Your choice here will be recorded for all Make.co Websites. 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. Since these focusers were going side-by-side on a binocular spambots that search the internet for addresses to send junk mail to.) 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. Trim off any unused fabric along the base. The bearings only need to be Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). 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 the nylon screws going up from the bottom, but I found the knitting 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting Our websites use cookies to improve your browsing experience. astronowanabe, Pierre Lemay, LarsMalmgren and. To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); you could probably space the bearings 3/4" apart instead of 1" and mount Im quite happy with the result, and the view in its large mirror is phenomenal. I do it with aluminium alloy, aluminium tube and nice work. His project is very well documented. You can view and download the full file here. I hate focusing. Bill, Impressive work and great idea about LSDF focuser. 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 hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. 1N5408 3A Diode (you may need to make the pins smaller to fit through the holes in the board. Here are a few photos of the "bracket", which is a simple 3D printed plate that mounts to the telescope's focuser ring, and serves as a mount for the stepper motor. See the images how I plan to assemble it. 7 years ago in the tube so they'll hit the knitting needle before your drawtube runs This allowed me to cut perfect identical circles. Just drill holes in both ends and mount the lenses. 5 weeks after I had ordered the mirror, I called to ask about its status. 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. 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. 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. focusers for that project. focuser. Thanks Peter. 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. 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. Im sorry to hear you couldn't make the contest. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. The current needs to be adjusted on the DRV8825. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. Nice work and great instructable! 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. Here is a link to the main FILES area on Robert Brown's site. Install on Windows 10, this part is pretty straightforward. #2 knitting needle would be just about right. That helps with low-profile The project creator Robert Brown made a good video on testing the board. Best Wishes, Reply As I mentioned on my binocular In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. "https://ssl." Perfect for visual observations with very heavy mirrors. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. You will look through these as you rotate the wheel. Download the Gerber Files. I didn't bother reading his whole article to figure out what f/# he used) I am not trying to say that good AP isn't possible with a sonotube scope, (the 'friend' may very well have pulled it out of the dob mount, added rings and a dovetail, and mounted it on his CGE-Pro or comparable) but in this case it is unlikely.". The extra force will also Here's a detailed response from a thread at CloudyNights:http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255 "The image scale is wrong on the M31 image, fits too much of the galaxy in for even a 35mm chip. Thanks for your article. 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. After the pieces were glued together, I used a belt sander to smooth out any rough edges, being careful to keep both rocker sides and both side bearings exactly the same. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. The focuser knob had two set screws. can't click on it or copy and paste it; it's a graphic file to thwart Depending on your telescope, one of the Brackets that Robert has may work for you. If you're not familiar with Arduino, watch some tutorial videos. Focuser (GSO 2 speed low profile Crayford): $139 Ebony star strips: 2 @ $10 Ebony star ring: $59 Teflon strip: $11 Telrad base: $10 Baltic Birch " sheet (60X60): $42 Baltic Birch 5/8" sheet (60X60): $48 Circle cutting jig: $30 Birch Veneer (4X8 piece): $65 Hardware, stain, other supplies: $80 Total cost for supplies for this project: $1700 Telescope Magazine. It turns out that sonotubes are a stock item in 8 inch, 10 inch, 12 inch, and sometimes even 16 inch diameters. The back of the mirror floats on 3 or more support points (this build uses 6) that are calculated usinga software tool called PLOP. But I wanted a larger mirror, and, at that size, grinding my own was not an option. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! An electronic focuser, which moves the focus knob through a combination of hardware and software, solves this problem. Interfaced with a computer, so the computer can make the decisions about where the best focus is. 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. 4 years ago My guess is that photo was taken with a refractor. In amateur astrophotography, we run our telescopes overnight. 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. Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. Plus it comes in black, so 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. It may need some careful coaxing with a screwdriver. I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. I tried to call, but the voice mail had a recording stating that the customer was unable to receive messages. Please re-enable javascript to access full functionality. - Bill. Cost is $25 - $30, and you will have 5 PCBs in about a week. 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. The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. My other telescope is a Celestron NexStar C6E. A project collaboration and documentation platform. The bigger upvc nut will be attached to focuser plate and longer threaded side will be used on it for the focusing. This motor is available on Amazon. 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. I wanted to wrap the tube in veneer because I had seen a homemade telescope on a website that used veneer and I liked the look. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. With adapters for any Meade 1x200-ACF or LS model, and chord to plug into focuser port. and an eyepiece. As I understand, you are using it for a refractor. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. The blue pieces of the rocker box and ground board are arranged as in the diagrams in (figure 2). I was certain not to move the jig at all before cutting the second circle. 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. 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. i am not trying to win this contest with photos. small, it's surprisingly rigid. And a couple of upright bearing blocks. There are a number of technical reasons why these photographs could not have come from this Optical Tube Assembly. Meade Zero Image-Shift Electronic Micro-Focuser This high precision focuser allows you to obtain an extremely accurate image focus. The motor is much lighter than the geared motor. After another 3 weeks, I was concerned that I had not received the mirror. weight. I don't have the skills to build a focuser using a. A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers
Once I decided to build a scope myself I had to decide on the aperture of the scope. 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. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. 8 years ago I did run into a small problem with the focuser. try { Home centers and hardware stores did not carry large sizes. on Step 1, Richards in our local astronomy club. Tips If you've got a 1.25 inch focuser, You can also use it for an objective. Dobsonian telescopes are popular with amateur telescope makers for their ease of design and construction, portability, and their use of large optical mirrors. I paid the 50% deposit and dreamed of DSOs. You currently have javascript disabled. 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. I had some carboy caps that make good knobs. Download and check them out, I just grabbed the first one and printed it. adapter set screws to slide into. During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. Someone is pulling someone's leg here. Drill the holes for the knitting I call shenanigans on every picture in this post except for the the moon. 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. 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. The glue should keep the nylon from fraying. The plate has slotted screw holes for tensioning the 6mm belt. However more than the focuser, I liked your scope. I did not glue the bearings to the tube box in case I needed to adjust the position later. I have not yet figured out a better way to hold the tube. wobbly knob still works, and adds character. 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. It stalled when tension on the belt increased. This makes for better sky photographs as the exposure time can be lengthened,. (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.) As the thread shows you could also build the dual speed version, all made of plywood, if you feel ready to tackle a slightly more complex project for a cost of about 5$ more. Parts List (the full story of acquiring the parts), The primary, secondary, spider and secondary holderDiscovery Optics. once. And a flat thing to put it all on The version number "312" here may change if Robert posts new firmware. I had already made a lightweight focuser for NEMA-17 Stepper Motor - see below, there are two options. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. The wide square footprint would make it pretty stable when mounted to I set things up in daylight and collimated the scope. Accordingly, with 1.25 focuser, you can use 1.25 eyepieces, with 2 focuser - both 2 eyepieces and 1.25 (through a special . The cost is a bit more than some of the other combinations, but by only $10 or $20. tube and nut that fits the outside threads. On the cutting diagram, you can see that the side bearings were cut 26 inches long. Sonotube (14 inch diameter, 12 feet long): $70, Focuser (GSO 2 speed low profile Crayford): $139, Total cost for supplies for this project: $1700. "); How to build a 12.5 inch closed tube Dobsonian telescope. Your astrophotographer friend may have included his own images from his setup. Deep space photos like these require HOURS of exposure for each one. I only use the OTA. Pretty dry but important! I suspected that the company was either in trouble or no longer in business. Able to shift heavy loads of kit ie over 1000g. Realizing that it could not be the University Optics cell already, I thought, Noit couldn't be but, in fact, it was. the drive shaft close against the drawtube. Electronics and software automate the process of taking pictures. Save over 40% off the annual cover price for a full year (4 issues) of Make. The flat wants to be running parallel to the long axis of the tube. 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. 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. microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. 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. In my case I decided to make a custom bracket. narrow the frame. 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. 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.
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