It is size 1.25 inch with a clear inside dia-meter. Here's my 8" f/6 travel scope with a 2" PVC draw tube and the helical Crayford focuser built right in the focuser board. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. accessible by all ages and skill ranges. I have not yet figured out a better way to hold the tube. SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, You won't need to write any sketches from scratch, but you will at least need to figure out how to upload them to the Nano. When I ordered the cell, I paid through paypal, which immediately deducts money from my checking account. on Introduction. Interfaced with a computer, so the computer can make the decisions about where the best focus is. It would cost less and they have a very good reputation. I first tried my 32mm plossl eyepiece. But by this time I had thought about building my own scope for several weeks, and getting one off the shelf seemed pretty boring by comparison! 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. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. At their suggestion, I also ordered a 2.6 inch secondary mirror. "); Pretty dry but important! on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. var gaJsHost = (("https:" == document.location.protocol) ? Coupler for NEMA-17 Stepper Motor (also two choices, see below), LM7808 Voltage Regulator with TO-220 package -, Mini On/Off 3-pin 2-position slide switch -, Headers and wire (miscellaneous sizes and gauges), these are important so you can replace the component if it is damaged, LM7808 voltage regulator w/TO-220 heat sink package, 2-pin headers for 12V power and on/off switch. 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. Finally, attach your polar alignment device and align it with the hinge. The diameter of the focuser is usually indicated in inches. As I understand, you are using it for a refractor. I started by trying to drill out a metal gear for the focuser shaft. 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. 4 years ago Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club, Soft-sensor-saurus | an E-textile Soft Sensor Soft Toy With LED Light. 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. Install on Windows 10, this part is pretty straightforward. And a couple of upright bearing blocks. an inch or so apart, so the focuser body could be pretty low profile. 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. with a genuine question or comment about the design. $299.99 More About Telescope Focusers I have several of the books on building a Dobsonian Telescope. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. I paid the 50% deposit and dreamed of DSOs. The current needs to be adjusted on the DRV8825. Thicker knitting needles would be even Thanks again for the 'ible. Featured in the February, 2015 issue of Sky & The Dob is really a great design. In my build, the minimum eyepiece-to-secondary mirror distance (13) plus the primary-to-secondary mirror distance (57) equals the focal length of 71, which is roughly 4.5 times the width of the 16 mirror. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Focuser (GSO 2 speed low profile Crayford): $139 Ebony star strips: 2 @ $10 Ebony star ring: $59 Teflon strip: $11 Telrad base: $10 Baltic Birch " sheet (60X60): $42 Baltic Birch 5/8" sheet (60X60): $48 Circle cutting jig: $30 Birch Veneer (4X8 piece): $65 Hardware, stain, other supplies: $80 Total cost for supplies for this project: $1700 In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. too far. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); I called in the order and explained that I would be using a mirror two inches thick. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. A project collaboration and documentation platform. case you need more focuser travel than you thought. The day I received the refund, I ordered a mirror cell from University Optics. If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. 7 years ago When you figure out The email bounced back to me. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. Able to shift heavy loads of kit ie over 1000g. Or rather, I hated it. I had already made a lightweight focuser for It interfaces to the computer via USB and comes with an ASCOM driver. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. Yet I was also becoming infected with aperture fever. I didn't receive any confirmation email after a few days, so I tried to send them an email. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. Plus it comes in black, so I applied contact cement to the first inch of the veneer and the mating inch of the tube. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. The extra force will also Edited by sunrag, 28 May 2020 - 10:44 PM. drneilmb, thanks for sharing the focuser design. Just to make sure I liked the stain, I applied some to a piece of scrap wood. 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). Today I purchased what is called atank nipple in India. I had to take apart the focuser in order to get my bolts in place. The focal length of the mirror is 61 inches. 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 used my router to "mill" a flat area for better contact with the focus adjustment rod. I installed the spider first, about one inch down from the end of the square end of the tube. try { The basic points I wanted to cover: What did I end up with? Several clamps were used to hold the pieces together overnight. To view, go here: http://emediadesigns.com/focuser/ Several of my Recent Images have been focused with this system. I also wanted to strengthen and protect the cardboard tube. After another 3 weeks, I was concerned that I had not received the mirror. Homemade astronomy. on my binocular scope for quite a while now and really like them. My homemade motorized telescope focuser for Celestron C8. I've been using the above pair A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. I'm' glad I did, because I didn't like the first color that I had chosen. What materials did you use? tube and nut that fits the outside threads. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. I had chosen a boxy, rigid design for the binocular scope, so I had considered using a clear finish alone, but decided to use a dark red finish on the base and a clear finish on the tube, just because I like the look. 8 years ago You should now be able to drill the 4 holes at each corner. Now attach the screw eyes and the rubber band on the side of the board. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. In addition, we use third-party cookies to help us analyze and understand usage. The last time I checked, that particular SBIG camera used on TelescopeGeek had an eight month lead time.A 20" scope gathers 2.6 times more light than a 12.5" scope, therefore equivalent exposures on this one would take 200+ minutes, at least. Once I decided to build a scope myself I had to decide on the aperture of the scope. 11 years ago Attach the ball head to the top board. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. For a while I decided that 10 inch would be the best size. This motor is available on Amazon. crafts, science & engineering, design, and technology. I had some carboy caps that make good knobs. I wanted the long focal length for good contrast. I do it with aluminium alloy, aluminium tube and nice work. So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. 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. His passion is using CAD design and his homemade CNC router to bring large wood projects to life. widening the hole. 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. pageTracker._trackPageview(); I had considered a Moonlite or Featherlite focuser, but I knew from my experience with my 6 inch scope that I wanted a 2 speed focuser, and the price tag of their 2 speed focusers scared me away.