homemade telescope focuser

Finally it was etched in caustic soda, and anodised matt black. While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct. Not sure if it is available in the USA. CNC files (optional) Download the Sketchup files. It stalled when tension on the belt increased. 11 years ago Pierre Lemay, thanks for sharing your simple and incredible design. 4 years ago The box should be deep enough to allow the mirror box to swing all the way down. (actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. flexing. I drew a guide line straight down the side of the tube and cut the veneer to length with one extra inch on each side68 inches long. weight. I made this Crayford style focuser using plywood scraps and surplus bearings. too far. 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. But -- you have to be careful that the mechanism is true and the motor does not have a load on it at any time, otherwise it will 'stall' and stop moving. Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. It doesn't. A tilted focuser will have no effect on the image quality. Start with the small components first. 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. I had designed the tube box so that there would be an extra inch around the tube. Once its cut to length, drill a hole through each end of the tubing with a drill press. Un-real!!! An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. The telescopes size is classified by the size of its mirror. Orion Dynamo Mini for powering a Nexstar 6SE? The focuser is very smooth. was straight so I wouldn't get a wobbly knob. Most of these have one or two set screws. forward and back along with the drawtube when you focus, and you'll get As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. This allowed me to cut perfect identical circles. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. I attached three feet equally spaced on top of the ring, and on the opposite side attached teflon pads 1 X 1 directly above the feet using very small brads and countersinking the brads below the surface of the teflon. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. The plate has slotted screw holes for tensioning the 6mm belt. I don't *do* pretty. in the tube so they'll hit the knitting needle before your drawtube runs This arrangement turns 100% true, no wobble. 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. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. . 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. 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. (Sorry you More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. The lumber yard also gave me a lower price than I expected. can't click on it or copy and paste it; it's a graphic file to thwart DIY Truss Dob input: How to design truss? spambots that search the internet for addresses to send junk mail to.) - Bill. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. 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. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. It took yet another call a week later for the items to actually be mailed. Two inch internal diameter drawtube. So I was looking for a cheap, light-but-sturdy design for a 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. My guess is that photo was taken with a refractor. I plan to use an FTA over it in case an extension is needed. telescope page, I wasn't really eager to buy two commercial Crayford Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! on Step 5, 9 years ago 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. but try for a snug fit if you can. I started with a spacer that with a inch outer diameter. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, As the authors describe the benefits of a truss design, it is hard to dispute their arguments. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. Fairly easy to build and could be adapted to suit any SCT focuser. 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. think that design would be rigid enough under the weight of a diagonal on Introduction, Very nice build nikon20. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. My homemade motorized telescope focuser for Celestron C8. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. My wife helped me by moving the mirror into and out of the tube around the marked spot while I stood at the eyepiece trying to bring some distant trees into focus. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. Pretty dry but important! The original Crayford Focuser is on display there. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. To cut the circles, I started with a depth of about 1/8 inch, then lowered the bit and cut a little more with each pass until I was through the board. stronger, but would give me a coarser focus action because of their So, as they say, "back to the drawing board". I ground and figured the mirror with little troubles, making my focault tester, etc. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. I had nearly completed the base and put things together for the first time. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. But who cares, really? While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. After waiting for the stain to dry for a day, I applied polyurethane in two coats, going over the surface with 0000 steel wool between coats. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); 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. By adjusting the bolts, the mirror can be pointed toward the correct spot. Carve out a hole on the top part of the sonotube first. . Picture of DS-4. crafts, science & engineering, design, and technology. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. I This was to allow the circle cutting jig to be attached to the board to cut the arcs from a center point of 25 inches above the ground. All that remained was to design and print a bracket, and buy the needed parts. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). 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. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. Thicker knitting needles would be even Two of the holes for the bolts were blocked by knobs. After waiting for the contact cement to dry to the touch, and with my wife's help, I carefully aligned the edge of the veneer with the guideline on the tube and pressed the first inch together. The wide square footprint would make it pretty stable when mounted to It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. 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. 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. My other telescope is a Celestron NexStar C6E. drneilmb, thanks for sharing the focuser design. I got a different stain, tested it, and went back to work. Interfaced with a computer, so the computer can make the decisions about where the best focus is. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. Most people will want a knob on My plan for wrapping the tube seemed good, but I am not too pleased with the final result. Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. Nice work and great instructable! 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 sure is going to be a project I will work on. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. Download and check them out, I just grabbed the first one and printed it. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, PCB (printed circuit board) - download the, DRV8825 - stepper motor driver chip/board - again, clones available on. Homemade astronomy. I don't have the skills to build a focuser using a. For a while I decided that 10 inch would be the best size. Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts. The overall project is super cheap, we're building this thing for something like $50 in materials. 4 years ago Once I decided to build a scope myself I had to decide on the aperture of the scope. accessible by all ages and skill ranges. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. The Focuser and other items: (Scope Stuff). try { The rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. 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. I only use the OTA. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. I applied contact cement to the first inch of the veneer and the mating inch of the tube. I first tried my 32mm plossl eyepiece. "); Crayford-style design with four bearings and one driveshaft. After the second call, I received a response that it would be ready at the end of the following week. They suggested a construction supply place on the other side of the city that I had not called yet.

Crockpot Hamburger Patties With Cream Of Mushroom Soup, Nanoxidil And Cats, Articles H