(actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. surfaces to put the bearings in and a vee at the bottom that would hold Unfortunately I don't have a 3d printer. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. 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. It's easy to shim it to exactly 2" with adhesive labels placed one at a time inside the tube until a 2" eyepiece or 1.25" adapter is snug. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. needle so the knitting needle will be snug against the drawtube without I'd The focuser knob had two set screws. The rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. See the images how I plan to assemble 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. 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. var gaJsHost = (("https:" == document.location.protocol) ? I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. 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. Start with the small components first. Edited by sunrag, 28 May 2020 - 10:44 PM. 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. Attach the ball head to the top board. The mount and tripod are pretty much useless for astrophotography. Two such companies would not give me a price because the order of a single tube was too small. 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. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. guarantee a response, but I'll do my best to answer everyone who writes Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. DO NOT drill out the holes in the board! DIY Craford Focuser. 10 years ago The focuser shaft on the telescope is 13.1mm in diameter. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. ill ask him for a detailed list of what he used and when i get that ill post it here for you. 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. This cost around $100 to build and all of the components came from. The bearings only need to be What materials did you use? too far. This is not recommended for shared computers. I sourced my own Stepper motor and 1:150 reduction gearbox from RS, who are just up the road. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. Telescope Magazine. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. Having an RS trade counter 2 miles away is such a luxury! After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. I found a used 16 primary on eBay. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . Orient this assembly to allow you to view an object on the far horizon. a "rubbery" feel. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. The mirror cell: University Optics (eventually). . Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. The curved sides of the Side Bearings are also covered with strips of Ebony Star that glide on the teflon pads on the curved edges of the Rocker Sides (figure 3). This sure is going to be a project I will work on. 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. I think I got what I wanted and seems best solution for me. The Artemis module works extremely well, and is to be strongly recommended. Best Wishes, Reply This arrangement turns 100% true, no wobble. There are some test sketches in the "Tests" folder, start with those. After another 3 weeks, I was concerned that I had not received the mirror. 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. my thoughts naturally gravitated toward a boxy focuser to go with it. After picking up a copy of The Dobsonian Telescope by David Kriege, I built my first telescope with a 12-diameter mirror, then later tackled a 12 lightweight scope. There are sub-folders for the different versions. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. Did you make this project? Here is a link to the main FILES area on Robert Brown's site. Since these focusers were going side-by-side on a binocular It was important that the two circles be identical because the edges had to match perfectly when glued together and the two side bearings had to be identical in order for the altitude motion to work well. I've been using the above pair 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. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. 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. on Introduction. This resulted in a gear that wasn't true and "wobbled" a bit. 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. Download and check them out, I just grabbed the first one and printed it. 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. In amateur astrophotography, we run our telescopes overnight. As the authors describe the benefits of a truss design, it is hard to dispute their arguments. Bill, Impressive work and great idea about LSDF focuser. The part is very strong! 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. I decided to order an aluminum mirror cell from University Optics instead so that the mirror could be supported at 9 different points. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. an eyepiece. We then spread contact cement over the remaining veneer and tube surface, waited for the glue to dry, and carefully rolled the tube over the veneer. However more than the focuser, I liked your scope. A 6 in primary mirror does not have enough weight to make the dob stable. 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. accessible by all ages and skill ranges. a try. 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. While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. My secondary is 4; for tips on choosing size, click here. knitting needle where it goes through the hole, so it's not a big deal, CNC files (optional) Download the Sketchup files. The belt and pulleys are off-the-shelf items available on Amazon. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. Here is what I was working on but looks like I need a better design. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. on Step 5. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. 7 years ago 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. It is used to setup water outlet from overhead water tanks. After another 3 weeks, I was concerned that I had not received the mirror. knob, and a drill press to make sure the hole for the knitting needle The little app is simple and works great. I hate focusing. 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. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. See above, this motor does not produce a lot of torque, but you don't need much for this application since there is no 'load' on the focusing shaft. Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. 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. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. This is where you will use screws to strongly attach the focuser onto the tube. Showcasing amazing maker projects of 2022. 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. Once I decided to build a scope myself I had to decide on the aperture of the scope. I suspected that the company was either in trouble or no longer in business. Thanks again for the 'ible. A week later the cell arrived (on schedule) from University Optics. It just help eliminate slippage when the focuser is pointed straight upward. 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. His project is very well documented. After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. My telescope is the Orion ED80T-CF. 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. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. 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. 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. the drive shaft close against the drawtube. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. Orion Dynamo Mini for powering a Nexstar 6SE? I did not wrap the tube until I had completed the base. If not, you may need to design and print your own bracket(s), gears, and so on. 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. Two inch internal diameter drawtube. (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.) This motor is available on Amazon. 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. larger diameter. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. 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. can't click on it or copy and paste it; it's a graphic file to thwart widening the hole. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. Nice one. I had some carboy caps that make good knobs. 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. We all know the problems with focusing. I paid the 50% deposit and dreamed of DSOs. by cranking Thank you for your pages. Drill the holes for the knitting 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. I'm' glad I did, because I didn't like the first color that I had chosen. 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. Another vote for Pierre's helical Crayford design. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. astronowanabe, Pierre Lemay, LarsMalmgren and. Did you make this project? Their step by step instructions were invaluable to me as I built this scope. They eyepiece height ended up being about 5'10" high at zenith. You can see that my Moonlite focuser was slightly larger than the sides of the tube. 11 years ago 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. scope, I only put knobs on the outsides. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Edited by howardcano, 24 May 2020 - 09:29 PM. Two of the holes for the bolts were blocked by knobs. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. in the tube so they'll hit the knitting needle before your drawtube runs If you're not familiar with Arduino, watch some tutorial videos. Position "0" is with the focuser all the way IN (at least for a refractor). 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. I didn't bother reading his whole article to figure out what f/# he used) I am not trying to say that good AP isn't possible with a sonotube scope, (the 'friend' may very well have pulled it out of the dob mount, added rings and a dovetail, and mounted it on his CGE-Pro or comparable) but in this case it is unlikely.". Secondary mirror with spider holder Search on eBay for a matched set. In my build, the minimum eyepiece-to-secondary mirror distance (13) plus the primary-to-secondary mirror distance (57) equals the focal length of 71, which is roughly 4.5 times the width of the 16 mirror. It doesn't. A tilted focuser will have no effect on the image quality. Funny how the bigger they are the better for dobs. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. Several functions may not work. (A badly tilted focuser may subtly alter the illumination pattern of the focal plane to a degree that would be impossible to perceive visually but that's about it.) I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. 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. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. Maker-written books designed to inform and delight! The Focuser and other items: (Scope Stuff). 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. Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. After the second call, I received a response that it would be ready at the end of the following week. (Technically, it should have been 62.5 for a 12.5 inch f/5, but when the mirror came it had a note on the back that the focal length was 61 inches.) My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. 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. When you add the minimum distance from the eyepiece to the secondary mirror together with the distance from the secondary mirror to the primary, the total length should be the primary mirrors focal length. 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. Now attach the screw eyes and the rubber band on the side of the board. I ground and figured the mirror with little troubles, making my focault tester, etc. This design could be adapted to practically any telescope or focuser, so I've kept my outline on the project brief. 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.) It is size 1.25 inch with a clear inside dia-meter. Obviously an open truss telescope. Connect the Arduino USB cable and upload some test sketches. My guess is that photo was taken with a refractor. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. The extra force will also When you figure out SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. Those are the last screws to be tightened. Concluding that I would not be able to buy a tube off the shelf, I found a couple of companies that took special orders on cardboard tubes.

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