Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. DIY Truss Dob input: How to design truss? This motor has a 5mm drive shaft. The bigger upvc nut will be attached to focuser plate and longer threaded side will be used on it for the focusing. I then attached the Ebony Star ring using contact cement. A Pocket Sundial From a Broken Pocket Watch! NEMA-17 Stepper Motor - see below, there are two options. Able to make myself using my own humble tools (or toys as the pros will call them!). Use mild soap and distilled . If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. My DIY Motorized Telescope Focuser - YouTube After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. At this point, the scope was pretty much finished. I used one of the top scraps from the rocker sides to mark an angle of 70 degrees from the center of the arc to the curved cut in order to properly space 1 X 7/8 teflon pads on the arcs. Please feel free to email me at the address on the right. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. All that remained was to design and print a bracket, and buy the needed parts. Some of these are essential for the basic functionalities of our websites. You need a drawtube of course. you could probably space the bearings 3/4" apart instead of 1" and mount . The little app is simple and works great. I knew that I would be returning the mirror cell to them, but just for fun I decided to see how it would fit in the tube. drneilmb, thanks for sharing the focuser design. I had some carboy caps that make good knobs. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. Fairly easy to build and could be adapted to suit any SCT focuser. I called to express my concern and was told that it had all been packaged a few weeks ago and that it, For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of, After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. I made this Crayford style focuser using plywood scraps and surplus bearings. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. It may need some careful coaxing with a screwdriver. A homemade 16 inch dob lightweight telescope, DS-4 - XMission Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. I had installed the mirror about an inch too far away from the focuser. by cranking Several of my Recent Images have been focused with this system. 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. Slewing to find an object and then tracking an object on the sky, so when you make a homemade telescope on the motorisation process you will need high speed for slewing and low speed for tracking or fine movements. I have seen some VERY impressive photos similar to those, taken with Nikon D700 and D300 cameras, with the proper filters- and mounts- on a quality scope. 11 years ago This cost around $100 to build and all of the components came from. To test the concept I used a short piece of two inch PVC for the draw tube. Rack & Pinion: For many years the standard focuser was of the rack-and-pinion type - a small pinion gear moved the flat toothed rack that was attached to or built into the moving focusing tube that holds the eyepiece.However, this geared system was far from ideal, with some wobble due to the friction fit between the fixed and moving tubes and backlash due to the gears. With Simple | Space I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & The motor is much lighter than the geared motor. Make the hole diameter fairly snug, too. Focusers of telescopes. Types, difference, specifications - Star Hunter and hope it doesn't fall off Since these focusers were going side-by-side on a binocular It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. How to make diy focuser pvc - YouTube the drive shaft close against the drawtube. large in diameter (1.6") so that adds to the fine-ness of the focus Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. All i did was supply the telescope as far as his camera equipment i dont know what he used i never saw it all i know is he had my scope for about a month while i was traveling and he gave me these photos. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. Before attaching the sides and front to the bottom with wood screws, I wanted to make sure those screws would not interfere with the Ebony Star ring that would be attached to the rocker bottom. stronger, but would give me a coarser focus action because of their A 6 in primary mirror does not have enough weight to make the dob stable. Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. 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. 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. They eyepiece height ended up being about 5'10" high at zenith. If not, you may need to design and print your own bracket(s), gears, and so on. 1" Rack & Pinion Focuser. We use cookies to continuously improve our websites for you and optimize its design and customization. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. Homemade DIY focuser for telescope with computer control - NEUTRAL.org The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. His project is very well documented. Their step by step instructions were invaluable to me as I built this scope. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. Actually getting the parts into my hands turned out to be more of a challenge than I would have expected, but in the end, I have a wonderful telescope that I enjoy very much. I small, it's surprisingly rigid. The hole is made slightly larger than the shaft, this is normal. Keeping with the 'simple ' part of your request, here is a helical 2"/1.25" focuser made from std plumbing parts. 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. Edited by sunrag, 28 May 2020 - 10:44 PM. It uses a primary mirror to capture and reflect light, a secondary mirror to direct light into an eyepiece, and a focuser to make fine adjustments for viewing. Participated in the Celestron Space Challenge. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. For about $3 we can buy a tank valve kit that has a threaded 2" i.d. Rather than use a sheet of plastic Kydex to finish the tube, as recommended in K/B, I ordered a sheet of birch veneer. Featured in the February, 2015 issue of Sky & a 3/4" thickness. too far. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. The extra force will also 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. Pretty dry but important! Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. In my case I decided to make a custom bracket. var pageTracker = _gat._getTracker("UA-1008534-4"); This means I can use FocusMax to do the focusing. I'm' glad I did, because I didn't like the first color that I had chosen. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. 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. Secondary mirror with spider holder Search on eBay for a matched set. (Sorry you It took yet another call a week later for the items to actually be mailed. ScopeStuff is awesome!! Having an RS trade counter 2 miles away is such a luxury! After another 3 weeks, I was concerned that I had not received the mirror. It has reminded me of one of my long term aims to make a telescope that has been buried by the demands of the rest of my life! I call shenanigans on every picture in this post except for the the moon. 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). If you are (for example) doing a focuser for a catadioptric telescope like a Celestron C-8 or similar, the focus knob has no load on it so this smaller, lighter motor will do the trick. 24 T-nuts, with matching 2 bolts and knobs, 8 Aluminum tubing, thin wall, 1 square, 4 lengths I got mine from Cycle 24, Black woven velveteen, 68 Cut it so it stretches along the 6 axis. After waiting for the stain to dry for a day, I applied polyurethane in two coats, going over the surface with 0000 steel wool between coats. It Best Wishes, Reply You will need to order one sized for your telescope's focuser shaft size. I used my router to "mill" a flat area for better contact with the focus adjustment rod. Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. on Step 3. : "http://www. the bearings, totally eliminating any flex. Crayford focusers are considered superior to entry-level rack and pinion All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. Thicker knitting needles would be even Focuser minimum height is 50 mm and maximum a little over 90 mm so it is good overall. 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. 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. the side of a rigid secondary cage. - Bill. Once I had my design set, I was ready to buy the parts. surfaces to put the bearings in and a vee at the bottom that would hold I phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. I had chosen a boxy, rigid design for the binocular scope, so I found a used 16 primary on eBay. "https://ssl." on Step 5, After much debit and doubt i have taken the photos down cause i cannot be 100% sure that they were taking from my scope as i was not there to verify them and i do not want my contest entry to be based on photos and not the build process. Trim off any unused fabric along the base. Using heavy grit sandpaper I brought back the surface of the keeper enough for the side bearings to fit inside the felt pads. 5 weeks after I had ordered the mirror, I called to ask about its status. This software creates a model of your telescope by measuring out of focus star sizes at various points. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. Robert Brown did an excellent video on how to work out your stepper motor requirements. once. . We tried this in our back yard, but found that it was too difficult to aim both the tube and the moving mirror at distant trees in our suburban yard. I decided to order an aluminum mirror cell from University Optics instead so that the mirror could be supported at 9 different points. Until I see photos of this scope setup for these pictures and an explanation of the exact equipment used, I cannot believe that these pictures were taken with this OTA. Share it with us! 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. After a few weeks of no communication from them, no ability to phone or email them, and no mirror cell arriving. Not sure how your toilets are built over there, but here they use what is called a tank flush valve. Stellafane The Focuser 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 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. When you figure out Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). There are sub-folders for the different versions. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. 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. A wide hole will let the knitting needle creep Very simple and portable. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. Easy DIY motorized battery free telescope focuser - YouTube Another vote for Pierre's helical Crayford design. The box should be deep enough to allow the mirror box to swing all the way down. Orion Telescope Focusers | Buy Direct and Save! on Step 5. installations. Able to make myself using my own humble tools (or toys as the pros will call them!) Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. Move the jigs until you can comfortably place a variety of eyepieces in the focuser and get a sharp image, then carefully measure the separation distances. Most people will want a knob on 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. For my project I needed a 14 inch diameter, and I had a tough time finding one. I added three inches for a margin of error and in case I need to rebalance the tube in the future, making a distance of 25 inches from the balance point of the tube to the rocker bottom. weight. initiatives for the next generation of makers. How to build a 12.5 inch closed tube Dobsonian telescope. Please re-enable javascript to access full functionality. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. Homemade 12.5 Inch Dobsonian Telescope - Instructables The side bearings are each made from 2 identical semicircles of 5/8 inch plywood glued together to make a thickness of 1 inches. Cost is $25 - $30, and you will have 5 PCBs in about a week. Measure twice, drill both sides. I'd 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting I would love to see your build when you are finished with it . knitting needle where it goes through the hole, so it's not a big deal, This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. Thanks Bob. One of the neat things about the square design is that the I plan to use an FTA over it in case an extension is needed. While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct. Remember: It is the quality and SIZE of the capture chip, NOT the megapixels that determines quality. Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. I suppose that one could complete this project without these two tools, but it would be difficult to cut the pieces accurately enough for a good fit. Building a Homemade Telescope Eyepiece - HubPages It's rigid, lightweight, and (I didn't have the primary mirror yet). Unbelievable! pageTracker._trackPageview(); To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co. was straight so I wouldn't get a wobbly knob. The wood would cost the same, as would pretty much everything except the mirror, so why not spend a little more on the mirror and go BIG.
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