I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! The Crayford Focuser and DIY Focuser for Homemade Telescope The secondary holder is adjustable, so I could didn't have to get the location perfect. 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. I had the thought that as long as I was going to build it I should build it as big as I could afford. In scaling up the K/B 8 inch design, I made a few changes that, I hope, will improve the design for 12.5 inch aperture. Telescope Focusers | Orion Telescopes: Shop 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. I will get good 30-40 mm focusing range. 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. Not worth the effort, price is tooo high. I file a dispute with Paypal to begin the process of getting my money back. (I didn't have the primary mirror yet). Easy DIY motorized battery free telescope focuser - YouTube The cost is a bit more than some of the other combinations, but by only $10 or $20. A bit of a monster! Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. To make the hole for the focuser, I used the focuser tube to mark a circle in the shroud. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). It is used to setup water outlet from overhead water tanks. This is not recommended for shared computers. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. 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 It took yet another call a week later for the items to actually be mailed. But, like many of you I'm sure, the biggest reason I'm doing this is for the pure geeky fun of it! Crayford-style design with four bearings and one driveshaft. They suggested a construction supply place on the other side of the city that I had not called yet. Cost is $25 - $30, and you will have 5 PCBs in about a week. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. 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. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. Perfect for visual observations with very heavy mirrors. tube and nut that fits the outside threads. Rock on! The Focuser and other items: (Scope Stuff). Measure the diameter of the exposed shaft. Make the hole diameter fairly snug, too. 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. 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. that is a great website that guy has some fantastic photos. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. Our websites use cookies to improve your browsing experience. Download the Gerber Files. This is the first telescope that I have built. Thanks Pinbout for sharing your design. But let me see what items I can arrange to make a helical. DO NOT drill out the holes in the board! Only problem is if I put a diagonal it wants to rotate the helical part. narrow the frame. 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. stronger, but would give me a coarser focus action because of their More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? 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. If not, you may need to design and print your own bracket(s), gears, and so on. 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. A Homemade Crayford Focuser 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. My DIY Motorized Telescope Focuser - YouTube The flat wants to be running parallel to the long axis of the tube. I had already made a lightweight focuser for That way you won't be dropping your drawtube and eyepiece on the ground (or worse, on your primary mirror!) I attached three feet equally spaced on top of the ring, and on the opposite side attached teflon pads 1 X 1 directly above the feet using very small brads and countersinking the brads below the surface of the teflon. It was May 12th. 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. 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. the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. Since there is no drill bit that exactly matches the 13.1mm of the shaft, I had to do some rough enlargement of the hole. This consists of a small black box of electronics. I told them to take their time and get it right. Share it with us! 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. 5 weeks after I had ordered the mirror, I called to ask about its status. It I have not yet figured out a better way to hold the tube. It has a 6mm shaft. 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. on Introduction, Very nice build nikon20. Thanks Bob. Homemade DIY focuser for telescope with computer control - NEUTRAL.org 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. Let me see if I can get similar plumbing parts here. 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. really stiff and light for their size, and even though a #2 is pretty I carefully cut exactly through the center of each side bearing circle to make my semicircles. 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. Not sure if it is available in the USA. My homemade motorized telescope focuser for Celestron C8. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. wobbly knob still works, and adds character. 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. 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. on Introduction. The Dob is really a great design. But, especially on cold evenings, the focus may go out in the middle of the night. Motion is very smooth. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. 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. This makes for better sky photographs as the exposure time can be lengthened,. 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. Homemade Electric Telescope Focuser - Stargazers Lounge drneilmb, thanks for sharing the focuser design. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. 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. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. I'm also going to focus on only one version of Robert's focuser (there are many). The belt and pulleys are off-the-shelf items available on Amazon. 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 applied contact cement to the first inch of the veneer and the mating inch of the tube. 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. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); 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. Upload that main sketch to the Nano. Maker-written books designed to inform and delight! So, as they say, "back to the drawing board". Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. Fast forward a few months to the next time I had the tube outside. 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. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. I don't have the skills to build a focuser using a. Obviously an open truss telescope. You can see that my Moonlite focuser was slightly larger than the sides of the tube. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. 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. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. Electronics and software automate the process of taking pictures. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone.
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