homemade telescope focuser

In order for the Rocker Box to pivot on the Ground Board, a center pin is placed in a hole at the exact center of the Ground Board and Rocker Bottom. You should watch (and bookmark) this video. You can see that my Moonlite focuser was slightly larger than the sides of the tube. How to make a $30 DIY star tracker for astrophotography 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. I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Thanks Pinbout for sharing your design. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. 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. Crayford-style design with four bearings and one driveshaft. (Technically, it should have been 62.5 for a 12.5 inch f/5, but when the mirror came it had a note on the back that the focal length was 61 inches.) The mount and tripod are pretty much useless for astrophotography. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. While round tubing is sturdy, square tubing is easier to work with. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. I attached them with very small brads, countersinking the brads. The email bounced back to me. 11 years ago DO NOT drill out the holes in the board! 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. Download and unzip. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. 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. Our websites use cookies to improve your browsing experience. I set things up in daylight and collimated the scope. 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 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. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). New Creation Tamil 6.96K subscribers Welcome to New Creation Tamil Our Channel include of Guiding Videos: 1.DIY Projects 2.Awesome Ideas 3.Tips You are inter with New Creation Tamil you can enjoy. His project is very well documented. Several functions may not work. forces the knitting needle against the drawtube and the drawtube against It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. If you enter it in the next contest please let me know and i will make sure to vote for you. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. The cell from Anttler's, for which I had received a refund, had arrived. I do it with aluminium alloy, aluminium tube and nice work. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. I made this Crayford style focuser using plywood scraps and surplus bearings. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. eyepiece on the ground (or worse, on your primary mirror!) This sure is going to be a project I will work on. I also have an extended photographic build diary of this telescope posted on Imgur. a try. After the second call, I received a response that it would be ready at the end of the following week. experimented with various wires and rods and eventually decided that a This is the kind of simple off the shelf design I was looking for. To cut the circles, I used a router with a straight cutting bit and a circle cutting jig. 4 years ago I paid the 50% deposit and dreamed of DSOs. It takes the unknown out of focusing, and is easy to re-focus between filters, or refocus several times during a long exposure run as the world cools down. Telescope Magazine. I found out pretty quickly that building my own telescope would only be a bargain if I made my own mirror and mechanical parts. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. The kit just contains the electronics - it is up to the user to find a stepper motor and attach it to their own telescope focuser. 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. spambots that search the internet for addresses to send junk mail to.) Some quick tips to note if you are making a homemade telescope are: 1. The 2-1.25" adapter is a sink drain slip fitting in 1-1/4" size that slips into the large tube for 1.25 EP's. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. The balance point determines the height of the rocker sides, so I had to get this far before I cut the wood for the base. Finally it was etched in caustic soda, and anodised matt black. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. Telescope Focusers | Orion Telescopes: Shop 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. 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. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. It's rigid, lightweight, and While a sling or whiffletree provide the best edge support, a two-point edge support is much easier to construct. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. I have several of the books on building a Dobsonian Telescope. Crayford-style design with four bearings and one driveshaft. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. This is not recommended for shared computers. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. 10 inch or 12 inch. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. larger diameter. an inch or so apart, so the focuser body could be pretty low profile. We all know the problems with focusing. NEMA-17 Stepper Motor - see below, there are two options. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. Obviously an open truss telescope. I waited until dark and pointed the scope at the sky. Use mild soap and distilled . 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. Step 4Attaching the Side Bearings and assembling the Rocker. Best Wishes, Reply The bearings only need to be adapter set screws to slide into. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. "); During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. This is the first telescope that I have built. 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. 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. Once you get it working, there's some calibration you need to do. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. 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. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. I 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. You reach a point where the picture doesn't seem to change much, so you never know where the very sweetest spot in the focus is. var pageTracker = _gat._getTracker("UA-1008534-4"); After the glue dried but before the clamps were removed, I added corner braces to all four corners of the tube using glue and brads to hold them in place. 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. The secondary holder is adjustable, so I could didn't have to get the location perfect. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! It doesn't. A tilted focuser will have no effect on the image quality. DIY Craford Focuser. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. Thank you for your pages. The original Crayford Focuser is on display there. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. wobbly knob still works, and adds character. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. Another vote for Pierre's helical Crayford design. Fairly easy to build and could be adapted to suit any SCT focuser. . Fire up focusmax, and shoot some images! A wide hole will let the knitting needle creep Before I wrapped the tube (and before I discovered the problem with the primary placement) I determined the balance point on the tube. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! Contact cement is permanent, so the only solution would be to replace the tube! And, once your telescope is finished, be sure to join a local astronomy club to learn more about the sky and share your hobby with others. 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. Download the Gerber Files. The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. Link to the motor speed controller kit:http://www.jaycar.com.au/productView.asp?ID=KC5225(a 5K external potentiometer will be required): http://www.jaycar.com.au/productView.asp?ID=RP3508The drive motor:http://www.jaycar.com.au/productView.asp?ID=YG2734The gears:http://www.jaycar.com.au/productView.asp?ID=YG2736The motor forward/reverse switch:http://www.jaycar.com.au/productView.asp?ID=ST0506The push button:http://www.jaycar.com.au/productView.asp?ID=SP0711 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 used my router to "mill" a flat area for better contact with the focus adjustment rod. the bearings right at the edge of the frame, reducing the frame to I told them to take their time and get it right. on Introduction. OK, no, I do not have a homemade Crayford focuser but am planning to build a 3 incher for next years 17" reflector telescope project and to hold my new 30mm ES 100 degree EP. The next day my wife called me at work to tell me a box had arrived with telescope stuff. I don't have the skills to build a focuser using a. This book describes in great detail the steps to build a large aperture truss tube dob, focusing on scopes with a 12.5 to 40 inch mirror. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it. A Pocket Sundial From a Broken Pocket Watch! scope, I only put knobs on the outsides. 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. I applied contact cement to the first inch of the veneer and the mating inch of the tube. And the legs of the base should be as wide as possible to accommodate weight imbalance as the telescope is moved around, to avoid tipping. How to build a 12.5 inch closed tube Dobsonian telescope. In my case I decided to make a custom bracket. The little app is simple and works great. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. This makes for better sky photographs as the exposure time can be lengthened,. I decided to use baltic birch because it is recommended by Kriege and Berry as well as many online sources. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. My guess is that photo was taken with a refractor. The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). Build a Backyard Dobsonian Telescope - Make: DIY Projects and Ideas for Measure twice, drill Someone is pulling someone's leg here. Membership connects and supports the people and projects that shape our future and supports the learning By adjusting the bolts, the mirror can be pointed toward the correct spot. The mirror cell: University Optics (eventually). Helical is one of the option i am considering. forward and back along with the drawtube when you focus, and you'll get We are now ready for some testing. This motor is available on Amazon. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. the nylon screws going up from the bottom, but I found the knitting The project took several months off and on to complete, although a skilled Maker could put a similar one together in a few weeks. At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the Rochester Astronomy Club. I feel it is a wonderful thing to free oneself from the "store-bought" world, as Tombaugh did, and to use your imagination and skills to develop your own, personal way of viewing the sky. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. it sticks into your light path. I built a second set of electronics, and I had the NEMA 17 Direct Drive motor left over since it didn't work for my Orion ED80T-CF refractor. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. 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. accessible by all ages and skill ranges. curated by us, the people behind Make: and the Maker Faire. 11 years ago This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. Like i said these are not my photos and i cannot coment on exactly how he set it up as i was not there all i can say is i saw the mount he used when he picked up the telescope. That's pretty much the focuser. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Or rather, I hated it. the side of a rigid secondary cage. Slide the eyepiece into the focuser and try it out. 8 years ago Able to shift heavy loads of kit ie over 1000g. I decided to order an aluminum mirror cell from University Optics instead so that the mirror could be supported at 9 different points. The cutting diagram in (figure 1) shows how I cut the required pieces from two 60 X 60 pieces of Baltic Birch plywood, one inch thick, and one 5/8. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. on Step 1, Richards in our local astronomy club. The focuser is very smooth. I did not wrap the tube until I had completed the base. once. 100A81BF-2145-44D5-BC76-66DBF43BAD58.jpeg. 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. Nice work and great instructable! Share a cool tool or product with the community. knitting needle where it goes through the hole, so it's not a big deal, I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. Maker-written books designed to inform and delight! I took the whole tube assembly outside. My homemade motorized telescope focuser for Celestron C8. Plus it comes in black, so It just 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. The last chapter of the book describes a plan for an 8 inch sonotube dob with a few design elements from their truss design, and, as I read that chapter, the simplicity of its construction was very appealing. I could not find a spacer to fit my 9/16 hole, so I bought the 11/16 spacer (1 1/8 long because that's what the store had) and a bit of the same size. Since these focusers were going side-by-side on a binocular The plate has slotted screw holes for tensioning the 6mm belt. The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. 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. For my project I needed a 14 inch diameter, and I had a tough time finding one. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. Post 10 of the same LSDF focuser thread also links to Art Bianconi's archived 2008 original flush valve focuser posts.

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