homemade telescope focuser
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. Frustrated by these difficulties, I stopped by one more hardware store to ask for advice. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. With the DRV8825 and Arduino Nano plugged in, the basic board is complete. 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. 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. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. Make the hole diameter fairly snug, too. Part numbers 351-4574 and 336-422. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! pageTracker._trackPageview(); 11 years ago It took about 3 weeks but, since Anttler's did not even reply to the Paypal dispute, I received a Paypal refund. I told them I was on my way. focusers for that project. the bearings, totally eliminating any flex. 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. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. Or in my case, back to SolidWorks :-). 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. I would love to see your build when you are finished with it . I don't *do* pretty. Well, it sort of looks like a focuser.. See pictures below. A Pocket Sundial From a Broken Pocket Watch! Fast forward a few months to the next time I had the tube outside. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. I suspected that the company was either in trouble or no longer in business. Share it with us! It took yet another call a week later for the items to actually be mailed. 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. I think I got what I wanted and seems best solution for me. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. 3D Printed Futuristic Space Age Wall Clock, http://www.cloudynights.com/ubbthreads/showthreaded.php?Cat=0&Number=4721255. They're fairly I've been using the above pair exactly 2" with adhesive labels placed one at a time inside the tube I tried this one first and found it wouldn't work for my application. The Artemis module works extremely well, and is to be strongly recommended. After researching several possible sources for a primary mirror, I decided to order an f/5 12.5 inch mirror from Discovery Optics. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. And you can tell it's not a mosaic because the stars at the corners show coma/field curvature artifacts. This is where you will use screws to strongly attach the focuser onto the tube. } catch(err) {}, SH-232 Sharpless sh-232, sh-231, sh-233, sh-235, NGC2174 Monkey Head Nebula, Sharpless 252, Sh2-252, HDW3 Hartl-Dengel-Weinberger 3 PN G149.4-09.2, SH-198 Sharpless 198, Soul Nebula, IC1848, NGC281 IC11, Sharpless Sh2-184, Pacman Nebula, SH2-173 SH2-173 Phantom of the Opera LBN 593, SH2-168 Sharpless HII regions. 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. When you want to focus, you just open the program and press focus. You will have to line up the diagonal and primary so that you see a centered image of the sonotube opening and the spyder in the eyepiece hole. If you wanted to really go low-profile with this design, Not sure if it is available in the USA. I do it with aluminium alloy, aluminium tube and nice work. LVLaserTech is right please do not vote for the pictures my instructable is for the build of the telescope not the quality of the photos.and as i said before i was not there is there a possibility that he sent me the wrong photos sure is there a possibility that he used a different mount than the one i saw sure is there a possibility that he is lying to me me about what he did sure. While I applaud your building of a homemade Dob, (giving you the FULL benefit of the doubt here) your "friend" has provided photographs that make it look like you're trying to win by cheating. I don't have the skills to build a focuser using a. Electronics and software automate the process of taking pictures. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. 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 had chosen a boxy, rigid design for the binocular scope, so See captioned photos 22-25 here:https://www.cloudyniractor-focuser/ for more detail on building a flush valve focuser, as Bob mentions. Only problem is if I put a diagonal it wants to rotate the helical part. Once your telescope is assembled, drape black woven velveteen around the truss assembly, clipping it with safety pins. control. 4 years ago I call shenanigans on every picture in this post except for the the moon. DIY Electric Focuser - ATM, Optics and DIY Forum - Cloudy Nights microcontrollers including Arduino and Raspberry Pi, Drones and 3D Printing, and more. I would also like to know about how you can take such fantastic pictures without a field rotator and an autoguider system. Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. 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. This NEMA-17 direct drive stepper motor is available from Adafruit and many other sellers. Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). The pivot bolt consists of a 1 1/8 inch brass spacer with an 11/16 inch outer diameter, a 3/8 inch bolt 2 inches long, a stop nut, and two large washers. I used my router to "mill" a flat area for better contact with the focus adjustment rod. 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. Community Forum Software by IP.BoardLicensed to: Cloudy Nights. It is size 1.25 inch with a clear inside dia-meter. Your design is simple and nice. These will be stored in your browser only with your consent and you have the option to opt-out. If you go to buy all of the components for this project from dealers, you will see that you mostly have to buy at least 5 parts, sometimes bags of 50 parts! 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! how much travel you actually need, you can cut the tube off so none of a try. After a dry fit of the rocker to make sure that the tube box with side bearings would fit well, I glued the rocker sides to the rocker front, holding them in place with small nails and clamping overnight. Wooden Telescope Part 2: Tube and Mount - Instructables My wife helped me by moving the mirror into and out of the tube around the marked spot while I stood at the eyepiece trying to bring some distant trees into focus. I drilled the holes in the center of the ground board and rocker bottom using a 9/16 bit, thinking that I needed the extra 1/16 so that the spacer could move. I'm also going to focus on only one version of Robert's focuser (there are many). Featured in the February, 2015 issue of Sky & (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.) A celebration of the Maker Movement, a family-friendly showcase of invention and creativity that gathers During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. Here is a link to the main FILES area on Robert Brown's site. I laughed, packed up the cell with a long letter describing the series of events that led to the return, and put it in the mail. Several clamps were used to hold the pieces together overnight. The base and the rocker box in my telescope are secured with a skate bearing assembly but could be more simply attached with a bolt through the center. 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. once. I These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. I told them to take their time and get it right. In amateur astrophotography, we run our telescopes overnight. stronger, but would give me a coarser focus action because of their That is dirt cheap compared to the cost of commercially available focusers, which can top $1000 and are much heavier than what we will build. 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. It may need some careful coaxing with a screwdriver. My homemade motorized telescope focuser for Celestron C8. This is the first telescope that I have built. I have no dog in this hunt whatsoever, but if people are impressed by these photographs and vote for it because of them when there's no proof that this scope generated the photos and there IS data to the contrary (see below), then that's certainly not fair to the other contestants. 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.". Some of the very best planetary and deep sky pics I have seen have come from a Fuji S3 professioanl camera [based on a Nikon body] and a Canon 20Da, which was designed with [I think] a user replaceable inside the mirror box filter for astral photography. After going over the surfaces with a tack cloth to pick up the saw dust, I applied the stain and went over it with cheese cloth rags for an even finish. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. 10 inch or 12 inch. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. Focusers of telescopes. Types, difference, specifications - Star Hunter In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". Now attach the screw eyes and the rubber band on the side of the board. Our websites use cookies to improve your browsing experience. telescope page, I wasn't really eager to buy two commercial Crayford 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. Finally, attach your polar alignment device and align it with the hinge. It's easy to shim it to I Hope to give you ideas if you are thinking about building one for yourself! This motor is available on Amazon. I waited until dark and pointed the scope at the sky. 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. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. 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. on Introduction. Make the drawtube longer than you think you'll need, just in Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). both sides. flexing. occurred to me that a square turned 45 degrees would give me two flat I have no idea how much mail this idea will generate, so I can't needle to be just a little too flexible for the weight of a diagonal and My other telescope is a Celestron NexStar C6E. 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. 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. All that remained was to design and print a bracket, and buy the needed parts. 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 have not yet figured out a better way to hold the tube. 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. The diameter of the focuser is usually indicated in inches. I only use the OTA. Orion Dynamo Mini for powering a Nexstar 6SE? Headers for the LEDs, buzzer (2-pin) and temperature probe (3-pin). My secondary is 4; for tips on choosing size, click here. Several of my Recent Images have been focused with this system. until a 2" eyepiece or 1.25" adapter is snug. 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. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. Motion is very smooth. It had been described by many as the most important recent volume for anyone planning to build a dob, and I have to agree. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. My guess is that photo was taken with a refractor. At their suggestion, I also ordered a 2.6 inch secondary mirror. The belt and pulleys are off-the-shelf items available on Amazon. Pioneered by John Dobson in the 1960s, the instrument combines a Newtonian reflector telescope with a unique two-axis movable base. 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. Before finishing the tube with a wrap of veneer, I wanted to make sure that the primary was in the correct position. (A badly tilted focuser may subtly alter the illumination pattern of the focal plane to a degree that would be impossible to perceive visually but that's about it.) Did you make this project? 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. Helical is one of the option i am considering. Connect the Arduino USB cable and upload some test sketches. Knitting needles are The telescopes size is classified by the size of its mirror. 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. If you mess up, you can turn the hole into a slot, but avoid homemade Crayford focuser. Please re-enable javascript to access full functionality. I placed my telrad, optical finder, and an eyepiece on the focuser end of the tube and, using a broomstick as a balance point, found that the tube balanced 22 inches from the bottom. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. Homemade DIY focuser for telescope with computer control - NEUTRAL.org This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. The focal length of the mirror is 61 inches. 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. 5 weeks after I had ordered the mirror, I called to ask about its status. So, as they say, "back to the drawing board". It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. drneilmb, thanks for sharing the focuser design. Depending on your telescope, one of the Brackets that Robert has may work for you. 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.
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