There are sub-folders for the different versions. I Hope to give you ideas if you are thinking about building one for yourself! Im sorry to hear you couldn't make the contest. The focal length of the mirror is 61 inches. Using plywood, make 4 attachment blocks to pair the trusses together and create a small ledge for the secondary cage to rest on while you secure it. I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. This cost around $100 to build and all of the components came from Jaycar, except the brackets which were made with 1.2mm sheet metal. 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 installed the spider first, about one inch down from the end of the square end of the tube. The focuser is the part of the telescope that holds the eyepiece or camera, and by moving in or out, closer or farther from the . I file a dispute with Paypal to begin the process of getting my money back. I like the old way of using stepper motors and other stuff introduced years ago by Mel Bartels, he is a master for me. Most of these have one or two set screws. I told them to take their time and get it right. 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. Attach the eye piece to another cardboard piece and pass it through the hole from the inside of the tube. I decided to keep this tube for now and if I run into problems with it, I can replace it later. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . 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 Download and check them out, I just grabbed the first one and printed it. It has a 6mm shaft. 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. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. Position "0" is with the focuser all the way IN (at least for a refractor). I am a retired USAF electronics engineer, and might even do much of the construction of the base with welded structural tubing, as, I do have a complete metal working shop besides my wood shop, here. Wooden Telescope Part 2: Tube and Mount - Instructables Look down through the empty 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. In the sub-folder "Cases" you will see many variants of the case for the DRV8825 based focusers. Stellafane The Focuser I was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. 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. the side of a rigid secondary cage. 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. Shorter thread side will be used to attach the eyepiece. If you mess up, you can turn the hole into a slot, but avoid Telescope Focusers | Orion Telescopes: Shop It is size 1.25 inch with a clear inside dia-meter. More Homemade Refractor Telescope DIY Erecting Prism Binoviewer Focuser here: Did you make this project? If you don't want to go that route, contact me at gary.hethcoat@gmail.com since I have a lot of spare parts and I can sell you a "kit" with a PCB and only the parts you need. Only problem is if I put a diagonal it wants to rotate the helical part. Fairly easy to build and could be adapted to suit any SCT focuser. Find a special something for the makers in your life. the bearings, totally eliminating any flex. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. It was easy enough to drill a hole and tap threads for a When you're ready to go on to testing with the windows driver, you want "myFP2_DRV8825_312-1", open that folder. But let me see what items I can arrange to make a helical. Before you do this, the stepper motor will probably move, but it will make a 'stuttering' sound instead of moving smoothly. can't click on it or copy and paste it; it's a graphic file to thwart I had designed the tube box so that there would be an extra inch around the tube. 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. I do have another tube that can be used around the drawtube, but it doesn't really add anything. 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. 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. Now attach the screw eyes and the rubber band on the side of the board. I did not wrap the tube until I had completed the base. So, I duplicated the aluminum gear pulley in SolidWorks, and printed it out. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. The last chapter of the book describes a plan for an 8 inch sonotube dob with a few design elements from their truss design, and, as I read that chapter, the simplicity of its construction was very appealing. These will be stored in your browser only with your consent and you have the option to opt-out. curated by us, the people behind Make: and the Maker Faire. Low, or Zero slop when changing direction. Have you made any mods on it since you built it? The box should be deep enough to allow the mirror box to swing all the way down. I had some carboy caps that make good knobs. I tried this one first and found it wouldn't work for my application. My DIY Motorized Telescope Focuser - YouTube I use a 3D printer and an old gear motor to create an electronic telescope focuser.This is my first attempt at voiceover, I'm using a headset. The rocker arms must also have guides to keep it on the track; flat metal 12 braces lined with ABS plastic work nicely. was straight so I wouldn't get a wobbly knob. The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. This is the kind of simple off the shelf design I was looking for. The current needs to be adjusted on the DRV8825. an inch or so apart, so the focuser body could be pretty low profile. I also decided to make a separate mounting plate for the stepper motor, since I figured aligning the shafts precisely would be all but impossible. 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. It is used to setup water outlet from overhead water tanks. I think I got what I wanted and seems best solution for me. 7 years ago Helicals are adaptable to both refractors and reflectors, but do not "play nice" with zoom eyepieces because "zooming" becomes a two handed operation to avoid changing focus. how much travel you actually need, you can cut the tube off so none of the tube is cardboard as well, you can also get a quality mirror at telescope.com for much cheaper. Featured in the February, 2015 issue of Sky & This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. 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. you could probably space the bearings 3/4" apart instead of 1" and mount 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. Drill a hole and attach the ball head using a shorter 1/4" 20 bolt. large in diameter (1.6") so that adds to the fine-ness of the focus That's pretty much the focuser. The mirror itself must also be able to tilt in three dimensions in order to aim its light at the secondary mirror (a process called collimation). 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. Telescope Focusers | Orion Telescopes: Shop 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. The scope including the optics, truss tubes, and eye pieces all stored in a single box making it easy to store and transport by car, but it was a little too big to fit in the overhead compartment or under the seat on most aircraft. My telescope is the Orion ED80T-CF. Here is a simple 3D printed helical focuser that cost just a few cents (assuming you have a 3D printer). This cost around $100 to build and all of the components came from. Today I purchased what is called atank nipple in India. Pierre Lemay, thanks for sharing your simple and incredible design. 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. Not worth the effort, price is tooo high. They use a simple plywood mirror cell, stating that for an 8 inch mirror this cell will be adequate. When they arrived, they were beautifully and carefully packaged with the secondary already installed in its holder. 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. Also no obvious diffraction spikes in the m31 photo. I used one of the top scraps from the rocker sides to mark an angle of 70 degrees from the center of the arc to the curved cut in order to properly space 1 X 7/8 teflon pads on the arcs. The rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. Pierre's Helical Crayford gets my vote hands-down for elegant simplicity. This sure is going to be a project I will work on. Likewise, the side bearings are made of two identical semicircles of 5/8 inch plywood glued together, creating side bearings that are 1 inches thick. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. The only thing on the list that was a bit difficult to find was baltic birch plywood, which had to be special ordered from the lumber yard. 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. I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. in the tube so they'll hit the knitting needle before your drawtube runs Your astrophotographer friend may have included his own images from his setup. It took a lot longer than I expected to receive my mirror and other parts from Discovery. I A project collaboration and documentation platform. adapter set screws to slide into. haven't yet found any design elements that need improvement. DIY Remote Telescope Focuser - YouTube Edited by howardcano, 24 May 2020 - 09:29 PM. You will need to remove the regular focus knob on your telescope's focuser. stronger, but would give me a coarser focus action because of their At their suggestion, I also ordered a 2.6 inch secondary mirror. 8 years ago Nice work and great instructable! The telescopes size is classified by the size of its mirror. It's the same in form, but has a perfect, true 13.35mm hole. 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. Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. #2 knitting needle would be just about right. 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. Just to make sure I liked the stain, I applied some to a piece of scrap wood. - Bill. Homemade DIY focuser for telescope with computer control - NEUTRAL.org The overall project is super cheap, we're building this thing for something like $50 in materials. I welded mine from steel square tubing. A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! To do this, the mirror cell needs to be supported by 3 large bolts, at least 2 of which are adjustable. For the ATMer I do find that there are an endless number of parts that can be designed and printed for home built telescopes and binoscopes. Download and unzip. I even began taking careful notes about needed supplies and plans for each piece of the truss tube scope. To view, go here: http://emediadesigns.com/focuser/ One of the companies I had considered as a supplier for the primary mirror was Anttler's Optical. With Simple | Space a 3/4" thickness. I told them to take their time and get it right. The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. control. After another 3 weeks, I was concerned that I had not received the mirror. PVC pipe makes great drawtubes. Not sure how your toilets are built over there, but here they use what is called a tank flush valve. As I continued to read, however, I was struck by the many complications of the design and, frankly, how many ways I could screw it up. This is where you will use screws to strongly attach the focuser onto the tube. This makes for better sky photographs as the exposure time can be lengthened,. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! The pivot bolt consists of a 1 1/8 inch brass spacer with an 11/16 inch outer diameter, a 3/8 inch bolt 2 inches long, a stop nut, and two large washers. I waited until dark and pointed the scope at the sky. Unfortunately I don't have a 3d printer. Having an RS trade counter 2 miles away is such a luxury! Step 3The Side Bearings and Rocker Sides. A Homemade Crayford Focuser Or in my case, back to SolidWorks :-). Here is what I was working on but looks like I need a better design. You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. In amateur astrophotography, we run our telescopes overnight. 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. And for those who like to work with 3D printers, both the single speed and dual-speed versions could easily be printed. I will post the pic of final focuser once ready. Two such companies would not give me a price because the order of a single tube was too small. 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. The secondary holder is adjustable, so I could didn't have to get the location perfect. Membership connects and supports the people and projects that shape our future and supports the learning by cranking Made of plywood, the rocker box supports the mirror box on 1 teflon pads, allowing it to rotate vertically. When you figure out The balance point determines the height of the rocker sides, so I had to get this far before I cut the wood for the base. 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. I sanded all parts of the telescope with 220 grit sandpaper followed by 400 grit, making a very smooth surface to apply the stain. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. If you're going for simple, have you considered a helical focuser? It seems to 1" Rack & Pinion Focuser. exactly 2" with adhesive labels placed one at a time inside the tube Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. I had the thought that as long as I was going to build it I should build it as big as I could afford. 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'll use an aluminum tube for the finished draw tube but for now the plastic tube . 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. 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. narrow the frame. Once I had my design set, I was ready to buy the parts. Building the mirror box is tricky, because the entire optical assembly (mirror cell, mirror box, trusses, secondary cage) must balance at the center of rotation of the arms. Tom's Homemade Telescope Page - Issac Newton Scope - Google with a genuine question or comment about the design. Part numbers 351-4574 and 336-422. The focuser is very smooth. The version number "312" here may change if Robert posts new firmware. I have several of the books on building a Dobsonian Telescope. Two of the holes for the bolts were blocked by knobs. Easy DIY motorized battery free telescope focuser - YouTube (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.) If you connect the 12V power with the barrel connector (right side of photo), the Nano should light up without the USB connection. The premier publication of maker projects, skill-building tutorials, in-depth reviews, and inspirational stories, There are some test sketches in the "Tests" folder, start with those. My plan for wrapping the tube seemed good, but I am not too pleased with the final result. surfaces to put the bearings in and a vee at the bottom that would hold Fairly easy to build and could be adapted to suit any SCT focuser. help eliminate slippage when the focuser is pointed straight upward. And a couple of upright bearing blocks. Tom's Homemade Telescope Page - Udder Nonsense - Google The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. The cost is a bit more than some of the other combinations, but by only $10 or $20. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. As it turned out, the mirror cell was too large to fit into my 14 inch sonotube. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. I centered the focuser 8 inches from the top of the tube, using a 2.5 inch hole drilling saw with smaller holes for the bolts that would hold the focuser. If you wanted to really go low-profile with this design, The arc at the top of the sides needed to have a radius 1/8 inch larger than that of the side bearings to account for the thickness of the teflon pads that would fit between. Make sure the shroud can slip on and off of the assembled scope, and that it stretches along the circumference (not lengthwise). Upload that main sketch to the Nano. 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. Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. experimented with various wires and rods and eventually decided that a I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. 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. Given that you can make the drawtube any length you The shroud made from two 22 inch tall containers came out short, so I had to add an eleven inch strip of nylon. See captioned photos 22-25 here:https://www.cloudyniractor-focuser/ for more detail on building a flush valve focuser, as Bob mentions. The lumber yard also gave me a lower price than I expected. I took the whole tube assembly outside. Then it was time to stain and finish. A free program that lights childrens creative fires and allows them to explore projects in areas such as arts & I'm' glad I did, because I didn't like the first color that I had chosen. Thin-wall aluminum tubing is used to attach the mirror box to the secondary cage. accessible by all ages and skill ranges. Step 4Attaching the Side Bearings and assembling the Rocker. 10 inch or 12 inch. spambots that search the internet for addresses to send junk mail to.) I built mine entirely from CNC-cut plywood, and fastened it together with 2 bolts. Ideally, the spacer would be 1 inch long and have a smaller diameter, but I didn't get this one right the first time. Robert Brown did an excellent video on how to work out your stepper motor requirements. Our websites use cookies to improve your browsing experience. One 6in dob I made was a complete failure. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. I started by trying to drill out a metal gear for the focuser shaft. For about $3 we can buy a tank valve kit that has a threaded 2" i.d. This book describes in great detail the steps to build a large aperture truss tube dob, focusing on scopes with a 12.5 to 40 inch mirror. I will have a lot of fun building my homemade 12.5 inch Dobsonian Telescope!!! Able to make myself using my own humble tools (or toys as the pros will call them!). I was certain not to move the jig at all before cutting the second circle. To get this arc, I actually moved the radius of the jig in by 1/8 inch. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. Rather than use a sheet of plastic Kydex to finish the tube, as recommended in K/B, I ordered a sheet of birch veneer. I read the entire thread and surely its going to help me building my focuser. This will determine the size of the coupler you will use to connect the stepper motor. 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. 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. Thicker knitting needles would be even A Pocket Sundial From a Broken Pocket Watch! Thanks Peter. I've been using the above pair Built one of these http://emediadesigns.com/focuser/ working really well only cost less than 40.00. 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. Trim off any unused fabric along the base. This resulted in a gear that wasn't true and "wobbled" a bit. 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. Home centers and hardware stores did not carry large sizes. For my project I needed a 14 inch diameter, and I had a tough time finding one. It just And bolt to scope I used one of these scrap pieces to draw an angle of 70 degrees to the edge of the arc so that I could later place the teflon pads on the arcs. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. 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. This motor is available on Amazon. Crayford focusers are considered superior to entry-level rack and pinion 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. Homemade astronomy. You currently have javascript disabled. Focusers of telescopes. Types, difference, specifications - Star Hunter I marked the expected position of the secondary by measuring 61 inches down from the end of the tube. I got a different stain, tested it, and went back to work. Easy DIY motorized battery free telescope focuser - YouTube At some point in the building process, my goal became to finish the scope by RocheStar Fest, an annual event of the Rochester Astronomy Club. While round tubing is sturdy, square tubing is easier to work with. My DIY Motorized Telescope Focuser - YouTube I use a 3D printer and an old gear motor to create an electronic telescope focuser.This is my first attempt at voiceover, I'm using a headset. The mount and tripod are pretty much useless for astrophotography. Homemade Electric Telescope Focuser - Stargazers Lounge It's easy to shim it to exactly 2" with adhesive labels placed one at a time inside the tube until a 2" eyepiece or 1.25" adapter is snug. an eyepiece. I : "http://www. Plus it comes in black, so I first tried my 32mm plossl eyepiece. A week after they said they would send the secondary and other parts, I called to ask if things had been sent. on Introduction. off the bearings. 4 years ago It is named after the Crayford Manor House Astronomical Society, Crayford, London, England where it was invented by John Wall, a member of the astronomical society which meets there. I used the "LEDandBuzzer" and "TestStepsDRV8825" tests. It would cost less and they have a very good reputation. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); This allowed me to cut perfect identical circles. Share a cool tool or product with the community. Perfect for visual observations with very heavy mirrors. Several clamps were used to hold the pieces together overnight. I marked the spot and moved things back inside to install the mirror. Several functions may not work.

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