Truss Dob input: How to design truss? I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. It is size 1.25 inch with a clear inside dia-meter. 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 am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. I am using scrap upvc pipe material. They have many items for ATMers and I had frequently visited their website when planning my scope. 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. in the tube so they'll hit the knitting needle before your drawtube runs 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. Crayford-style design with four bearings and one driveshaft. Perfect for visual observations with very heavy mirrors. Save over 40% off the annual cover price for a full year (4 issues) of Make. The little app is simple and works great. 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. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. So, as they say, "back to the drawing board". Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. It's the same in form, but has a perfect, true 13.35mm hole. In amateur astrophotography, we run our telescopes overnight. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). - Bill. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. Have you made any mods on it since you built it? I had already made a lightweight focuser for Another vote for Pierre's helical Crayford design. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. 4 years ago The sides were attached with wood glue and clamps with a few small brads to hold everything in place. 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. All in all it seemed like a pretty robust design, so I gave it My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. larger diameter. Rock on! 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. If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. Edited by howardcano, 24 May 2020 - 09:29 PM. You can see that my Moonlite focuser was slightly larger than the sides of the tube. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. One of the neat things about the square design is that the Very simple and portable. I have no idea how much mail this idea will generate, so I can't The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. 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. It doesn't. A tilted focuser will have no effect on the image quality. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. As I understand, you are using it for a refractor. My homemade motorized telescope focuser for Celestron C8. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! Homemade astronomy. I was certain not to move the jig at all before cutting the second circle. ASIAIR - Is there an easy way to load Messier catalog into Autorun? Trim off any unused fabric along the base. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. This software creates a model of your telescope by measuring out of focus star sizes at various points. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. A project collaboration and documentation platform. It wouldn't be a two-speed design, but if I used a thin enough A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. can't click on it or copy and paste it; it's a graphic file to thwart Thanks Pinbout for sharing your design. 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. Download and unzip. I'd 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. Helical is one of the option i am considering. 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. I only do functional. the nylon screws going up from the bottom, but I found the knitting The length of the Rocker Front also had to be changed so that the outside edge of the Side Bearings matched the outside edge of the Rocker Sides precisely. Fast forward a few months to the next time I had the tube outside. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. 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. 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. Here is what I was working on but looks like I need a better design. After another 3 weeks, I was concerned that I had not received the mirror. Thanks again for the 'ible. 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. It just The base of the telescope should be a wide, sturdy square or circle of wood with teflon bearing pads matched to the ABS plastic ring of the rocker box. Here's my 8" f/6 travel scope with a 2" PVC draw tube and the helical Crayford focuser built right in the focuser board. Today I purchased what is called atank nipple in India. And a couple of upright bearing blocks. I then temporarily installed the secondary mirror so that I could measure the approximate distance to the center of the secondary in order to locate the holes for the focuser. Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. 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. on Step 5, 9 years ago Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. My secondary is 4; for tips on choosing size, click here. 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. After the second call, I received a response that it would be ready at the end of the following week. As the telescope tilts toward the horizon, the mirror must be supported on its edge. Not sure if it is available in the USA. I have not yet figured out a better way to hold the tube. Several of my Recent Images have been focused with this system. I plan to use an FTA over it in case an extension is needed. This is not recommended for shared computers. accessible by all ages and skill ranges. I had to take apart the focuser in order to get my bolts in place. Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. until a 2" eyepiece or 1.25" adapter is snug. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. Download the Gerber Files. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. It took a lot longer than I expected to receive my mirror and other parts from Discovery. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. tube and nut that fits the outside threads. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. Overall, I'm very happy with the outcome of this project - focusing is now a joy. I ended up modifying it a bit after printing. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. Electronics and software automate the process of taking pictures. spambots that search the internet for addresses to send junk mail to.) pageTracker._trackPageview(); The focuser knob had two set screws. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. Once you get it working, there's some calibration you need to do. This unit takes signals from your computer and drives the stepper motor on the focuser. The hole is made slightly larger than the shaft, this is normal. To test the concept I used a short piece of two inch PVC for the draw tube. To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co.