Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. Along with some silver bits 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. Orion Telescope Focusers | Buy Direct and Save! pageTracker._trackPageview(); The length of the Rocker Front also had to be changed so that the outside edge of the Side Bearings matched the outside edge of the Rocker Sides precisely. This motor has a larger shaft diameter (8mm) and is quite a bit heavier overall than the direct drive motor, mainly because of the gearbox. You can view and download the full file here. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. It was May 12th. We use cookies to continuously improve our websites for you and optimize its design and customization. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. I used a hole saw to cut a wooden plug to fit inside the It was important that the two circles be identical because the edges had to match perfectly when glued together and the two side bearings had to be identical in order for the altitude motion to work well. Thicker knitting needles would be even I set things up in daylight and collimated the scope. Orient this assembly to allow you to view an object on the far horizon. 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. 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. As I read the book I decided that I should build a 12.5 inch truss tube scope. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. I don't have the skills to build a focuser using a. A 6 in primary mirror does not have enough weight to make the dob stable. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more help eliminate slippage when the focuser is pointed straight upward. adapter set screws to slide into. And bolt to scope This will determine the size of the coupler you will use to connect the stepper motor. I do it with aluminium alloy, aluminium tube and nice work. My other telescope is a Celestron NexStar C6E. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. Next, attach the eyepiece and the focuser to the top part of the telescope tube. This is my copy of the telescope that Sir Isaac Newton presented to the Royal Society of London in 1671, and is considered to be the first successful reflecting telescope. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. That way you won't be dropping your drawtube and This focuser (see pic at bottom) was motorised by me several years ago, but the motorised system didn't give me very fine control, and the motor running at fast speed tended to make the Artemis camera crash. Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, PCB (printed circuit board) - download the, DRV8825 - stepper motor driver chip/board - again, clones available on. Over how many nights did this photography session take place? Slide the eyepiece into the focuser and try it out. 4 years ago The bearings only need to be (actually, it ended up a smidge more than 2 inches). Thanks Peter. The secondary holder is adjustable, so I could didn't have to get the location perfect. If not, you may need to design and print your own bracket(s), gears, and so on. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. I don't have the skills to build a focuser using a. You need to order it sized for your focuser shaft size. And a flat thing to put it all on Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. weight. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. I suspected that the company was either in trouble or no longer in business. larger diameter. 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. 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. like, you can have as much focuser travel as you want no matter how To get this arc, I actually moved the radius of the jig, At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. I wanted to wrap the tube in veneer because I had seen a homemade telescope on a website that used veneer and I liked the look. knob, and a drill press to make sure the hole for the knitting needle The bigger upvc nut will be attached to focuser plate and longer threaded side will be used on it for the focusing. Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. A project collaboration and documentation platform. I told them I was on my way. I redrilled the holes for the mirror cell and got ready to wrap it. Homage to Homemade Crayford Focusers - Cloudy Nights 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. It was easy enough to drill a hole and tap threads for a Building a Homemade Telescope Eyepiece - HubPages So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. . focuser. I attached them with very small brads, countersinking the brads. 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. Able to make myself using my own humble tools (or toys as the pros will call them!) After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. Not sure if it is available in the USA. Be creative! $299.99 More About Telescope Focusers 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. 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. As the telescope tilts toward the horizon, the mirror must be supported on its edge. I ground and figured the mirror with little troubles, making my focault tester, etc. Many sources point out that 10 inches is a kind of sweet spot in the balance between power and portability. Install on Windows 10, this part is pretty straightforward. 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. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. on Introduction. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. 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. exactly 2" with adhesive labels placed one at a time inside the tube Primary telescope mirror aftermarket, homemade, or custom-made. Shorter thread side will be used to attach the eyepiece. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. Well, it sort of looks like a focuser.. See pictures below. These will be stored in your browser only with your consent and you have the option to opt-out. 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. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. Just drill holes in both ends and mount the lenses. It is used to setup water outlet from overhead water tanks. Connect the Arduino USB cable and upload some test sketches. love to hear from people who are interested in this focuser design. 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. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). 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. work really well, for a fraction of the cost of a commercial Crayford Plus it comes in black, so For my project I needed a 14 inch diameter, and I had a tough time finding one. 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. I hate focusing. Electronics and software automate the process of taking pictures. This motor has a 5mm drive shaft.

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