But let me see what items I can arrange to make a helical. NEMA-17 Stepper Motor - see below, there are two options. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. forward and back along with the drawtube when you focus, and you'll get 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. 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. 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. I only use the OTA. 11 years ago I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. I had chosen a boxy, rigid design for the binocular scope, so #@$%^#@!!!!! I started by trying to drill out a metal gear for the focuser shaft. I sourced my own Stepper motor and 1:150 reduction gearbox from RS, who are just up the road. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. This resulted in a gear that wasn't true and "wobbled" a bit. As I continued to read, however, I was struck by the many complications of the design and, frankly, how many ways I could screw it up. But, especially on cold evenings, the focus may go out in the middle of the night. I ended up modifying it a bit after printing. occurred to me that a square turned 45 degrees would give me two flat I added three inches for a margin of error and in case I need to rebalance the tube in the future, making a distance of 25 inches from the balance point of the tube to the rocker bottom. This can be shimmed out with paper wrapped around the As the authors describe the benefits of a truss design, it is hard to dispute their arguments. Attach the ball head to the top board. Nice looking telescope. The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Or in my case, back to SolidWorks :-). While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. 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! Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. 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. Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. This combination has proved to be effective for all positions except when the tube is pointed directly up. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. We use cookies to continuously improve our websites for you and optimize its design and customization. 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. They have many items for ATMers and I had frequently visited their website when planning my scope. Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. It would cost less and they have a very good reputation. Thicker knitting needles would be even Upload that main sketch to the Nano. "); A couple setscrews and you're up & running with an off the shelf solution. I decided to keep this tube for now and if I run into problems with it, I can replace it later. 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. The cell from Anttler's, for which I had received a refund, had arrived. 24 T-nuts, with matching 2 bolts and knobs, 8 Aluminum tubing, thin wall, 1 square, 4 lengths I got mine from Cycle 24, Black woven velveteen, 68 Cut it so it stretches along the 6 axis. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. That is dirt cheap compared to the cost of commercially available focusers, which can top $1000 and are much heavier than what we will build. After another 3 weeks, I was concerned that I had not received the mirror. You will have to line up the diagonal and primary so that you see a centered image of the sonotube opening and the spyder in the eyepiece hole. As the thread shows you could also build the dual speed version, all made of plywood, if you feel ready to tackle a slightly more complex project for a cost of about 5$ more. Orient this assembly to allow you to view an object on the far horizon. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. Slide the eyepiece into the focuser and try it out. The mount and tripod are pretty much useless for astrophotography. 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. can't click on it or copy and paste it; it's a graphic file to thwart Some quick tips to note if you are making a homemade telescope are: 1. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. 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. I attached them with very small brads, countersinking the brads. 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. PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. you don't need to paint it (or worry about paint flaking off it). I The plate has slotted screw holes for tensioning the 6mm belt. Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. I had designed the tube box so that there would be an extra inch around the tube. on Introduction. The secondary holder is adjustable, so I could didn't have to get the location perfect. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. Bill, Impressive work and great idea about LSDF focuser. Page 1 of 2 - DIY focuser design - posted in ATM, Optics and DIY Forum: Hi I am working on a diy focuser design for my 6 F/8 telescope and asking suggestions for simple focuser. Helicals are adaptable to both refractors and reflectors, but do not "play nice" with zoom eyepieces because "zooming" becomes a two handed operation to avoid changing focus. It may need some careful coaxing with a screwdriver. 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. with a genuine question or comment about the design. I waited until dark and pointed the scope at the sky. Fire up focusmax, and shoot some images! I wanted a tight / press fit, so I only added half that, 0.25mm. This makes for better sky photographs as the exposure time can be lengthened,. In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". 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 wanted the long focal length for good contrast. think that design would be rigid enough under the weight of a diagonal and an eyepiece. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. on Step 5. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . 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. 5 weeks after I had ordered the mirror, I called to ask about its status. Fairly easy to build and could be adapted to suit any SCT focuser. Able to shift heavy loads of kit ie over 1000g. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. Make the hole diameter fairly snug, too. The mirror cell: University Optics (eventually). 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. The pivot bolt consists of a 1 1/8 inch brass spacer with an 11/16 inch outer diameter, a 3/8 inch bolt 2 inches long, a stop nut, and two large washers. 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. And a flat thing to put it all on Two inch internal diameter drawtube. 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. I found a used 16 primary on eBay. I did not glue the bearings to the tube box in case I needed to adjust the position later. Two such companies would not give me a price because the order of a single tube was too small. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. The balance point determines the height of the rocker sides, so I had to get this far before I cut the wood for the base. 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. 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. Once I decided to build a scope myself I had to decide on the aperture of the scope. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. experimented with various wires and rods and eventually decided that a 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. Share it with us! 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. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. That helps with low-profile It's rigid, lightweight, and You should watch (and bookmark) this video. In addition, we use third-party cookies to help us analyze and understand usage. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. The motor is much lighter than the geared motor. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. 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. A week later the cell arrived (on schedule) from University Optics. drneilmb, thanks for sharing the focuser design. larger diameter. 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. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). We all know the problems with focusing. 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. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. You will need to order one sized for your telescope's focuser shaft size. Our websites use cookies to improve your browsing experience. I made this Crayford style focuser using plywood scraps and surplus bearings. focusers for that project. 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. Carve out a hole on the top part of the sonotube first. case you need more focuser travel than you thought. 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. This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. Topics such as I don't have the skills to build a focuser using a. the bearings right at the edge of the frame, reducing the frame to Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. Then it was time to stain and finish. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. 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. 8 years ago If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. Thanks Peter. Robert Brown did an excellent video on how to work out your stepper motor requirements. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. In my case I decided to make a custom bracket. 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. It was May 12th. This will determine the size of the coupler you will use to connect the stepper motor. haven't yet found any design elements that need improvement. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. 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. 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. 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. love to hear from people who are interested in this focuser design. installations. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. Able to make myself using my own humble tools (or toys as the pros will call them!) 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. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. For my project I needed a 14 inch diameter, and I had a tough time finding one. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. You will need to order one sized for your telescope's focuser shaft size. 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. Obviously an open truss telescope. Motion is very smooth. 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. Low, or Zero slop when changing direction. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time.

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