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. Once Id built a CNC router, I embarked on my third telescope, featuring a 16 primary mirror with aluminum trusses, wide vertical bearing arcs, a steel front-adjustable mirror cell, and a rotating base. The diameter of the focuser is usually indicated in inches. widening the hole. (Sorry you My homemade motorized telescope focuser for Celestron C8. As I understand, you are using it for a refractor. (actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. I file a dispute with Paypal to begin the process of getting my money back. stronger, but would give me a coarser focus action because of their I wasn't there so i can be 100% but i do not think my friend was lying to me and i believe the pictures are from my telescope my kids use it for stargazing a lot i have seen some deepspace but i use it mainly for sketching the moon and i like to view solar flares. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. in the tube so they'll hit the knitting needle before your drawtube runs We use cookies to continuously improve our websites for you and optimize its design and customization. Thanks Pinbout for sharing your design. Crayford-style design with four bearings and one driveshaft. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. The belt and pulleys are off-the-shelf items available on Amazon. Edited by howardcano, 24 May 2020 - 09:29 PM. I have built a homemade electric focuser for my Celestron 8SE using a radio control hobby servo and some spare parts. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. 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. 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. Secondary mirror with spider holder Search on eBay for a matched set. Once built, line the undersides of the arms with textured ABS plastic as a bearing surface. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. It take automatic control of the CCD camera and focuser, and dances around magically on the screen, arriving at perfect focus within about 30s to 3 minutes depending on where you started from. 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 Now I can simply insert the PVC cap on the end of a 4" pvc tube. The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. 5 weeks after I had ordered the mirror, I called to ask about its status. 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. Two such companies would not give me a price because the order of a single tube was too small. It may need some careful coaxing with a screwdriver. That is dirt cheap compared to the cost of commercially available focusers, which can top $1000 and are much heavier than what we will build. Trim off any unused fabric along the base. the interior diameter is just a nudge over 2". My other telescope is a Celestron NexStar C6E. Thanks for your article. 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. 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. 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. weight. You need to order it sized for your focuser shaft size. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. Now attach the screw eyes and the rubber band on the side of the board. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! If you follow the procedures described above, your telescope's optics will be perfectly aligned. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. They have many items for ATMers and I had frequently visited their website when planning my scope. I am using scrap upvc pipe material. If you want a Crayford focuser with a knob instead of turning the draw tube, then Jerry Oltion's designhttp://www.jerryoltixycrayfords.htm using box frames and knitting needle drive shafts is also a fairly easy build. Drill the holes for the knitting Just drill holes in both ends and mount the lenses. I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). Able to shift heavy loads of kit ie over 1000g. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. My concern turned to alarm when my wife told me that Discovery had charged the balance due on all items to my account a few weeks earlier. The mount and tripod are pretty much useless for astrophotography. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. 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. Only problem is if I put a diagonal it wants to rotate the helical part. A Pocket Sundial From a Broken Pocket Watch! If not, you may need to design and print your own bracket(s), gears, and so on.
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. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. (A badly tilted focuser may subtly alter the illumination pattern of the focal plane to a degree that would be impossible to perceive visually but that's about it.) Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . 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.) This motor is available on Amazon. To get this arc, I actually moved the radius of the jig in by 1/8 inch. 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. It interfaces to the computer via USB and comes with an ASCOM driver. The email bounced back to me. 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. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories,
Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. I got no response to phone calls or emails after another week, and decided to wait until the primary would be finished in another two weeks. Both cameras have fairly small megapixels by todays' standards, and are certainly obsolete, but do the job extremely well! Some of the very best planetary and deep sky pics I have seen have come from a Fuji S3 professioanl camera [based on a Nikon body] and a Canon 20Da, which was designed with [I think] a user replaceable inside the mirror box filter for astral photography. Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. installations. 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 motor is much lighter than the geared motor. You will look through these as you rotate the wheel. the nylon screws going up from the bottom, but I found the knitting The lumber yard also gave me a lower price than I expected. A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! 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. 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! Once I decided to build a scope myself I had to decide on the aperture of the scope. The cell from Anttler's, for which I had received a refund, had arrived.
With Simple, Homemade Telescopes, You Can Explore the Stars (Op-Ed) The mirror cell: University Optics (eventually). The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. it sticks into your light path. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. I Hope to give you ideas if you are thinking about building one for yourself! Look down through the empty focuser. 10 years ago Community Forum Software by IP.BoardLicensed to: Cloudy Nights. I only do functional. A Pocket Sundial From a Broken Pocket Watch! The pivot bolt consists of a 1 1/8 inch brass spacer with an 11/16 inch outer diameter, a 3/8 inch bolt 2 inches long, a stop nut, and two large washers. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. Page 1 of 2 - DIY focuser design - posted in ATM, Optics and DIY Forum: Hi I am working on a diy focuser design for my 6 F/8 telescope and asking suggestions for simple focuser. If you mess up, you can turn the hole into a slot, but avoid on Introduction. and an eyepiece. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. 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. needle so the knitting needle will be snug against the drawtube without A week after they said they would send the secondary and other parts, I called to ask if things had been sent. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler.
With Simple | Space We are now ready for some testing. I used my router to "mill" a flat area for better contact with the focus adjustment rod. 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 astronomy.
Tom's Homemade Telescope Page - Udder Nonsense - Google As the authors describe the benefits of a truss design, it is hard to dispute their arguments. The overall project is super cheap, we're building this thing for something like $50 in materials. To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co. Download and check them out, I just grabbed the first one and printed it. After another 3 weeks, I was concerned that I had not received the mirror.