Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. That way you won't be dropping your drawtube and I feel it is a wonderful thing to free oneself from the "store-bought" world, as Tombaugh did, and to use your imagination and skills to develop your own, personal way of viewing the sky. A on Introduction. As I read the book I decided that I should build a 12.5 inch truss tube scope. Have you made any mods on it since you built it? My homemade motorized telescope focuser for Celestron C8. I made this Crayford style focuser using plywood scraps and surplus bearings. Maker-written books designed to inform and delight! I like the old way of using stepper motors and other stuff introduced years ago by Mel Bartels, he is a master for me. We are now ready for some testing. The part is very strong! It may need some careful coaxing with a screwdriver. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. The focuser shaft on the telescope is 13.1mm in diameter. I told them to take their time and get it right. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. 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. Telescope Magazine. Homemade astronomy. The Focuser and other items: (Scope Stuff). The next day my wife called me at work to tell me a box had arrived with telescope stuff. I had some carboy caps that make good knobs. I redrilled the holes for the mirror cell and got ready to wrap it. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. All i did was supply the telescope as far as his camera equipment i dont know what he used i never saw it all i know is he had my scope for about a month while i was traveling and he gave me these photos. you could probably space the bearings 3/4" apart instead of 1" and mount on Step 1, Richards in our local astronomy club. 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. After the second call, I received a response that it would be ready at the end of the following week. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. Crayford-style design with four bearings and one driveshaft. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. Unfortunately I don't have a 3d printer. Robert Brown did an excellent video on how to work out your stepper motor requirements. Able to make myself using my own humble tools (or toys as the pros will call them!). I was certain not to move the jig at all before cutting the second circle. on Introduction. I tried this one first and found it wouldn't work for my application. homemade Crayford focuser. 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. until a 2" eyepiece or 1.25" adapter is snug. I used one of these scrap pieces to draw an angle of 70 degrees to the edge of the arc so that I could later place the teflon pads on the arcs. They eyepiece height ended up being about 5'10" high at zenith. 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. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. 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. A bit of a monster! It just 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. 4 years ago As the telescope tilts toward the horizon, the mirror must be supported on its edge. Did you make this project? installations. They said they would make the brackets extra long to accommodate the mirror and it would take about a week. Once I had my design set, I was ready to buy the parts. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. 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. Reply accessible by all ages and skill ranges. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. The belt and pulleys are off-the-shelf items available on Amazon. I attached small felt pads to the inside of the keepers to protect the side bearings from scratches, but discovered that the side bearings would not fit because of the thickness of the pads. my 12.5" trackball, but I didn't 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. on Step 5. It is used to setup water outlet from overhead water tanks. I have seen some VERY impressive photos similar to those, taken with Nikon D700 and D300 cameras, with the proper filters- and mounts- on a quality scope. After the glue dried but before the clamps were removed, I added corner braces to all four corners of the tube using glue and brads to hold them in place. The drawings are only approximately to scale. I tried all of my other eyepieces and found that I could bring the image into focus in the other eyepieces, but it was very near the bottom of the focuser travel. Here is what I was working on but looks like I need a better design. Share a cool tool or product with the community. Also no obvious diffraction spikes in the m31 photo. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. Carve out a hole on the top part of the sonotube first. corners of the squares provide nice nooks for the eyepiece and eyepiece They have many items for ATMers and I had frequently visited their website when planning my scope. Topics such as
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. My other telescope is a Celestron NexStar C6E. A week later the cell arrived (on schedule) from University Optics. 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. This makes for better sky photographs as the exposure time can be lengthened,. Primary telescope mirror aftermarket, homemade, or custom-made. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. I started with a spacer that with a inch outer diameter. This combination has proved to be effective for all positions except when the tube is pointed directly up. 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. Your design is simple and nice. 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. it sticks into your light path. "); Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . the bearings, totally eliminating any flex. If you're not familiar with Arduino, watch some tutorial videos. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. Un-real!!! the side of a rigid secondary cage. If you're going for simple, have you considered a helical focuser? I am using scrap upvc pipe material. 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. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. larger diameter. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). In amateur astrophotography, we run our telescopes overnight. 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. Share it with us! Very simple and portable. New Creation Tamil 6.96K subscribers Welcome to New Creation Tamil Our Channel include of Guiding Videos: 1.DIY Projects 2.Awesome Ideas 3.Tips You are inter with New Creation Tamil you can enjoy. he might just have a $3200 camera, they aren't very hard to come by. Just to make sure I liked the stain, I applied some to a piece of scrap wood. Make an account on JLCPCB.com, upload the Gerber zip file, that's it! 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. 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. It has a 6mm shaft. adapter set screws to slide into. 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 Hope to give you ideas if you are thinking about building one for yourself! So, for my telescope I used a 6mm to 5mm coupler available on Amazon. Read the documentation though, there are a lot of functions and options. But who cares, really? My first telescope I built was a 10" F8. I call shenanigans on every picture in this post except for the the moon. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. 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. Finally it was etched in caustic soda, and anodised matt black. It's rigid, lightweight, and This can be shimmed out with paper wrapped around the Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). on Step 5, 9 years ago
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