. It is size 1.25 inch with a clear inside dia-meter. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. scope, I only put knobs on the outsides. It was May 12th. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. To hold the tube in place within the tube box, I used a combination of pieces of felt inside the box and wooden shims between the tube and the box. var pageTracker = _gat._getTracker("UA-1008534-4"); 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. After researching several possible sources for a primary mirror, I decided to order an f/5 12.5 inch mirror from Discovery Optics. The specific hardware used for this is described on the Building page. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. I'm also going to focus on only one version of Robert's focuser (there are many). Also no obvious diffraction spikes in the m31 photo. I am well versed in technology, have all the tools necessary to build my own! I don't *do* pretty. The base of the telescope should be a wide, sturdy square or circle of wood with teflon bearing pads matched to the ABS plastic ring of the rocker box. 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. . 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 balance point determines the height of the rocker sides, so I had to get this far before I cut the wood for the base. My telescope is the Orion ED80T-CF. But, especially on cold evenings, the focus may go out in the middle of the night. spambots that search the internet for addresses to send junk mail to.) This is the upper tube that contains the flat secondary mirror, Telrad finder, and focuser. exactly 2" with adhesive labels placed one at a time inside the tube wobbly knob still works, and adds character. I have not yet figured out a better way to hold the tube. Able to shift heavy loads of kit ie over 1000g. As the telescope tilts toward the horizon, the mirror must be supported on its edge. So, as they say, "back to the drawing board". Featured in the February, 2015 issue of Sky & Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. 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. A 6 in primary mirror does not have enough weight to make the dob stable. For the ATMer I do find that there are an endless number of parts that can be designed and printed for home built telescopes and binoscopes. This is the first telescope that I have built. Share it with us! A wide hole will let the knitting needle creep This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. A week later the cell arrived (on schedule) from University Optics. 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. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. Perfect for visual observations with very heavy mirrors. I described it two years ago in this thread:https://www.cloudyniuser/?p=8879835 . 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. It took a lot longer than I expected to receive my mirror and other parts from Discovery. 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. This can be shimmed out with paper wrapped around the If you mess up, you can turn the hole into a slot, but avoid I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. 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. This allowed me to cut perfect identical circles. They have many items for ATMers and I had frequently visited their website when planning my scope. I call shenanigans on every picture in this post except for the the moon. Install on Windows 10, this part is pretty straightforward. tube and nut that fits the outside threads. But let me see what items I can arrange to make a helical. I told them to take their time and get it right. In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. I got a different stain, tested it, and went back to work. I'd 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. 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. needle so the knitting needle will be snug against the drawtube without Bill, Impressive work and great idea about LSDF focuser. I like the old way of using stepper motors and other stuff introduced years ago by Mel Bartels, he is a master for me. Your choice here will be recorded for all Make.co Websites. After the second call, I received a response that it would be ready at the end of the following week. One of the companies I had considered as a supplier for the primary mirror was Anttler's Optical. I set things up in daylight and collimated the scope. I called in the order and explained that I would be using a mirror two inches thick. work really well, for a fraction of the cost of a commercial Crayford guarantee a response, but I'll do my best to answer everyone who writes It seems to Only problem is if I put a diagonal it wants to rotate the helical part. This arrangement turns 100% true, no wobble. The glue should keep the nylon from fraying. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. 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. I called to express my concern and was told that it had all been packaged a few weeks ago and that it, For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of, After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. I read the entire thread and surely its going to help me building my focuser. As I understand, you are using it for a refractor. 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. (Sorry you A Pocket Sundial From a Broken Pocket Watch! Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. I wanted the long focal length for good contrast. 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. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. My guess is that photo was taken with a refractor. 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. 11 years ago Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. an inch or so apart, so the focuser body could be pretty low profile. 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. Over how many nights did this photography session take place? Just drill holes in both ends and mount the lenses. 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.) Telescope Magazine. It wouldn't be a two-speed design, but if I used a thin enough So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. Most of these have one or two set screws. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. 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. 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. 4 years ago You can see that my Moonlite focuser was slightly larger than the sides of the tube. initiatives for the next generation of makers. I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Find a special something for the makers in your life. And, once your telescope is finished, be sure to join a local astronomy club to learn more about the sky and share your hobby with others. Gift the gift of Make: Magazine this holiday season! Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. I do have another tube that can be used around the drawtube, but it doesn't really add anything. I decided to order a mirror cell from them because the owner had talked about a new cell he was excited about. Not sure if it is available in the USA. 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. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. 11 years ago My other telescope is a Celestron NexStar C6E. When you want to focus, you just open the program and press focus. I marked the spot and moved things back inside to install the mirror. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & All in all it seemed like a pretty robust design, so I gave it To test the concept I used a short piece of two inch PVC for the draw tube. If you're not familiar with Arduino, watch some tutorial videos. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. To get this arc, I actually moved the radius of the jig, At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . 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. 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. However more than the focuser, I liked your scope. 11 years ago We all know the problems with focusing. Nice one. Im quite happy with the result, and the view in its large mirror is phenomenal. A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! Earthbound1 likes this #2 dave brock Mercury-Atlas Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. Robert Brown did an excellent video on how to work out your stepper motor requirements. 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. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. Download and unzip. 5 weeks after I had ordered the mirror, I called to ask about its status. After another 3 weeks, I was concerned that I had not received the mirror. I built a second set of electronics, and I had the NEMA 17 Direct Drive motor left over since it didn't work for my Orion ED80T-CF refractor. I installed the spider first, about one inch down from the end of the square end of the tube. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. I carefully cut exactly through the center of each side bearing circle to make my semicircles. Here's my 8" f/6 travel scope with a 2" PVC draw tube and the helical Crayford focuser built right in the focuser board. After going over the surfaces with a tack cloth to pick up the saw dust, I applied the stain and went over it with cheese cloth rags for an even finish. a try. needle adds no friction that I can feel to the focus action. can't click on it or copy and paste it; it's a graphic file to thwart Perfect for astrophotography or during high power planetary observation. Likewise, the side bearings are made of two identical semicircles of 5/8 inch plywood glued together, creating side bearings that are 1 inches thick. Your design is simple and nice. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. he might just have a $3200 camera, they aren't very hard to come by. Best Wishes, Reply Able to make myself using my own humble tools (or toys as the pros will call them!) In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. I had to take apart the focuser in order to get my bolts in place. ill ask him for a detailed list of what he used and when i get that ill post it here for you. Nice looking telescope. The Focuser and other items: (Scope Stuff). If you're going for simple, have you considered a helical focuser? I used my router to "mill" a flat area for better contact with the focus adjustment rod. Two such companies would not give me a price because the order of a single tube was too small. Save over 40% off the annual cover price for a full year (4 issues) of Make. This unit takes signals from your computer and drives the stepper motor on the focuser. Trim off any unused fabric along the base. The Artemis module works extremely well, and is to be strongly recommended. rod for the drive axle it would have a fairly fine motion. I attached them with very small brads, countersinking the brads. you could probably space the bearings 3/4" apart instead of 1" and mount The motor is much lighter than the geared motor. Place the focuser, draw the position of the screws with a pencil and remove the focuser. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. Some quick tips to note if you are making a homemade telescope are: 1. a "rubbery" feel. The overall project is super cheap, we're building this thing for something like $50 in materials. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, Maker-written books designed to inform and delight! PVC pipe makes great drawtubes. and hope it doesn't fall off Step 3The Side Bearings and Rocker Sides. both sides. The focal length of the mirror is 61 inches. I want to put my 12.5 mirror in a collapsible structure so I can haul it easy, Say a truss tube design, 7 years ago Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. I was certain not to move the jig at all before cutting the second circle. #2 knitting needle would be just about right. The day I received the refund, I ordered a mirror cell from University Optics. i am not trying to win this contest with photos. (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.) 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. 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. 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. It take automatic control of the CCD camera and focuser, and dances around magically on the screen, arriving at perfect focus within about 30s to 3 minutes depending on where you started from. You will need to remove the regular focus knob on your telescope's focuser. Thanks for your article. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. the nylon screws going up from the bottom, but I found the knitting 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. 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. 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. I've been using the above pair on Step 5, 9 years ago forces the knitting needle against the drawtube and the drawtube against The Dob is really a great design. Here is a link to the main FILES area on Robert Brown's site. The cell from Anttler's, for which I had received a refund, had arrived. forward and back along with the drawtube when you focus, and you'll get I had chosen a boxy, rigid design for the binocular scope, so You should now be able to drill the 4 holes at each corner. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches.
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