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. The next day my wife called me at work to tell me a box had arrived with telescope stuff. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. I wanted a tight / press fit, so I only added half that, 0.25mm. I'd together tech enthusiasts, crafters, educators across the globe. In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". So, for my telescope I used a 6mm to 5mm coupler available on Amazon. The overall project is super cheap, we're building this thing for something like $50 in materials. 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. Finally, attach your polar alignment device and align it with the hinge. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. I told them to take their time and get it right. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). I am using scrap upvc pipe material. One of the companies I had considered as a supplier for the primary mirror was Anttler's Optical. Finally it was etched in caustic soda, and anodised matt black. His passion is using CAD design and his homemade CNC router to bring large wood projects to life. A wide hole will let the knitting needle creep But -- you have to be careful that the mechanism is true and the motor does not have a load on it at any time, otherwise it will 'stall' and stop moving. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. 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. Homemade DIY focuser for telescope with computer control - NEUTRAL.org Place the focuser, draw the position of the screws with a pencil and remove the focuser. Most people will want a knob on Shorter thread side will be used to attach the eyepiece. A 6 in primary mirror does not have enough weight to make the dob stable. I marked the spot and moved things back inside to install the mirror. 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. Here is what I was working on but looks like I need a better design. This combination has proved to be effective for all positions except when the tube is pointed directly up. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. Not sure if it is available in the USA. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. 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. on Step 1, Richards in our local astronomy club. Thicker knitting needles would be even I made this Crayford style focuser using plywood scraps and surplus bearings. We are now ready for some testing. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. astronowanabe, Pierre Lemay, LarsMalmgren and. Then it was time to stain and finish. Here are a few photos of the "bracket", which is a simple 3D printed plate that mounts to the telescope's focuser ring, and serves as a mount for the stepper motor. (actually, it ended up a smidge more than 2 inches). Homemade 12.5 Inch Dobsonian Telescope - Instructables I have not yet figured out a better way to hold the tube. adapter set screws to slide into. Just as it was about to come into focus, the focuser bottomed out. How to make diy focuser pvc - YouTube 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. Obviously an open truss telescope. The glue should keep the nylon from fraying. I used one of these scrap pieces to draw an angle of 70 degrees to the edge of the arc so that I could later place the teflon pads on the arcs. crafts, science & engineering, design, and technology. 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. Attach the ball head to the top board. he might just have a $3200 camera, they aren't very hard to come by. I have several of the books on building a Dobsonian Telescope. on Introduction. 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. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. Pretty dry but important! I found a used 16 primary on eBay. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? I did not glue the bearings to the tube box in case I needed to adjust the position later. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. 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. 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. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. You should now be able to drill the 4 holes at each corner. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. Once I decided to build a scope myself I had to decide on the aperture of the scope. The base of the telescope should be a wide, sturdy square or circle of wood with teflon bearing pads matched to the ABS plastic ring of the rocker box. And, once your telescope is finished, be sure to join a local astronomy club to learn more about the sky and share your hobby with others. Another vote for Pierre's helical Crayford design. curated by us, the people behind Make: and the Maker Faire. Low, or Zero slop when changing direction. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. I used my router to "mill" a flat area for better contact with the focus adjustment rod. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. can't click on it or copy and paste it; it's a graphic file to thwart i am not trying to win this contest with photos. Drill the holes for the knitting Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). 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. I do have another tube that can be used around the drawtube, but it doesn't really add anything. Easy DIY motorized battery free telescope focuser - YouTube that is a great website that guy has some fantastic photos. This might have been tempting if I wanted to build a 6 inch scopeat that size, they say that first-timers do pretty well at grinding and figuring their own optics. Plus it comes in black, so Overall, I'm very happy with the outcome of this project - focusing is now a joy. 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. 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. The motor is much lighter than the geared motor. I called in the order and explained that I would be using a mirror two inches thick. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. See captioned photos 22-25 here:https://www.cloudyniractor-focuser/ for more detail on building a flush valve focuser, as Bob mentions. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. I set things up in daylight and collimated the scope. } 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. once. Please feel free to email me at the address on the right. The focal length of the mirror is 61 inches. 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. Knitting needles are 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. Orient this assembly to allow you to view an object on the far horizon. There are sub-folders for the different versions. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. 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.) Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. So I was looking for a cheap, light-but-sturdy design for a
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