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.". Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. It has become an indispensable piece of equipment for me that so beats hacking and filing PVC pipes etc. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. 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. 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 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'll use an aluminum tube for the finished draw tube but for now the plastic tube . A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! I read the entire thread and surely its going to help me building my focuser. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. spambots that search the internet for addresses to send junk mail to.) 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. Several of my Recent Images have been focused with this system. I ended up modifying it a bit after printing. Yet I was also becoming infected with aperture fever. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); an inch or so apart, so the focuser body could be pretty low profile. a "rubbery" feel. 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. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . Get hands-on with kits, books, and more from the Maker Shed, Skill builder, project tutorials, and more. The last chapter of the book describes a plan for an 8 inch sonotube dob with a few design elements from their truss design, and, as I read that chapter, the simplicity of its construction was very appealing. New Creation Tamil 6.96K subscribers Welcome to New Creation Tamil Our Channel include of Guiding Videos: 1.DIY Projects 2.Awesome Ideas 3.Tips You are inter with New Creation Tamil you can enjoy. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. For my project I needed a 14 inch diameter, and I had a tough time finding one. This is the first telescope that I have built. Share it with us! Until I see photos of this scope setup for these pictures and an explanation of the exact equipment used, I cannot believe that these pictures were taken with this OTA. "); The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. $299.99 More About Telescope Focusers microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. on Step 1, Richards in our local astronomy club. It doesn't. A tilted focuser will have no effect on the image quality. surfaces to put the bearings in and a vee at the bottom that would hold The next day, I centered the rocker on the rocker bottom (which had been cut using the same method as the side bearing circles), drawing perpendicular lines through the center of the rocker bottom to use as a guide, and tracing the position on the rocker bottom. A 6 in primary mirror does not have enough weight to make the dob stable. Featured in the February, 2015 issue of Sky & I Hope to give you ideas if you are thinking about building one for yourself! 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. homemade Crayford focuser. control. 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. crafts, science & engineering, design, and technology. Participated in the Celestron Space Challenge. The wood would cost the same, as would pretty much everything except the mirror, so why not spend a little more on the mirror and go BIG. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. I'm only hoping to supplement it a bit with some info and pictures aimed at those with limited skills (such as myself) :-) I'm not an electrical engineer, I'm more of a software guy with some limited knowledge of electronics and basic soldering and assembly skills. To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. you don't need to paint it (or worry about paint flaking off it). 10 years ago 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. ASIAIR - Is there an easy way to load Messier catalog into Autorun? The 2-1.25" adapter is a sink drain slip fitting in 1-1/4" size that slips into the large tube for 1.25 EP's. 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 had chosen a boxy, rigid design for the binocular scope, so Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. on Introduction, Very nice build nikon20. If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. Today I purchased what is called atank nipple in India. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. I had cut the 12 foot tube in half in order to get it home in the first place, and a 6 foot section was the right size to work with for my f/5 12.5 inch. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. 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. I 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 Before attaching the sides and front to the bottom with wood screws, I wanted to make sure those screws would not interfere with the Ebony Star ring that would be attached to the rocker bottom. Fairly easy to build and could be adapted to suit any SCT focuser. (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.) Once I had my design set, I was ready to buy the parts. My other telescope is a Celestron NexStar C6E. can't click on it or copy and paste it; it's a graphic file to thwart 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. Attach the ball head to the top board. Im quite happy with the result, and the view in its large mirror is phenomenal. Part numbers 351-4574 and 336-422. 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. Please re-enable javascript to access full functionality. I'm' glad I did, because I didn't like the first color that I had chosen. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. This means I can use FocusMax to do the focusing. The kit just contains the electronics - it is up to the user to find a stepper motor and attach it to their own telescope focuser. Perfect for visual observations with very heavy mirrors. PVC pipe makes great drawtubes. I installed the spider first, about one inch down from the end of the square end of the tube. Please feel free to email me at the address on the right. All in all it seemed like a pretty robust design, so I gave it knob, and a drill press to make sure the hole for the knitting needle Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. That helps with low-profile 11 years ago DIY Truss Dob input: How to design truss? flexing. Cost is $25 - $30, and you will have 5 PCBs in about a week. So I was looking for a cheap, light-but-sturdy design for a eyepiece on the ground (or worse, on your primary mirror!) 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. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. I don't have the skills to build a focuser using a. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. But, especially on cold evenings, the focus may go out in the middle of the night. I welded mine from steel square tubing. Nice work and great instructable! Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. needle to be just a little too flexible for the weight of a diagonal and 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. Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. Other supplies that I bought for this project include wood, various bits of hardware, stain and finishing supplies, and a circle cutting jig for a router. 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. "https://ssl." Along with some silver bits At their suggestion, I also ordered a 2.6 inch secondary mirror. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. Obviously an open truss telescope. Share it with us! A week after they said they would send the secondary and other parts, I called to ask if things had been sent. This scope was originally made as a travel scope using an eight inch mirror that I ground and polished at the St Pete Astronomy Clubs Mirror Lab. It seems to The overall project is super cheap, we're building this thing for something like $50 in materials. 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. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. Un-real!!! I don't *do* pretty. I have not yet figured out a better way to hold the tube. Their step by step instructions were invaluable to me as I built this scope. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. curated by us, the people behind Make: and the Maker Faire. Several functions may not work. Have you made any mods on it since you built it? This consists of a small black box of electronics. 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. Thanks for your article. The Dob is really a great design. Membership connects and supports the people and projects that shape our future and supports the learning Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. This arrangement turns 100% true, no wobble. 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. Here is what I was working on but looks like I need a better design. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. on my binocular scope for quite a while now and really like them. You will look through these as you rotate the wheel. I decided that my best option was to scale up their 8 inch design for a 12.5 inch scope and sacrifice the portability and easier storage of a truss scope for something that I felt confident in building myself. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. the side of a rigid secondary cage. If you're going for simple, have you considered a helical focuser? exactly 2" with adhesive labels placed one at a time inside the tube Gift the gift of Make: Magazine this holiday season! Finally, I glued a strip of Ebony Star laminante to the curves edge of each side bearing using contact cement, using a flush edge bit on a router to bring the edge of the laminate even with the edge of the wood after the cement had set. In amateur astrophotography, we run our telescopes overnight. Home centers and hardware stores did not carry large sizes. I ground and figured the mirror with little troubles, making my focault tester, etc. When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. Be creative! I centered the focuser 8 inches from the top of the tube, using a 2.5 inch hole drilling saw with smaller holes for the bolts that would hold the focuser. 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. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. weight. Share a cool tool or product with the community. Download and check them out, I just grabbed the first one and printed it. 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. There are sub-folders for the different versions. Primary telescope mirror aftermarket, homemade, or custom-made. 1" Rack & Pinion Focuser. Our websites use cookies to improve your browsing experience. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! The cutting diagram in (figure 1) shows how I cut the required pieces from two 60 X 60 pieces of Baltic Birch plywood, one inch thick, and one 5/8. corners of the squares provide nice nooks for the eyepiece and eyepiece like, you can have as much focuser travel as you want no matter how Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts. Having an RS trade counter 2 miles away is such a luxury! The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. large in diameter (1.6") so that adds to the fine-ness of the focus 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. haven't yet found any design elements that need improvement. 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. Now attach the screw eyes and the rubber band on the side of the board. By adjusting the bolts, the mirror can be pointed toward the correct spot. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. tube and nut that fits the outside threads. 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. The belt and pulleys are off-the-shelf items available on Amazon. 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. astronowanabe, Pierre Lemay, LarsMalmgren and. I have several of the books on building a Dobsonian Telescope. You need a drawtube of course. (actually, it ended up a smidge more than 2 inches). What materials did you use? love to hear from people who are interested in this focuser design. How to build a 12.5 inch closed tube Dobsonian telescope. Depending on your telescope, one of the Brackets that Robert has may work for you. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. forces the knitting needle against the drawtube and the drawtube against It interfaces to the computer via USB and comes with an ASCOM driver. Deep space photos like these require HOURS of exposure for each one. I was certain not to move the jig at all before cutting the second circle. focusers for that project. 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. was straight so I wouldn't get a wobbly knob. After another 3 weeks, I was concerned that I had not received the mirror. In addition, we use third-party cookies to help us analyze and understand usage. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. Bill, Impressive work and great idea about LSDF focuser. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. Finally it was etched in caustic soda, and anodised matt black. The plastic will ride on teflon pads, creating just enough traction for the telescope to avoid sliding on its own while not making it too difficult to point at things in the sky. One 6in dob I made was a complete failure. Install on Windows 10, this part is pretty straightforward. 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. Or rather, I hated it. once. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). I feel it is a wonderful thing to free oneself from the "store-bought" world, as Tombaugh did, and to use your imagination and skills to develop your own, personal way of viewing the sky. 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. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. Place the focuser, draw the position of the screws with a pencil and remove the focuser. rod for the drive axle it would have a fairly fine motion. They suggested a construction supply place on the other side of the city that I had not called yet. I had some carboy caps that make good knobs. var pageTracker = _gat._getTracker("UA-1008534-4"); Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. I wanted the long focal length for good contrast. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. Crayford-style design with four bearings and one driveshaft. It took yet another call a week later for the items to actually be mailed. Rock on! My homemade motorized telescope focuser for Celestron C8. Next, attach the eyepiece and the focuser to the top part of the telescope tube. 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. Given that you can make the drawtube any length you Thank you for your pages. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. Crayford-style design with four bearings and one driveshaft. I think I got what I wanted and seems best solution for me. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Find a special something for the makers in your life. It's the same in form, but has a perfect, true 13.35mm hole. I'd Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. I do have another tube that can be used around the drawtube, but it doesn't really add anything. 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 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. Let me see if I am able to collect all the parts needed. In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". 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. on Step 5. Since these focusers were going side-by-side on a binocular An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Thanks Peter. 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. After you've done that, put a couple of tiny pan-head screws Save over 40% off the annual cover price for a full year (4 issues) of Make. The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. 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. A Pocket Sundial From a Broken Pocket Watch! 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 used the "LEDandBuzzer" and "TestStepsDRV8825" tests. We use cookies to continuously improve our websites for you and optimize its design and customization. A bit of a monster! Robert Brown did an excellent video on how to work out your stepper motor requirements. Well, it sort of looks like a focuser.. See pictures below.
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