rod for the drive axle it would have a fairly fine motion. Two inch internal diameter drawtube. Star Adventurer Pro Pack Counter Weight Bar Thumb Screw Upgrade. The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. The wide square footprint would make it pretty stable when mounted to like, you can have as much focuser travel as you want no matter how I told them I was on my way. It turns out the the extra 1/16 allowed far too much side to side movement between the rocker and ground board. SDO/HMI Continuum Image on 2023.03.04 at 1259 UT, Remote computer working with no extra networking. My newtonian telescope, like most others, came fitted with a nasty rack and pinion focuser. That way you won't be dropping your drawtube and Funny how the bigger they are the better for dobs. Reply 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. The cost is a bit more than some of the other combinations, but by only $10 or $20. Just as it was about to come into focus, the focuser bottomed out. This allows for a small clearance between the outside of the tube and the inside of the tube box (14 3/8). Once its cut to length, drill a hole through each end of the tubing with a drill press. 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. Thanks Pinbout for sharing your design. on Introduction. Perfect for astrophotography or during high power planetary observation. really stiff and light for their size, and even though a #2 is pretty 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. Able to make myself using my own humble tools (or toys as the pros will call them!) Attach the ball head to the top board. This is my copy of the telescope that Sir Isaac Newton presented to the Royal Society of London in 1671, and is considered to be the first successful reflecting telescope. 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. The Dob is really a great design. var gaJsHost = (("https:" == document.location.protocol) ? Im sorry to hear you couldn't make the contest. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. To place the primary mirror, I installed the secondary and installed the primary in the mirror cell. Two inch internal diameter drawtube. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. The curved sides of the Side Bearings are also covered with strips of Ebony Star that glide on the teflon pads on the curved edges of the Rocker Sides (figure 3). This proved fatal for the stepper motor! 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. I also doubled the thickness of the rocker sides (not the front wall) to provide better support for the heavier tube. focusers for that project. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. var pageTracker = _gat._getTracker("UA-1008534-4"); You can see that my Moonlite focuser was slightly larger than the sides of the tube. Depending on your telescope, one of the Brackets that Robert has may work for you. When you add the minimum distance from the eyepiece to the secondary mirror together with the distance from the secondary mirror to the primary, the total length should be the primary mirrors focal length. This combination has proved to be effective for all positions except when the tube is pointed directly up. Bore out some 2.5 inch bar and mill a flat down the side making sure it is lined up. Rather than use a sheet of plastic Kydex to finish the tube, as recommended in K/B, I ordered a sheet of birch veneer. They eyepiece height ended up being about 5'10" high at zenith. And a flat thing to put it all on If you're going for simple, have you considered a helical focuser? I did find, though, that the 3D printed gear would slip on the shaft, so it needed a set screw. The bearings only need to be Edited by sunrag, 28 May 2020 - 10:44 PM. needle so the knitting needle will be snug against the drawtube without Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. 10 inch or 12 inch. This cost around $100 to build and all of the components came from. The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. A smart collection of books, magazines, electronics kits, robots, microcontrollers, tools, supplies, and more drneilmb, thanks for sharing the focuser design. Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. After the second call, I received a response that it would be ready at the end of the following week. I would love to see your build when you are finished with it . These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. A 6 in primary mirror does not have enough weight to make the dob stable. I only do functional. I want to make this direct drive system work. Or rather, I hated it. After another 3 weeks, I was concerned that I had not received the mirror. Fast forward a few months to the next time I had the tube outside. 11 years ago 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. 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. Many sources point out that 10 inches is a kind of sweet spot in the balance between power and portability. Cost is $25 - $30, and you will have 5 PCBs in about a week. I told them to take their time and get it right. The lumber yard also gave me a lower price than I expected. on Introduction. 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. This unit takes signals from your computer and drives the stepper motor on the focuser. I did not own all of the tools that I needed for this project, particularly a table saw and router, so I did a lot of work while visiting my Dad. Share it with us! His project is very well documented. once. 4 years ago with a genuine question or comment about the design. Once I decided to build a scope myself I had to decide on the aperture of the scope. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. I welded mine from steel square tubing. When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. Two such companies would not give me a price because the order of a single tube was too small. When the skies were dark enough for observing I found that the scope moves easily into position and holds that position well. This extra space would allow the tube to be repositioned within the tube box to rotate the eyepiece or balance the tube. 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. needle adds no friction that I can feel to the focus action. Thanks Bob. I called to express my concern and was told that it had all been packaged a few weeks ago and that it, For complete instructions on building a telescope such as this one, I strongly recommend buying a copy of, After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. 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. This allowed me to cut perfect identical circles. (Sorry you I think I got what I wanted and seems best solution for me. 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. 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. the side of a rigid secondary cage. I then ran a bead of glue on the mark, and after it dried I cut out the nylon up to the glue. Robert is a super guy and more than willing to help those who choose to follow in his footsteps. This sure is going to be a project I will work on. I had designed the tube box so that there would be an extra inch around the tube. Topics such as During on-site assembly, attach each truss to its mounting T-nut using a bolt with a thumbscrew knob. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. This is where you will use screws to strongly attach the focuser onto the tube. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. I also wanted to strengthen and protect the cardboard tube. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. Another vote for Pierre's helical Crayford design. You really need a step ladder even for my 10" when pointed overhead. A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! To cut the circles, I started with a depth of about 1/8 inch, then lowered the bit and cut a little more with each pass until I was through the board. The little app is simple and works great. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. I started with a spacer that with a inch outer diameter. I used my router to "mill" a flat area for better contact with the focus adjustment rod. Share a cool tool or product with the community. can't click on it or copy and paste it; it's a graphic file to thwart Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. focuser. Another thing, the resolution on the Dumbell nebula seems a bit too high for that telescope. love to hear from people who are interested in this focuser design. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. It was easy enough to drill a hole and tap threads for a Your design is simple and nice. This is not recommended for shared computers. Newton, and others including James Gregory and Laurent Cassegrain, believed that a reflecting telescope would not be affected by the chromatic aberration that affected . 11 years ago The core of the telescope, the steel mirror cell holds and adjusts the heavy, curved primary mirror. 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting I had to take apart the focuser in order to get my bolts 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. together tech enthusiasts, crafters, educators across the globe. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. It is not very powerful, it will not supply enough torque if you put any load on it or have a heavy optical train (like I do) and the focuser has to "pull" it upward when the telescope is vertical. The focuser knob had two set screws. The company has a reputation for excellent optics, and it was neither the most expensive, nor the least. In amateur astrophotography, we run our telescopes overnight. The spider, or secondary mirror holder, will suspend the mirror in the optical path in order to direct light into the focuser. } 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.
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