It seems to It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. initiatives for the next generation of makers. 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. A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers 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. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. Feel free to take on that part if you like, but you're on your own :-). Two inch internal diameter drawtube. As I understand, you are using it for a refractor. I attached small felt pads to the inside of the keepers to protect the side bearings from scratches, but discovered that the side bearings would not fit because of the thickness of the pads. Share a cool tool or product with the community. I carefully cut exactly through the center of each side bearing circle to make my semicircles. 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. Helical is one of the option i am considering. rod for the drive axle it would have a fairly fine motion. The focal length of the mirror is 61 inches. Once I had my design set, I was ready to buy the parts. 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. The project creator Robert Brown made a good video on testing the board. This makes for better sky photographs as the exposure time can be lengthened,. I also wanted to strengthen and protect the cardboard tube. This will determine the size of the coupler you will use to connect the stepper motor. 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. and hope it doesn't fall off I don't have the skills to build a focuser using a. - Bill. Perfect for visual observations with very heavy mirrors. It doesn't. A tilted focuser will have no effect on the image quality. For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of The Dobsonian Telescope by David Kriege and Richard Berry. Thank you for your pages. Contact cement is permanent, so the only solution would be to replace the tube! Download the Gerber Files. Install on Windows 10, this part is pretty straightforward. Robert Brown did an excellent video on how to work out your stepper motor requirements. I did not glue the bearings to the tube box in case I needed to adjust the position later. I wanted a tight / press fit, so I only added half that, 0.25mm. I The original Crayford Focuser is on display there. Coupler for NEMA-17 Stepper Motor (also two choices, see below), LM7808 Voltage Regulator with TO-220 package -, Mini On/Off 3-pin 2-position slide switch -, Headers and wire (miscellaneous sizes and gauges), these are important so you can replace the component if it is damaged, LM7808 voltage regulator w/TO-220 heat sink package, 2-pin headers for 12V power and on/off switch. After another 3 weeks, I was concerned that I had not received the mirror. The overall project is super cheap, we're building this thing for something like $50 in materials. 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. You can view and download the full file here. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. It interfaces to the computer via USB and comes with an ASCOM driver. While round tubing is sturdy, square tubing is easier to work with. the interior diameter is just a nudge over 2". Please feel free to email me at the address on the right. 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. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. It turned out that they had an incorrect zip code and the package was still waiting to be sent. I told them to take their time and get it right. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. Well, it sort of looks like a focuser.. See pictures below. 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 am well versed in technology, have all the tools necessary to build my own! This cost around $100 to build and all of the components came from. I was finishing this inner debate when I got a copy of the book The Dobsonian Telescope by Kriege and Berry as a Christmas gift. experimented with various wires and rods and eventually decided that a A week after they said they would send the secondary and other parts, I called to ask if things had been sent. By adjusting the bolts, the mirror can be pointed toward the correct spot. Nice work and great instructable! Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. It's the same in form, but has a perfect, true 13.35mm hole. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. 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 little app is simple and works great. knob, and a drill press to make sure the hole for the knitting needle homemade Crayford focuser. The mount and tripod are pretty much useless for astrophotography. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. stronger, but would give me a coarser focus action because of their larger diameter. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. I also wanted to buy the other mechanical partsmirror cell, spider, secondary holder, and focuserso that the performance of these pieces was not limited by my skills. I'd Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). ASIAIR - Is there an easy way to load Messier catalog into Autorun? I would love to see your build when you are finished with it . It is size 1.25 inch with a clear inside dia-meter. 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. 10 years ago 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. Unfortunately I don't have a 3d printer. corners of the squares provide nice nooks for the eyepiece and eyepiece I only use the OTA. To view, go here: http://emediadesigns.com/focuser/ I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. This motor has a 5mm drive shaft. Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. Trim off any unused fabric along the base. on my binocular scope for quite a while now and really like them. 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. Secondary mirror with spider holder Search on eBay for a matched set. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. This design could be adapted to practically any telescope or focuser, so I've kept my outline on the project brief. 10 inch or 12 inch. It's rigid, lightweight, and my thoughts naturally gravitated toward a boxy focuser to go with it. work really well, for a fraction of the cost of a commercial Crayford But I wanted a larger mirror, and, at that size, grinding my own was not an option. 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. Position "0" is with the focuser all the way IN (at least for a refractor). A week later the cell arrived (on schedule) from University Optics. In my build, the cage was cut on a CNC router from plywood, with threaded T-nuts added to support a truss assembly. 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 would cost less and they have a very good reputation. on Introduction, Very nice build nikon20. 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. a try. eyepiece on the ground (or worse, on your primary mirror!) Again from the main FILES page, go to "ASCOM DRIVERS" and download everything. But who cares, really? I'm' glad I did, because I didn't like the first color that I had chosen. Thanks for your article. Motion is very smooth. You will need to order one sized for your telescope's focuser shaft size. The current needs to be adjusted on the DRV8825. I Hope to give you ideas if you are thinking about building one for yourself! The plate has slotted screw holes for tensioning the 6mm belt. When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. like, you can have as much focuser travel as you want no matter how I paid the 50% deposit and dreamed of DSOs. Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. That's pretty much the focuser. But, especially on cold evenings, the focus may go out in the middle of the night. on Introduction. 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. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! Un-real!!! 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. So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. Also, I will work with my computer geek buddies, so that we eventually automate it using Linux on a Rock64, to run kstars for tracking, on INDI. a "rubbery" feel. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. 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. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. I drew a guide line straight down the side of the tube and cut the veneer to length with one extra inch on each side68 inches long. This means you lose much of the night's images. 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. Your design is simple and nice. This is not recommended for shared computers. Showcasing amazing maker projects of 2022. Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. To test the concept I used a short piece of two inch PVC for the draw tube. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, 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. 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. I had cut the 12 foot tube in half in order to get it home in the first place, and a 6 foot section was the right size to work with for my f/5 12.5 inch.
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