So I was looking for a cheap, light-but-sturdy design for a The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. Using a compass I drew circles on the top and bottom of the ground board to mark the inside and outside of the teflon ring on the bottom of the rocker bottom. Given that you can make the drawtube any length you After you've done that, put a couple of tiny pan-head screws If not, you may need to design and print your own bracket(s), gears, and so on. At this point, the scope was pretty much finished. on Step 1, Richards in our local astronomy club. stronger, but would give me a coarser focus action because of their 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. This motor is available on Amazon. installations. Membership connects and supports the people and projects that shape our future and supports the learning My first telescope I built was a 10" F8. So, as they say, "back to the drawing board". Im quite happy with the result, and the view in its large mirror is phenomenal. When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. It seems to Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. 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. Nice one. 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. I made this Crayford style focuser using plywood scraps and surplus bearings. was straight so I wouldn't get a wobbly knob. They even offered to send the spider, secondary holder, and secondary mirror immediately so that I could begin working on the tube while I waited for the primary. on Step 5. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. In order to check your measurements, you can construct jigs for your mirror cell and secondary cage, positioning them on a straight, adjustable track such as 2 planks of wood. We are now ready for some testing. Plus it comes in black, so This is the kind of simple off the shelf design I was looking for. A decent machinest will do a far better job, but, there is always a lot more pleasure to be gained per astrophoto when you make bits yourself. 10 inch or 12 inch. 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. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. Have you made any mods on it since you built it? As I understand, you are using it for a refractor. knitting needle where it goes through the hole, so it's not a big deal, All in all it seemed like a pretty robust design, so I gave it As I mentioned on my binocular The secondary holder is adjustable, so I could didn't have to get the location perfect. The telescopes size is classified by the size of its mirror. But who cares, really? eyepiece on the ground (or worse, on your primary mirror!) I have no dog in this hunt whatsoever, but if people are impressed by these photographs and vote for it because of them when there's no proof that this scope generated the photos and there IS data to the contrary (see below), then that's certainly not fair to the other contestants. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, These will be stored in your browser only with your consent and you have the option to opt-out. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. 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. It took a lot longer than I expected to receive my mirror and other parts from Discovery. The hole is made slightly larger than the shaft, this is normal. Download and unzip. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. 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. They eyepiece height ended up being about 5'10" high at zenith. The next day, I centered the rocker on the rocker bottom (which had been cut using the same method as the side bearing circles), drawing perpendicular lines through the center of the rocker bottom to use as a guide, and tracing the position on the rocker bottom. Whether you need a basic rack-and-pinion telescope focuser for your homemade telescope project or a premium Crayford-type model with dual-speed focusing as a performance upgrade, you have come to the right place. Having an RS trade counter 2 miles away is such a luxury! 7 years ago And bolt to scope 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. I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. Upload that main sketch to the Nano. Please feel free to email me at the address on the right. Unbelievable! Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. The curved sides of the Side Bearings are also covered with strips of Ebony Star that glide on the teflon pads on the curved edges of the Rocker Sides (figure 3). . narrow the frame. This cost around $100 to build and all of the components came from Jaycar, except the brackets which were made with 1.2mm sheet metal. Our websites use cookies to improve your browsing experience. 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. This is the first telescope that I have built. If you go to buy all of the components for this project from dealers, you will see that you mostly have to buy at least 5 parts, sometimes bags of 50 parts! 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. A couple setscrews and you're up & running with an off the shelf solution. You will need to order one sized for your telescope's focuser shaft size. Inside the OTA is a ring of tightly fitting flocking paper that prevents any light getting in around the drawtube. The part is very strong! There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. My other telescope is a Celestron NexStar C6E. I Hope to give you ideas if you are thinking about building one for yourself! Start with the small components first. I had chosen a boxy, rigid design for the binocular scope, so can't click on it or copy and paste it; it's a graphic file to thwart spambots that search the internet for addresses to send junk mail to.) The sides were attached with wood glue and clamps with a few small brads to hold everything in place. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. Finally, I glued a strip of Ebony Star laminante to the curves edge of each side bearing using contact cement, using a flush edge bit on a router to bring the edge of the laminate even with the edge of the wood after the cement had set. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. I sourced my own Stepper motor and 1:150 reduction gearbox from RS, who are just up the road. The only thing on the list that was a bit difficult to find was baltic birch plywood, which had to be special ordered from the lumber yard. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & This was to allow the circle cutting jig to be attached to the board to cut the arcs from a center point of 25 inches above the ground. Ask Question Step 5: Stepper Motor Choice #2 - NEMA-17 Geared Stepper Motor If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. I also have an extended photographic build diary of this telescope posted on Imgur. 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. Make the drawtube longer than you think you'll need, just in I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. pageTracker._trackPageview(); Other supplies that I bought for this project include wood, various bits of hardware, stain and finishing supplies, and a circle cutting jig for a router. 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. (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.) Thicker knitting needles would be even More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? For a while I decided that 10 inch would be the best size. They're fairly 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 wanted to finish that instructable before the contest ended but was too late :-). 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. We then spread contact cement over the remaining veneer and tube surface, waited for the glue to dry, and carefully rolled the tube over the veneer. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. 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 After a dry fit of the rocker to make sure that the tube box with side bearings would fit well, I glued the rocker sides to the rocker front, holding them in place with small nails and clamping overnight. Be creative! But, especially on cold evenings, the focus may go out in the middle of the night. Once I had my design set, I was ready to buy the parts. Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. This cost around $100 to build and all of the components came from. DO NOT drill out the holes in the board! I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Cost is $25 - $30, and you will have 5 PCBs in about a week. you don't need to paint it (or worry about paint flaking off it). They have many items for ATMers and I had frequently visited their website when planning my scope. I think I got what I wanted and seems best solution for me. $299.99 More About Telescope Focusers I started with a spacer that with a inch outer diameter. 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. help eliminate slippage when the focuser is pointed straight upward. widening the hole. Please explain, in detail, how you attached your tube to the very unique drive system of an XT12G mount. It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. I laughed, packed up the cell with a long letter describing the series of events that led to the return, and put it in the mail. That's pretty much the focuser. Now attach the screw eyes and the rubber band on the side of the board. 8 years ago I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. Picture of DS-4. This arrangement turns 100% true, no wobble. I'd how much travel you actually need, you can cut the tube off so none of I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. Did you make this project? The plate has slotted screw holes for tensioning the 6mm belt. Finally, attach your polar alignment device and align it with the hinge. This resulted in a gear that wasn't true and "wobbled" a bit. exactly 2" with adhesive labels placed one at a time inside the tube As I read the book I decided that I should build a 12.5 inch truss tube scope. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. Share it with us! Measure the diameter of the exposed shaft. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. A wide hole will let the knitting needle creep Thanks again for the 'ible. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. . You will need to order one sized for your telescope's focuser shaft size. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. The Artemis module works extremely well, and is to be strongly recommended. There was the expense, for one, but also the I decided to use baltic birch because it is recommended by Kriege and Berry as well as many online sources. The arc at the top of the sides needed to have a radius 1/8 inch larger than that of the side bearings to account for the thickness of the teflon pads that would fit between. I had the thought that as long as I was going to build it I should build it as big as I could afford. 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. I called to express my concern and was told that it had all been packaged a few weeks ago and that it should have been sent. 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. It turned out that they had an incorrect zip code and the package was still waiting to be sent. But I wanted a larger mirror, and, at that size, grinding my own was not an option. large in diameter (1.6") so that adds to the fine-ness of the focus case you need more focuser travel than you thought. Download the Gerber Files. I had some carboy caps that make good knobs. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard!
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