homemade telescope focuser

I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. control. If you look in the FILES area on Robert Brown's site (see link above) you will see a sub-folder "3D Printed Parts". As I understand, you are using it for a refractor. I Hope to give you ideas if you are thinking about building one for yourself! When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. I want to make this direct drive system work. Nice work and great instructable! This motor has a 5mm drive shaft. Let me see if I am able to collect all the parts needed. crafts, science & engineering, design, and technology. Someone is pulling someone's leg here. Ask Question Step 5: Stepper Motor Choice #2 - NEMA-17 Geared Stepper Motor If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the Rochester Astronomy Club. on Step 3. 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. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. The ARtemis module came in a kit form actually just two circuit boards one of which I had to source the parts, build and box myself. #@$%^#@!!!!! After another 3 weeks, I was concerned that I had not received the mirror. 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. Share it with us! I was inspired to build telescopes during a trip out to McDonald Observatory in west Texas, where I saw a 36 fork-mounted telescope, tiny in comparison to the huge research telescopes at the site. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. I paid the 50% deposit and dreamed of DSOs. 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. The cell from Anttler's, for which I had received a refund, had arrived. Able to make myself using my own humble tools (or toys as the pros will call them!). Earthbound1 likes this #2 dave brock Mercury-Atlas To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. 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. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". While round tubing is sturdy, square tubing is easier to work with. I was inspired to build telescopes during a trip out to McDonald Observatory in west Texas, where I saw a 36 fork-mounted telescope, tiny in comparison to the huge research telescopes at the site. I began building it in the spring of 2008, but the bulk of the work was done in July of 2008 with first light occurring on July 25. Using a compass I drew circles on the top and bottom of the ground board to mark the inside and outside of the teflon ring on the bottom of the rocker bottom. A Pocket Sundial From a Broken Pocket Watch! 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. This is not recommended for shared computers. Depending on your telescope, one of the Brackets that Robert has may work for you. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more 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. Look down through the empty focuser. The day I received the refund, I ordered a mirror cell from University Optics. In order to check your measurements, you can construct jigs for your mirror cell and secondary cage, positioning them on a straight, adjustable track such as 2 planks of wood. I suspected that the company was either in trouble or no longer in business. The next day my wife called me at work to tell me a box had arrived with telescope stuff. Trim off any unused fabric along the base. You really need a step ladder even for my 10" when pointed overhead. 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. The focuser shaft on the telescope is 13.1mm in diameter. The base and the rocker box in my telescope are secured with a skate bearing assembly but could be more simply attached with a bolt through the center. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! And the legs of the base should be as wide as possible to accommodate weight imbalance as the telescope is moved around, to avoid tipping. focusers for that project. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. Once I decided to build a scope myself I had to decide on the aperture of the scope. rod for the drive axle it would have a fairly fine motion. I started by trying to drill out a metal gear for the focuser shaft. I have several of the books on building a Dobsonian Telescope. I found a used 16 primary on eBay. I hate focusing. 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. (I didn't have the primary mirror yet). Make the hole diameter fairly snug, too. 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. Link to the motor speed controller kit:http://www.jaycar.com.au/productView.asp?ID=KC5225(a 5K external potentiometer will be required): http://www.jaycar.com.au/productView.asp?ID=RP3508The drive motor:http://www.jaycar.com.au/productView.asp?ID=YG2734The gears:http://www.jaycar.com.au/productView.asp?ID=YG2736The motor forward/reverse switch:http://www.jaycar.com.au/productView.asp?ID=ST0506The push button:http://www.jaycar.com.au/productView.asp?ID=SP0711 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. 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. If you mess up, you can turn the hole into a slot, but avoid drneilmb, thanks for sharing the focuser design. These will be stored in your browser only with your consent and you have the option to opt-out. Most people will want a knob on Your astrophotographer friend may have included his own images from his setup. 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. Thanks for the great comment. needle adds no friction that I can feel to the focus action. 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. I had considered using a clear finish alone, but decided to use a dark red finish on the base and a clear finish on the tube, just because I like the look. Make an account on JLCPCB.com, upload the Gerber zip file, that's it! 11 years ago 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. Finally, attach your polar alignment device and align it with the hinge. This can be shimmed out with paper wrapped around the Once I had my design set, I was ready to buy the parts. I wanted a tight / press fit, so I only added half that, 0.25mm. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. See the images how I plan to assemble it. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. I first tried my 32mm plossl eyepiece. 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. DO NOT drill out the holes in the board! This combination has proved to be effective for all positions except when the tube is pointed directly up. Download and unzip. 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 allowed me to cut perfect identical circles. It Bill, Impressive work and great idea about LSDF focuser. 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. You need some purple bits To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. It was easy enough to drill a hole and tap threads for a Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. So I was looking for a cheap, light-but-sturdy design for a You should now be able to drill the 4 holes at each corner. focuser. Able to make myself using my own humble tools (or toys as the pros will call them!) We tried this in our back yard, but found that it was too difficult to aim both the tube and the moving mirror at distant trees in our suburban yard. Thanks again for the 'ible. Edited by howardcano, 24 May 2020 - 09:29 PM. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. 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 have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. 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. knob, and a drill press to make sure the hole for the knitting needle "); Reply 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. We are now ready for some testing. I have not yet figured out a better way to hold the tube. 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. Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! telescope page, I wasn't really eager to buy two commercial Crayford #2 knitting needle would be just about right. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. in the tube so they'll hit the knitting needle before your drawtube runs My homemade motorized telescope focuser for Celestron C8. he might just have a $3200 camera, they aren't very hard to come by. The Dob is really a great design. 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. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. 7 years ago The little app is simple and works great. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. larger diameter. 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. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). Here are a few photos of the "bracket", which is a simple 3D printed plate that mounts to the telescope's focuser ring, and serves as a mount for the stepper motor. The mirror cell: University Optics (eventually). On the bottom of the Bottom board is a ring of Ebony Star laminate that glides over the three teflon pads located directly above the feet on the ground board. I redrilled the holes for the mirror cell and got ready to wrap it. Keeping with the 'simple ' part of your request, here is a helical 2"/1.25" focuser made from std plumbing parts.

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