Unfortunately I don't have a 3d printer. DIY Truss Dob input: How to design truss? Download the Gerber Files. It stalled when tension on the belt increased. There are sub-folders for the different versions. I also have an extended photographic build diary of this telescope posted on Imgur. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. 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. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. My guess is that photo was taken with a refractor. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. 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. 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.) It seems to Best Wishes, Reply It interfaces to the computer via USB and comes with an ASCOM driver. Someone is pulling someone's leg here. But I wanted a larger mirror, and, at that size, grinding my own was not an option. Earthbound1 likes this #2 dave brock Mercury-Atlas 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. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. Read the documentation though, there are a lot of functions and options. Several of my Recent Images have been focused with this system. I could not find a spacer to fit my 9/16 hole, so I bought the 11/16 spacer (1 1/8 long because that's what the store had) and a bit of the same size. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. I laughed, packed up the cell with a long letter describing the series of events that led to the return, and put it in the mail. For my project I needed a 14 inch diameter, and I had a tough time finding one. 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. SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. 5 weeks after I had ordered the mirror, I called to ask about its status. This combination has proved to be effective for all positions except when the tube is pointed directly up. on Introduction, Very nice build nikon20. 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. Pretty dry but important! 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. Nice one. Let me see if I am able to collect all the parts needed. The mount and tripod are pretty much useless for astrophotography. They suggested a construction supply place on the other side of the city that I had not called yet. To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. 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. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. Slide the eyepiece into the focuser and try it out. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. After a dry fit of the rocker to make sure that the tube box with side bearings would fit well, I glued the rocker sides to the rocker front, holding them in place with small nails and clamping overnight. 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). The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. We are now ready for some testing. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. was straight so I wouldn't get a wobbly knob. Share it with us! The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. 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. 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. Those are the last screws to be tightened. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. occurred to me that a square turned 45 degrees would give me two flat 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. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. the interior diameter is just a nudge over 2". What materials did you use? A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! It has a 6mm shaft. 10 years ago The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. 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 don't have the skills to build a focuser using a. 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. The curved sides of the Side Bearings are also covered with strips of Ebony Star that glide on the teflon pads on the curved edges of the Rocker Sides (figure 3). } catch(err) {}, SH-232 Sharpless sh-232, sh-231, sh-233, sh-235, NGC2174 Monkey Head Nebula, Sharpless 252, Sh2-252, HDW3 Hartl-Dengel-Weinberger 3 PN G149.4-09.2, SH-198 Sharpless 198, Soul Nebula, IC1848, NGC281 IC11, Sharpless Sh2-184, Pacman Nebula, SH2-173 SH2-173 Phantom of the Opera LBN 593, SH2-168 Sharpless HII regions. To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co. Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. Reply It doesn't. A tilted focuser will have no effect on the image quality. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. I sourced my own Stepper motor and 1:150 reduction gearbox from RS, who are just up the road. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. 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. 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. This allowed me to cut perfect identical circles. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. And a couple of upright bearing blocks. The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. The original Crayford Focuser is on display there. Only problem is if I put a diagonal it wants to rotate the helical part. 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. A That way you won't be dropping your drawtube and astronowanabe, Pierre Lemay, LarsMalmgren and. I made this Crayford style focuser using plywood scraps and surplus bearings. This software creates a model of your telescope by measuring out of focus star sizes at various points. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. an eyepiece. 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. Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. But, especially on cold evenings, the focus may go out in the middle of the night. you could probably space the bearings 3/4" apart instead of 1" and mount This makes for better sky photographs as the exposure time can be lengthened,. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. Very simple and portable. The lumber yard also gave me a lower price than I expected. on Introduction. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. And bolt to scope NEMA-17 Stepper Motor - see below, there are two options. I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. 11 years ago I ended up modifying it a bit after printing. 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. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. think that design would be rigid enough under the weight of a diagonal I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. I will get good 30-40 mm focusing range. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. Orion Dynamo Mini for powering a Nexstar 6SE? needle adds no friction that I can feel to the focus action. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. I had chosen a boxy, rigid design for the binocular scope, so I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. With the DRV8825 and Arduino Nano plugged in, the basic board is complete. Connect the Arduino USB cable and upload some test sketches. can't click on it or copy and paste it; it's a graphic file to thwart But, like many of you I'm sure, the biggest reason I'm doing this is for the pure geeky fun of it! In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. Orient this assembly to allow you to view an object on the far horizon. 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. As I understand, you are using it for a refractor. Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. It is size 1.25 inch with a clear inside dia-meter. #2 knitting needle would be just about right. Share a cool tool or product with the community. once. installations. LVLaserTech is right please do not vote for the pictures my instructable is for the build of the telescope not the quality of the photos.and as i said before i was not there is there a possibility that he sent me the wrong photos sure is there a possibility that he used a different mount than the one i saw sure is there a possibility that he is lying to me me about what he did sure. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. 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. 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. Overall, I'm very happy with the outcome of this project - focusing is now a joy. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. If you're not using heavy eyepieces, you probably don't need too far. My other telescope is a Celestron NexStar C6E. CNC files (optional) Download the Sketchup files. It would cost less and they have a very good reputation. 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. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. Start with the small components first. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. Knitting needles are work really well, for a fraction of the cost of a commercial Crayford The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. and hope it doesn't fall off You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. 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. I did not wrap the tube until I had completed the base. This cost around $100 to build and all of the components came from. 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. 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. You need some purple bits Save over 40% off the annual cover price for a full year (4 issues) of Make. We then spread contact cement over the remaining veneer and tube surface, waited for the glue to dry, and carefully rolled the tube over the veneer. After another 3 weeks, I was concerned that I had not received the mirror. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. If you follow the procedures described above, your telescope's optics will be perfectly aligned. All that remained was to design and print a bracket, and buy the needed parts. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. They said they would make the brackets extra long to accommodate the mirror and it would take about a week. Home centers and hardware stores did not carry large sizes. Thanks for your article. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. Several functions may not work. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. I call shenanigans on every picture in this post except for the the moon. In order for the Rocker Box to pivot on the Ground Board, a center pin is placed in a hole at the exact center of the Ground Board and Rocker Bottom. Here is what I was working on but looks like I need a better design. The next day my wife called me at work to tell me a box had arrived with telescope stuff. On the cutting diagram, you can see that the side bearings were cut 26 inches long. 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. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. The day I received the refund, I ordered a mirror cell from University Optics. Please re-enable javascript to access full functionality. Edited by sunrag, 28 May 2020 - 10:44 PM. I then attached the Ebony Star ring using contact cement. 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. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. I My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. A project collaboration and documentation platform. 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. drneilmb, thanks for sharing the focuser design. Did you make this project? with a genuine question or comment about the design. an inch or so apart, so the focuser body could be pretty low profile. The overall project is super cheap, we're building this thing for something like $50 in materials. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . Along with some silver bits 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. I have several of the books on building a Dobsonian Telescope. curated by us, the people behind Make: and the Maker Faire. I'll use an aluminum tube for the finished draw tube but for now the plastic tube . Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. Share it with us! Most of these have one or two set screws. on Step 1, Richards in our local astronomy club. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. I am well versed in technology, have all the tools necessary to build my own! To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. I read the entire thread and surely its going to help me building my focuser. the nylon screws going up from the bottom, but I found the knitting 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. I redrilled the holes for the mirror cell and got ready to wrap it. The version number "312" here may change if Robert posts new firmware. larger diameter. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. Two such companies would not give me a price because the order of a single tube was too small. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . 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. I carefully cut exactly through the center of each side bearing circle to make my semicircles. narrow the frame. Most people will want a knob on var pageTracker = _gat._getTracker("UA-1008534-4"); This is where you will use screws to strongly attach the focuser onto the tube. Attach the ball head to the top board. Step 4Attaching the Side Bearings and assembling the Rocker. ill ask him for a detailed list of what he used and when i get that ill post it here for you. Thanks Peter. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more Make an account on JLCPCB.com, upload the Gerber zip file, that's it! A Pocket Sundial From a Broken Pocket Watch! These will be stored in your browser only with your consent and you have the option to opt-out. Perfect for visual observations with very heavy mirrors. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). 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. 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. I am a retired USAF electronics engineer, and might even do much of the construction of the base with welded structural tubing, as, I do have a complete metal working shop besides my wood shop, here. Crayford-style design with four bearings and one driveshaft. Install on Windows 10, this part is pretty straightforward. $299.99 More About Telescope Focusers 7 years ago really stiff and light for their size, and even though a #2 is pretty I really had to, since the underside of my telescope's focuser is all curves, no flat area for attaching the mounting bracket. A couple setscrews and you're up & running with an off the shelf solution. Motion is very smooth. If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. together tech enthusiasts, crafters, educators across the globe. This will determine the size of the coupler you will use to connect the stepper motor. I only use the OTA. needle so the knitting needle will be snug against the drawtube without This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. My homemade motorized telescope focuser for Celestron C8. The telescopes size is classified by the size of its mirror. The little app is simple and works great. 8 years ago the bearings, totally eliminating any flex. As the thread shows you could also build the dual speed version, all made of plywood, if you feel ready to tackle a slightly more complex project for a cost of about 5$ more. If you wanted to really go low-profile with this design, 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. the side of a rigid secondary cage. haven't yet found any design elements that need improvement. Thanks for the great comment. 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. PhotoPictureResizer_190723_214534574_crop_2558x3105_copy_1023x1242.jpg. Be creative! Maker-written books designed to inform and delight! Today I purchased what is called atank nipple in India. 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. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. 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! 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 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. 11 years ago I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. I suspected that the company was either in trouble or no longer in business.

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