11 years ago spambots that search the internet for addresses to send junk mail to.) Perfect for visual observations with very heavy mirrors. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. I would love to see your build when you are finished with it . 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. I got a different stain, tested it, and went back to work. PVC pipe makes great drawtubes. It stalled when tension on the belt increased. For my project I needed a 14 inch diameter, and I had a tough time finding one. Knitting needles are my 12.5" trackball, but I didn't : "http://www. You will need to remove the regular focus knob on your telescope's focuser. Many sources point out that 10 inches is a kind of sweet spot in the balance between power and portability. Use mild soap and distilled . If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. #@$%^#@!!!!! Place the focuser, draw the position of the screws with a pencil and remove the focuser. The next day my wife called me at work to tell me a box had arrived with telescope stuff. 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. DO NOT drill out the holes in the board! While round tubing is sturdy, square tubing is easier to work with. 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. I want to make this direct drive system work. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! That helps with low-profile This is the kind of simple off the shelf design I was looking for. 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. I carefully cut exactly through the center of each side bearing circle to make my semicircles. I took the whole tube assembly outside. I do have another tube that can be used around the drawtube, but it doesn't really add anything. I only use the OTA. It took a lot longer than I expected to receive my mirror and other parts from Discovery. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. Maker-written books designed to inform and delight! Picture of DS-4. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. Now I can simply insert the PVC cap on the end of a 4" pvc tube. My guess is that photo was taken with a refractor. You need some purple bits I had designed the tube box so that there would be an extra inch around the tube. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. "); They're fairly This is the upper tube that contains the flat secondary mirror, Telrad finder, and focuser. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . I plan to use an FTA over it in case an extension is needed. crafts, science & engineering, design, and technology. Also no obvious diffraction spikes in the m31 photo. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. the drive shaft close against the drawtube. . And a flat thing to put it all on Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. Your design is simple and nice. 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. Electronics and software automate the process of taking pictures. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. 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. I am well versed in technology, have all the tools necessary to build my own! 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 also have an extended photographic build diary of this telescope posted on Imgur. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. DIY Truss Dob input: How to design truss? Just to make sure I liked the stain, I applied some to a piece of scrap wood. tube and nut that fits the outside threads. Telescope Magazine. eyepiece on the ground (or worse, on your primary mirror!) 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 focuser. I had installed the mirror about an inch too far away from the focuser. Finally it was etched in caustic soda, and anodised matt black. I had to take apart the focuser in order to get my bolts in place. After another 3 weeks, I was concerned that I had not received the mirror. This motor has a 5mm drive shaft. To test the concept I used a short piece of two inch PVC for the draw tube. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. Connect the Arduino USB cable and upload some test sketches. 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. A Pocket Sundial From a Broken Pocket Watch! ill ask him for a detailed list of what he used and when i get that ill post it here for you. 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. Cost is $25 - $30, and you will have 5 PCBs in about a week. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. I had already made a lightweight focuser for The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). After the second call, I received a response that it would be ready at the end of the following week. 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. 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. 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. 5 weeks after I had ordered the mirror, I called to ask about its status. I Here is a link to the main FILES area on Robert Brown's site. The plate has slotted screw holes for tensioning the 6mm belt. Find a special something for the makers in your life. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. 10 inch or 12 inch. Depending on your telescope, one of the Brackets that Robert has may work for you. 5 weeks after I had ordered the mirror, I called to ask about its status. It is used to setup water outlet from overhead water tanks. larger diameter. the nylon screws going up from the bottom, but I found the knitting Edited by howardcano, 24 May 2020 - 09:29 PM. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . His project is very well documented. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. A project collaboration and documentation platform. (actually, it ended up a smidge more than 2 inches). 1" Rack & Pinion Focuser. my thoughts naturally gravitated toward a boxy focuser to go with it. It is not very powerful, it will not supply enough torque if you put any load on it or have a heavy optical train (like I do) and the focuser has to "pull" it upward when the telescope is vertical. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. 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. Not sure if it is available in the USA. 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 had some carboy caps that make good knobs. 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. (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.) Step 4Attaching the Side Bearings and assembling the Rocker. 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. I set things up in daylight and collimated the scope. The secondary holder is adjustable, so I could didn't have to get the location perfect. 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.
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