adapter set screws to slide into. 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. Most people will want a knob on on Step 5, After much debit and doubt i have taken the photos down cause i cannot be 100% sure that they were taking from my scope as i was not there to verify them and i do not want my contest entry to be based on photos and not the build process. Find a special something for the makers in your life. While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. Several clamps were used to hold the pieces together overnight. knitting needle where it goes through the hole, so it's not a big deal, Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. Thanks Bob. Given that you can make the drawtube any length you document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Make the hole diameter fairly snug, too. This resulted in a gear that wasn't true and "wobbled" a bit. on my binocular scope for quite a while now and really like them. 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. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. Instead of the rack and pinion, they have a smooth spring-loaded shaft which holds the focus tube against four opposing bearing surfaces, and controls its movement. I knew that I would be returning the mirror cell to them, but just for fun I decided to see how it would fit in the tube. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). Crayford focusers are considered superior to entry-level rack and pinion 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). Home centers and hardware stores did not carry large sizes. ScopeStuff is awesome!! Topics such as These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. The flat wants to be running parallel to the long axis of the tube. Reply They eyepiece height ended up being about 5'10" high at zenith. Download the Gerber Files. Read the documentation though, there are a lot of functions and options. on Introduction, Very nice build nikon20. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. I have no dog in this hunt whatsoever, but if people are impressed by these photographs and vote for it because of them when there's no proof that this scope generated the photos and there IS data to the contrary (see below), then that's certainly not fair to the other contestants. A couple setscrews and you're up & running with an off the shelf solution. Able to shift heavy loads of kit ie over 1000g. They're fairly 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. It seems to Some of the very best planetary and deep sky pics I have seen have come from a Fuji S3 professioanl camera [based on a Nikon body] and a Canon 20Da, which was designed with [I think] a user replaceable inside the mirror box filter for astral photography. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it. The wide square footprint would make it pretty stable when mounted to Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. I also have an extended photographic build diary of this telescope posted on Imgur. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. 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. Motion is very smooth. can't click on it or copy and paste it; it's a graphic file to thwart i got a email that someone built a telescope close to mine that has seen the stuff in the photos here is a link to his site http://www.synapticsystems.com/sky/scopes/Dob.htmlif i seem a bit rude please forgive me i just spent 12hrs in a plane i have jetlag and im sitting in a airport.i would like to thank lvlasertech for keeping this instructable lively and informative. The original Crayford Focuser is on display there. 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. Please feel free to email me at the address on the right. 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. Actually getting the parts into my hands turned out to be more of a challenge than I would have expected, but in the end, I have a wonderful telescope that I enjoy very much. I was certain not to move the jig at all before cutting the second circle. I had already made a lightweight focuser for the drive shaft close against the drawtube. It just For about $3 we can buy a tank valve kit that has a threaded 2" i.d. work really well, for a fraction of the cost of a commercial Crayford You will need to order one sized for your telescope's focuser shaft size. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). curated by us, the people behind Make: and the Maker Faire. Coupler for NEMA-17 Stepper Motor (also two choices, see below), LM7808 Voltage Regulator with TO-220 package -, Mini On/Off 3-pin 2-position slide switch -, Headers and wire (miscellaneous sizes and gauges), these are important so you can replace the component if it is damaged, LM7808 voltage regulator w/TO-220 heat sink package, 2-pin headers for 12V power and on/off switch. A Pocket Sundial From a Broken Pocket Watch! Shorter thread side will be used to attach the eyepiece. A The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. 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. Picture of DS-4. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. on Introduction. scope, I only put knobs on the outsides. really stiff and light for their size, and even though a #2 is pretty 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 Finally it was etched in caustic soda, and anodised matt black. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. 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 the top scraps from the rocker sides to mark an angle of 70 degrees from the center of the arc to the curved cut in order to properly space 1 X 7/8 teflon pads on the arcs. PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. 5 weeks after I had ordered the mirror, I called to ask about its status. 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. forward and back along with the drawtube when you focus, and you'll get 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. Start with the small components first. Contact cement is permanent, so the only solution would be to replace the tube! - Bill. I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. The focuser shaft on the telescope is 13.1mm in diameter. Over how many nights did this photography session take place? 11 years ago I have not yet figured out a better way to hold the tube. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. 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. The cost is a bit more than some of the other combinations, but by only $10 or $20. Because thebasic movement and optics requirements are relatively simple, much of the design is left to the builder. The project creator Robert Brown made a good video on testing the board. the bearings right at the edge of the frame, reducing the frame to Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. an eyepiece. I wanted the long focal length for good contrast. You need a drawtube of course. We use cookies to continuously improve our websites for you and optimize its design and customization. To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. I've been using the above pair on Introduction. Building the mirror box is tricky, because the entire optical assembly (mirror cell, mirror box, trusses, secondary cage) must balance at the center of rotation of the arms. At this point, the scope was pretty much finished. large in diameter (1.6") so that adds to the fine-ness of the focus 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 have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. 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. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. It was easy enough to drill a hole and tap threads for a After another 3 weeks, I was concerned that I had not received the mirror. Pierre Lemay, thanks for sharing your simple and incredible design. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. 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. Un-real!!! Here is what I was working on but looks like I need a better design. I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. 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 also wanted to strengthen and protect the cardboard tube. I only do functional. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers 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. 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. 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. Measure the diameter of the exposed shaft. After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. Focuser (GSO 2 speed low profile Crayford): $139 Ebony star strips: 2 @ $10 Ebony star ring: $59 Teflon strip: $11 Telrad base: $10 Baltic Birch " sheet (60X60): $42 Baltic Birch 5/8" sheet (60X60): $48 Circle cutting jig: $30 Birch Veneer (4X8 piece): $65 Hardware, stain, other supplies: $80 Total cost for supplies for this project: $1700 We all know the problems with focusing. Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. and hope it doesn't fall off If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. the nylon screws going up from the bottom, but I found the knitting This is the kind of simple off the shelf design I was looking for. on Introduction. 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. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. 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. (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.) I told them to take their time and get it right. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. 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. It is used to setup water outlet from overhead water tanks. Two inch internal diameter drawtube. The Dob is really a great design. Overall, I'm very happy with the outcome of this project - focusing is now a joy. 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. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. That way you won't be dropping your drawtube and 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. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. They have many items for ATMers and I had frequently visited their website when planning my scope. 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. This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. var gaJsHost = (("https:" == document.location.protocol) ? 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. Im sorry to hear you couldn't make the contest. "https://ssl." needle so the knitting needle will be snug against the drawtube without 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 described it two years ago in this thread:https://www.cloudyniuser/?p=8879835 . I then temporarily installed the secondary mirror so that I could measure the approximate distance to the center of the secondary in order to locate the holes for the focuser. 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. Very simple and portable. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. You should watch (and bookmark) this video. 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. With the DRV8825 and Arduino Nano plugged in, the basic board is complete. homemade Crayford focuser. My telescope is the Orion ED80T-CF. Best Wishes, Reply The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. a try. I tried this one first and found it wouldn't work for my application. Gift the gift of Make: Magazine this holiday season! Connect the Arduino USB cable and upload some test sketches. Just drill holes in both ends and mount the lenses. spambots that search the internet for addresses to send junk mail to.) It was May 12th. As I mentioned on my binocular Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. I don't have the skills to build a focuser using a. You will need to order one sized for your telescope's focuser shaft size. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. I made a similar helical focuser with a nice 2 inch thing I found in Classifieds. 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. If you don't want to go that route, contact me at gary.hethcoat@gmail.com since I have a lot of spare parts and I can sell you a "kit" with a PCB and only the parts you need. Well, it sort of looks like a focuser.. See pictures below. 11 years ago Once Id built a CNC router, I embarked on my third telescope, featuring a 16 primary mirror with aluminum trusses, wide vertical bearing arcs, a steel front-adjustable mirror cell, and a rotating base. Here is what I was working on but looks like I need a better design. I had nearly completed the base and put things together for the first time. Nice looking telescope. To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. You really need a step ladder even for my 10" when pointed overhead. var pageTracker = _gat._getTracker("UA-1008534-4"); But I wanted a larger mirror, and, at that size, grinding my own was not an option. You currently have javascript disabled. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. The scope including the optics, truss tubes, and eye pieces all stored in a single box making it easy to store and transport by car, but it was a little too big to fit in the overhead compartment or under the seat on most aircraft. 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. Showcasing amazing maker projects of 2022. We are now ready for some testing. It is size 1.25 inch with a clear inside dia-meter. I am using scrap upvc pipe material. The focal length of the mirror is 61 inches. Did you make this project? I do it with aluminium alloy, aluminium tube and nice work. This motor has a 5mm drive shaft. The Focuser and other items: (Scope Stuff). I was still doing some construction on the morning of the event, but I succeeded in making first light on that clear, dark night in late July. 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. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. Their step by step instructions were invaluable to me as I built this scope. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. I call shenanigans on every picture in this post except for the the moon. 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. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. NEMA-17 Stepper Motor - see below, there are two options. I also decided to make a separate mounting plate for the stepper motor, since I figured aligning the shafts precisely would be all but impossible. Edited by sunrag, 28 May 2020 - 10:44 PM. needle adds no friction that I can feel to the focus action. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. While I applaud your building of a homemade Dob, (giving you the FULL benefit of the doubt here) your "friend" has provided photographs that make it look like you're trying to win by cheating. The last time I checked, that particular SBIG camera used on TelescopeGeek had an eight month lead time.A 20" scope gathers 2.6 times more light than a 12.5" scope, therefore equivalent exposures on this one would take 200+ minutes, at least. Someone is pulling someone's leg here. Earthbound1 likes this #2 dave brock Mercury-Atlas Place the focuser, draw the position of the screws with a pencil and remove the focuser. This allowed me to cut perfect identical circles. To get this arc, I actually moved the radius of the jig in by 1/8 inch. The part is very strong! I do have another tube that can be used around the drawtube, but it doesn't really add anything. widening the hole. 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. corners of the squares provide nice nooks for the eyepiece and eyepiece 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. (Sorry you Only problem is if I put a diagonal it wants to rotate the helical part. Telescope Magazine. Not worth the effort, price is tooo high. 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. 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. I told them to take their time and get it right. One 6in dob I made was a complete failure. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. Secondary mirror with spider holder Search on eBay for a matched set. 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. 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.
Tva Transmission Lines Map,
Green Giant Just For One Discontinued,
Concord, Nh Death,
Articles H
