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Above youll find an interactive 3D rendering of the Sketchup file I used to design and cut all of the parts for my telescope. Let me see if I am able to collect all the parts needed. (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.) 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. Two inch internal diameter drawtube. I bought a 4" PVC Sewer pipe cap, used a hole saw to cut a 2.25" hole then attached the helical thing to the PVC cap. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". Perfect for astrophotography or during high power planetary observation. I have no idea how much mail this idea will generate, so I can't Sh2-169 and Sh2-168, IC5146 Cocoon Nebula, Caldwell 19, Sh 2-125. Download and unzip. I had some carboy caps that make good knobs. I am working on a diy focuser design for my 6" F/8 telescope and asking suggestions for simple focuser. 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. that is a great website that guy has some fantastic photos. Contact cement is permanent, so the only solution would be to replace the tube! on Step 3. Similar photos at http://www.telescopegeek.com/gallery.htm require 100+ minute exposure times on his 20" telescope and $3200 camera. 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. Their step by step instructions were invaluable to me as I built this scope. My homemade motorized telescope focuser for Celestron C8. crafts, science & engineering, design, and technology. To test the concept I used a short piece of two inch PVC for the draw tube. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! As the telescope tilts toward the horizon, the mirror must be supported on its edge. The plastic will ride on teflon pads, creating just enough traction for the telescope to avoid sliding on its own while not making it too difficult to point at things in the sky. Every primary telescope mirror has a fixed focal length thats usually 4 to 6 times the width of the mirror. After waiting for the contact cement to dry to the touch, and with my wife's help, I carefully aligned the edge of the veneer with the guideline on the tube and pressed the first inch together. Measure the diameter of the exposed shaft. Crayford focusers are considered superior to entry-level rack and pinion the bearings, totally eliminating any flex. Use the externalMirror Edge Support Calculatorto decide whether to use a two-point, four-point (whiffletree), or sling support. The focuser is very smooth. These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. This is because my router bit was inch and the arc would be cut by the outside edge of the bit (where the circle had been cut by the inside edge.) 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. I waited until dark and pointed the scope at the sky. Save over 40% off the annual cover price for a full year (4 issues) of Make. It's rigid, lightweight, and DIY Craford Focuser. And bolt to scope Telescope Focusers | Orion Telescopes: Shop Be creative! So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. It doesn't. A tilted focuser will have no effect on the image quality. We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. Building Your Second Homemade Telescope - Part 1 - HubPages Membership connects and supports the people and projects that shape our future and supports the learning and hope it doesn't fall off The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. 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. Two inch internal diameter drawtube. This Instructable describe the planning, design, and parts of the scope, as well as the process of building The scope. Helical is one of the option i am considering. spambots that search the internet for addresses to send junk mail to.) I welded mine from steel square tubing. The mount and tripod are pretty much useless for astrophotography. 10 years ago Slide the eyepiece into the focuser and try it out. really stiff and light for their size, and even though a #2 is pretty After you've done that, put a couple of tiny pan-head screws 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. Picture of DS-4. Once the pieces were cut and I held them around the tube, I decided to cut them a bit smaller because the extra space was too much. 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. telescope page, I wasn't really eager to buy two commercial Crayford To view, go here: http://emediadesigns.com/focuser/ I ordered the focuser, received an immediate email confirming the order, and it arrived two days later. This combination has proved to be effective for all positions except when the tube is pointed directly up. At this point, the scope was pretty much finished. #@$%^#@!!!!! You should now be able to drill the 4 holes at each corner. The focal length of the mirror is 61 inches. Able to shift heavy loads of kit ie over 1000g. Today I purchased what is called atank nipple in India. Just to make sure I liked the stain, I applied some to a piece of scrap wood. I am thankful to enjoy the inspiration, and the details, that you provide, as I will soon be constructing a Dobsonian Telescope. I marked the spot and moved things back inside to install the mirror. 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. Several of my Recent Images have been focused with this system. The box should be deep enough to allow the mirror box to swing all the way down. with a genuine question or comment about the design. forces the knitting needle against the drawtube and the drawtube against The focuser shaft on the telescope is 13.1mm in diameter. 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. Build a Backyard Dobsonian Telescope - Make: DIY Projects and Ideas for His project is very well documented. With an outer diameter of 14 3/16, I cut the Tube Box sides 15 5/8 and 14 5/8slightly less than my extra inch extra on each side. Since these focusers were going side-by-side on a binocular I had talked with their owner about mirrors and mirror cells once, and I was very impressed by his knowledge of telescope building. I did not wrap the tube until I had completed the base. You should watch (and bookmark) this video. Thicker walls also required thicker side bearings so that the outside of the bearings would line up with the outside of the rocker sides. The original Crayford Focuser is on display there. Thanks Pinbout for sharing your design. This motor is available on Amazon. This is where you will use screws to strongly attach the focuser onto the tube. I had the thought that as long as I was going to build it I should build it as big as I could afford. I feel it is a wonderful thing to free oneself from the "store-bought" world, as Tombaugh did, and to use your imagination and skills to develop your own, personal way of viewing the sky. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. 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. Orion Dynamo Mini for powering a Nexstar 6SE? Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested. I had already made a lightweight focuser for Step 4Attaching the Side Bearings and assembling the Rocker. Subscribe to the premier DIY magazine today, Community access, print, and digital Magazine, and more. Im quite happy with the result, and the view in its large mirror is phenomenal. on Step 1, Richards in our local astronomy club. I began building it in the spring of 2008, but the bulk of the work was done in July of 2008 with first light occurring on July 25. 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. 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. The wide square footprint would make it pretty stable when mounted to All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . I am using scrap upvc pipe material. One of the neat things about the square design is that the 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. Our websites use cookies to improve your browsing experience. 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 phoned in the order in the last week of February and was told that it would take about 4 weeks to deliver the mirror. 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. 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. We use cookies to continuously improve our websites for you and optimize its design and customization. Have you made any mods on it since you built it? This means you lose much of the night's images. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. Low, or Zero slop when changing direction. think that design would be rigid enough under the weight of a diagonal I was concerned that it would be difficult to find, but I was able to order it from a local woodworking shop. 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. Topics such as The Focuser and other items: (Scope Stuff). I think I got what I wanted and seems best solution for me. I called in the order and explained that I would be using a mirror two inches thick. At their suggestion, I also ordered a 2.6 inch secondary mirror. While I will freely admit that most astro-photography is WAY beyond me, you certainly do NOT need a $3200 camera to do so. There are some test sketches in the "Tests" folder, start with those. Make the drawtube longer than you think you'll need, just in 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 was annoyed to have made the mistake, but very glad that I checked the position on stars before wrapping the tube in veneer. I had designed the tube box so that there would be an extra inch around the tube. A 6 in primary mirror does not have enough weight to make the dob stable. If you wanted to really go low-profile with this design, There was the expense, for one, but also the Plan ahead by carefully weighing all components and approximating the center mass of the optical assembly. 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. The cage should be a hollow cylinder about wider than the mirror, with the focuser mounted directly facing the secondary mirror. Two different construction supply companies told me that sonotubes were not available with a 14 inch diameter, even by special order. For my project I needed a 14 inch diameter, and I had a tough time finding one. Having an RS trade counter 2 miles away is such a luxury! 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. wobbly knob still works, and adds character. Not sure how your toilets are built over there, but here they use what is called a tank flush valve. I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. Crayford-style design with four bearings and one driveshaft. This motor has a 5mm drive shaft. "); 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. 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. I suspected that the company was either in trouble or no longer in business. Robert Brown did an excellent video on how to work out your stepper motor requirements. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. Orion Telescope Focusers | Buy Direct and Save! If you want a Crayford focuser with a knob instead of turning the draw tube, then Jerry Oltion's designhttp://www.jerryoltixycrayfords.htm using box frames and knitting needle drive shafts is also a fairly easy build. Not sure if it is available in the USA. Primary telescope mirror aftermarket, homemade, or custom-made. on Step 1, interesting build, its just like my old Odyssey brand scope from the mid 1990's. After cutting the circles for the side bearings, I set up the jig to cut the curved edges of the rocker sides. This proved fatal for the stepper motor! Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. I started with a spacer that with a inch outer diameter. Telescope Electronic Focuser : 16 Steps (with Pictures) - Instructables 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. If you mess up, you can turn the hole into a slot, but avoid Given any mirror measurements, PLOP will provide the ideal support layout and how much distortion to expect for any number of flotation points. I'd be willing to bet that you could easily grind your own 12.5 inch next time and save some $$. Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. But -- you have to be careful that the mechanism is true and the motor does not have a load on it at any time, otherwise it will 'stall' and stop moving. This is the first telescope that I have built. When you want to focus, you just open the program and press focus. In addition, we use third-party cookies to help us analyze and understand usage. Next, attach the eyepiece and the focuser to the top part of the telescope tube. It is used to setup water outlet from overhead water tanks. 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. While round tubing is sturdy, square tubing is easier to work with. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! I Hope to give you ideas if you are thinking about building one for yourself! 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. 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 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.". When I looked at the costs, I seriously considered buying an Orion telescope instead of building my own. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. I particularly like that the design can be integrated directly into the focuser board to make a very, very simple UTA. Given that you can make the drawtube any length you "https://ssl." I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. 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.