I made this Crayford style focuser using plywood scraps and surplus bearings. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. How to build a 12.5 inch closed tube Dobsonian telescope. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. both sides. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. Once the pieces were cut and I held them around the tube, I decided to cut them a bit smaller because the extra space was too much. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. I want to make this direct drive system work. a "rubbery" feel. my thoughts naturally gravitated toward a boxy focuser to go with it. Now I can simply insert the PVC cap on the end of a 4" pvc tube. Our websites use cookies to improve your browsing experience. I bought a 4" PVC Sewer pipe cap, used a hole saw to cut a 2.25" hole then attached the helical thing to the PVC cap. The little app is simple and works great. needle adds no friction that I can feel to the focus action. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. This book describes in great detail the steps to build a large aperture truss tube dob, focusing on scopes with a 12.5 to 40 inch mirror. I had the thought that as long as I was going to build it I should build it as big as I could afford. eyepiece on the ground (or worse, on your primary mirror!) on Step 5. If you look in the FILES area on Robert Brown's site (see link above) you will see a sub-folder "3D Printed Parts". It wouldn't be a two-speed design, but if I used a thin enough It seems to I wasn't there so i can be 100% but i do not think my friend was lying to me and i believe the pictures are from my telescope my kids use it for stargazing a lot i have seen some deepspace but i use it mainly for sketching the moon and i like to view solar flares. tube and nut that fits the outside threads. Next, attach the eyepiece and the focuser to the top part of the telescope tube. The Dob is really a great design. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. A 6 in primary mirror does not have enough weight to make the dob stable. As the authors describe the benefits of a truss design, it is hard to dispute their arguments. Measure the diameter of the exposed shaft. I took the whole tube assembly outside. Not sure if it is available in the USA. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. 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. Save over 40% off the annual cover price for a full year (4 issues) of Make. Then it was time to stain and finish. Depending on your telescope, one of the Brackets that Robert has may work for you. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. I have not yet figured out a better way to hold the tube. 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. Many sources point out that 10 inches is a kind of sweet spot in the balance between power and portability. One 6in dob I made was a complete failure. With the DRV8825 and Arduino Nano plugged in, the basic board is complete. Robert Brown did an excellent video on how to work out your stepper motor requirements. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. DIY Truss Dob input: How to design truss? Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. You currently have javascript disabled. occurred to me that a square turned 45 degrees would give me two flat i am not trying to win this contest with photos. The lumber yard also gave me a lower price than I expected. On that noteWARNING:do not look directly into the sun and never point a telescope into the sun without proper filtration you can damage your telescope and burn your retinas and possibly go blind i am not a astrophotographer so i cant comment on the quality of the pictures since there is so much doubt on the photos i will gladly take them down. with a genuine question or comment about the design. The mirror cell: University Optics (eventually). I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! 11 years ago on Introduction. Rather than use a sheet of plastic Kydex to finish the tube, as recommended in K/B, I ordered a sheet of birch veneer. by cranking love to hear from people who are interested in this focuser design. Most of these have one or two set screws. needle to be just a little too flexible for the weight of a diagonal and I sourced my own Stepper motor and 1:150 reduction gearbox from RS, who are just up the road. That's pretty much the focuser. And a flat thing to put it all on This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. I'm' glad I did, because I didn't like the first color that I had chosen. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. 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. I placed my telrad, optical finder, and an eyepiece on the focuser end of the tube and, using a broomstick as a balance point, found that the tube balanced 22 inches from the bottom. a try. . To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. adapter set screws to slide into. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. Share it with us! My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. With an outer diameter of 14 3/16, I cut the Tube Box sides 15 5/8 and 14 5/8slightly less than my extra inch extra on each side. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. It has reminded me of one of my long term aims to make a telescope that has been buried by the demands of the rest of my life! There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. It was May 12th. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. 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. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! My first telescope I built was a 10" F8. larger diameter. Crayford-style design with four bearings and one driveshaft. crafts, science & engineering, design, and technology. Trim off any unused fabric along the base. 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. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. #2 knitting needle would be just about right. I made a similar helical focuser with a nice 2 inch thing I found in Classifieds. That way you won't be dropping your drawtube and As I understand, you are using it for a refractor. The part is very strong! Today I purchased what is called atank nipple in India. After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. The drawings are only approximately to scale. I found a used 16 primary on eBay. The Artemis module works extremely well, and is to be strongly recommended. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Part numbers 351-4574 and 336-422. When you figure out 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. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. I will get good 30-40 mm focusing range. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. Once its cut to length, drill a hole through each end of the tubing with a drill press. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. I told them to take their time and get it right. So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more I don't have the skills to build a focuser using a. Share it with us! needle so the knitting needle will be snug against the drawtube without ScopeStuff is awesome!! 7 years ago My secondary is 4; for tips on choosing size, click here. he might just have a $3200 camera, they aren't very hard to come by. It has a 6mm shaft. The mirror itself must also be able to tilt in three dimensions in order to aim its light at the secondary mirror (a process called collimation). They have many items for ATMers and I had frequently visited their website when planning my scope. The overall project is super cheap, we're building this thing for something like $50 in materials. Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). 5 weeks after I had ordered the mirror, I called to ask about its status. A 10 inch scope would not be very much longer or heavier than my 6 inch, yet it would allow me to see much more. 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. Your design is simple and nice. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. A wide hole will let the knitting needle creep corners of the squares provide nice nooks for the eyepiece and eyepiece So I was looking for a cheap, light-but-sturdy design for a NEMA-17 Stepper Motor - see below, there are two options. 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. Make the hole diameter fairly snug, too. 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 have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. I don't have the skills to build a focuser using a. off the bearings. DIY Craford Focuser. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. The extra force will also large in diameter (1.6") so that adds to the fine-ness of the focus Although they don't usually sell these parts, because I had ordered the mirrors from them they offered to sell me the spider and secondary holder that they use in their scopes. help eliminate slippage when the focuser is pointed straight upward. The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. 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. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. Also no obvious diffraction spikes in the m31 photo. homemade Crayford focuser. stronger, but would give me a coarser focus action because of their I decided to use baltic birch because it is recommended by Kriege and Berry as well as many online sources. 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. CNC files (optional) Download the Sketchup files. The hole is made slightly larger than the shaft, this is normal. I will post the pic of final focuser once ready. To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co. 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Orion Dynamo Mini for powering a Nexstar 6SE? 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. (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.) This software creates a model of your telescope by measuring out of focus star sizes at various points. rod for the drive axle it would have a fairly fine motion. The only thing on the list that was a bit difficult to find was baltic birch plywood, which had to be special ordered from the lumber yard. 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.
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