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You will need to order one sized for your telescope's focuser shaft size. Plus it comes in black, so Crayford-style design with four bearings and one driveshaft. SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. A project collaboration and documentation platform. After the second call, I received a response that it would be ready at the end of the following week. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. Two such companies would not give me a price because the order of a single tube was too small. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. the nylon screws going up from the bottom, but I found the knitting Make the drawtube longer than you think you'll need, just in Funny how the bigger they are the better for dobs. narrow the frame. (The 8 inches from the center of the secondary to the field stop in the focuser is the same 8 inches from the center of the focuser to the top of the tube.) love to hear from people who are interested in this focuser design. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. Finally, attach your polar alignment device and align it with the hinge. More commercial crayford focusers are of a more enclosed form, whereas mine is more "open frame" approach. It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. Best Wishes, Reply 11 years ago Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". I wanted the long focal length for good contrast. think that design would be rigid enough under the weight of a diagonal Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. To test the concept I used a short piece of two inch PVC for the draw tube. spambots that search the internet for addresses to send junk mail to.) I set things up in daylight and collimated the scope. The holes in the main bracket the match the holes in the plate are oversize to allow for this alignment. once. Rock on! 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. 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. This software creates a model of your telescope by measuring out of focus star sizes at various points. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. How to build a 12.5 inch closed tube Dobsonian telescope. 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. You will look through these as you rotate the wheel. . I had the thought that as long as I was going to build it I should build it as big as I could afford. 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. exactly 2" with adhesive labels placed one at a time inside the tube This will determine the size of the coupler you will use to connect the stepper motor. Picture of DS-4. The secondary holder is adjustable, so I could didn't have to get the location perfect. Crayford focusers are considered superior to entry-level rack and pinion focusers, normally found in this type of device. Start with the small components first. It doesn't. A tilted focuser will have no effect on the image quality. I call shenanigans on every picture in this post except for the the moon. Once the pieces were cut and I held them around the tube, I decided to cut them a bit smaller because the extra space was too much. I only use the OTA. Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. astronowanabe, Pierre Lemay, LarsMalmgren and. I then temporarily installed the secondary mirror so that I could measure the approximate distance to the center of the secondary in order to locate the holes for the focuser. 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. Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. On the bottom of the Bottom board is a ring of Ebony Star laminate that glides over the three teflon pads located directly above the feet on the ground board. To interface with the computer, I have used the Artemis Focuser module from Steve, Arthur and Co. Once I decided to build a scope myself I had to decide on the aperture of the scope. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. I would love to see your build when you are finished with it . The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. I hate focusing. 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. (actually, it ended up a smidge more than 2 inches). I did not glue the bearings to the tube box in case I needed to adjust the position later. You should now be able to drill the 4 holes at each corner. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. in the tube so they'll hit the knitting needle before your drawtube runs (Sorry you A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more After picking up a copy of The Dobsonian Telescope by David Kriege, I built my first telescope with a 12-diameter mirror, then later tackled a 12 lightweight scope. Gift the gift of Make: Magazine this holiday season! Building a Homemade Telescope Eyepiece - HubPages I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. how much travel you actually need, you can cut the tube off so none of These are mounted 120 degrees apart and use 4 inexpensive bearings to support the tube. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! (actually, it ended up a smidge more than 2 inches) Lighter than the existing focuser. In my case I decided to make a custom bracket. I do it with aluminium alloy, aluminium tube and nice work. 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. 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 Maker-written books designed to inform and delight! The lumber yard also gave me a lower price than I expected. Reply In amateur astrophotography, we run our telescopes overnight. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. I applied contact cement to the first inch of the veneer and the mating inch of the tube. Once I had my design set, I was ready to buy the parts. It may need some careful coaxing with a screwdriver. 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. 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. An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. 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. Unbelievable! Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. It has a 6mm shaft. 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. I started with a spacer that with a inch outer diameter. the side of a rigid secondary cage. Although they don't usually sell these parts, because I had ordered the mirrors from them they offered to sell me the spider and secondary holder that they use in their scopes. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. The wide square footprint would make it pretty stable when mounted to by cranking the bearings right at the edge of the frame, reducing the frame to 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. We use cookies to continuously improve our websites for you and optimize its design and customization. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. Motorise Your Own Telescope (updated 10-19-2017). - Instructables Once its cut to length, drill a hole through each end of the tubing with a drill press. To get a slide-fit in a 3D printed part, you normally make the hole 0.5mm larger than the shaft. A Beginner's Guide to Collimation - Gary Seronik The focuser is very smooth. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. 4 years ago I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. 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. 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. my thoughts naturally gravitated toward a boxy focuser to go with it. To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. 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. This sure is going to be a project I will work on. You currently have javascript disabled. help eliminate slippage when the focuser is pointed straight upward. Easy DIY motorized battery free telescope focuser - YouTube Look down through the empty focuser. 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. 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. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . Here we see the following components installed: Notice we are NOT populating the parts of the board intended for Wifi or BLED. One of the neat things about the square design is that the accessible by all ages and skill ranges. They suggested a construction supply place on the other side of the city that I had not called yet. 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. They eyepiece height ended up being about 5'10" high at zenith. I had designed the tube box so that there would be an extra inch around the tube. Several clamps were used to hold the pieces together overnight. As I mentioned on my binocular After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. Not sure how your toilets are built over there, but here they use what is called a tank flush valve. This project is based on Robert Brown's "Arduino ASCOM Focuser Pro2 DIY". So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. Your astrophotographer friend may have included his own images from his setup. At their suggestion, I also ordered a 2.6 inch secondary mirror. Build a Backyard Dobsonian Telescope - Make: DIY Projects and Ideas for forces the knitting needle against the drawtube and the drawtube against My homemade motorized telescope focuser for Celestron C8. I used my router to "mill" a flat area for better contact with the focus adjustment rod. 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. I Attach the ball head to the top board. needle so the knitting needle will be snug against the drawtube without When you want to focus, you just open the program and press focus. You need some purple bits Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. on Step 1, Richards in our local astronomy club. 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. 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. Knitting needles are I was inspired to build telescopes during a trip out to McDonald Observatory in west Texas, where I saw a 36 fork-mounted telescope, tiny in comparison to the huge research telescopes at the site. All that remained was to design and print a bracket, and buy the needed parts. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. My guess is that photo was taken with a refractor. 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. I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. It I'm only hoping to supplement it a bit with some info and pictures aimed at those with limited skills (such as myself) :-) I'm not an electrical engineer, I'm more of a software guy with some limited knowledge of electronics and basic soldering and assembly skills. I don't have the skills to build a focuser using a. Helical is one of the option i am considering. An Altitude Azimuth mount would also require a field rotator.There's no way these were taken with an Orion GoTo Mount. and hope it doesn't fall off I also have an extended photographic build diary of this telescope posted on Imgur. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. like, you can have as much focuser travel as you want no matter how - Bill. Homemade 12.5 Inch Dobsonian Telescope - Instructables I described it two years ago in this thread:https://www.cloudyniuser/?p=8879835 . The overall project is super cheap, we're building this thing for something like $50 in materials. This is the mirror box for my 16", with Jim doing a bit of cleanup sanding. I am well versed in technology, have all the tools necessary to build my own! I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. I then attached the Ebony Star ring using contact cement. My homemade motorized telescope focuser for Celestron C8. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. 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. Here is what I was working on but looks like I need a better design. My DIY Motorized Telescope Focuser - YouTube I did run into a small problem with the focuser. Thin 1/16 Kydex plastic should be cut to length to line the inside of the cage as a baffle to block outside light. Unfortunately I don't have a 3d printer.