homemade telescope focuser

I had initially allowed for more of a gap, but realized once I cut the pieces and held the tube inside them that my gap was too large. One of the neat things about the square design is that the Im sorry to hear you couldn't make the contest. Fairly easy to build and could be adapted to suit any SCT focuser. I was certain not to move the jig at all before cutting the second circle. 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. This is the upper tube that contains the flat secondary mirror, Telrad finder, and focuser. I don't *do* pretty. I attached keepers 1 inches wide by 5 inches long, extending above the bottom of the arcs by about 1 inches. 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. It has a 6mm shaft. Their step by step instructions were invaluable to me as I built this scope. You should watch (and bookmark) this video. Reply Able to shift heavy loads of kit ie over 1000g. The focuser knob had two set screws. The belt and pulleys are off-the-shelf items available on Amazon. I then attached the Ebony Star ring using contact cement. Contact cement is permanent, so the only solution would be to replace the tube! I will post the pic of final focuser once ready. Dobsonians come in all shapes and sizes, from small 4-8 builds all the way up to massive 24-36 creations. The focuser 'knob' on the Celestron is just a rubber sleeve that usually pulls off easily. This resulted in a gear that wasn't true and "wobbled" a bit. It may take you a while to adjust the image correctly, but it's not hard to do, just time consuming. After looking at many focuser options with a big range of prices, I decided to order a GSO 2 speed Crayford focuser from ScopeStuff. This combination has the best resolution (steps/revolution), so I didn't see any reason to build anything else. DIY Truss Dob input: How to design truss? 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. tube and nut that fits the outside threads. 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. and an eyepiece. 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. love to hear from people who are interested in this focuser design. 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. until a 2" eyepiece or 1.25" adapter is snug. That evening I spent most of my time rediscovering the many DSOs around Sagittarius, especially the Lagoon Nebula and the Trifid Nebula. If you are (for example) doing a focuser for a catadioptric telescope like a Celestron C-8 or similar, the focus knob has no load on it so this smaller, lighter motor will do the trick. 4 years ago Some quick tips to note if you are making a homemade telescope are: 1. You need some purple bits In the "ARDUINO FIRMWARE" folder, in it you will find a ZIP file "myFP2-Firmware 312-1.zip". It interfaces to the computer via USB and comes with an ASCOM driver. I drilled holes for the screws that avoided the location of the ring, and attached the rocker bottom. The original Crayford Focuser is on display there. Here's my 8" f/6 travel scope with a 2" PVC draw tube and the helical Crayford focuser built right in the focuser board. i got a email that someone built a telescope close to mine that has seen the stuff in the photos here is a link to his site http://www.synapticsystems.com/sky/scopes/Dob.htmlif i seem a bit rude please forgive me i just spent 12hrs in a plane i have jetlag and im sitting in a airport.i would like to thank lvlasertech for keeping this instructable lively and informative. 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. haven't yet found any design elements that need improvement. The telescopes size is classified by the size of its mirror. on Step 5, 9 years ago - Bill. Next step, before my first acquisition of any parts, is to get with any amateur astronomers in Central Florida, so, wish me luck! Unbelievable! I also figured that the extra expense was worth it, considering the amount of money I was investing in the project overall. Among amateur telescopes, the most common are focusers with landing diameters of 1.25 ", 2", rarely 0.965 ", and even less often - 3". Gift the gift of Make: Magazine this holiday season! Your design is simple and nice. Cost is $25 - $30, and you will have 5 PCBs in about a week. homemade Crayford focuser. The current needs to be adjusted on the DRV8825. Just as it was about to come into focus, the focuser bottomed out. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. Not worth the effort, price is tooo high. 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! The flat wants to be running parallel to the long axis of the tube. I ended up modifying it a bit after printing. Please feel free to email me at the address on the right. If you follow the procedures described above, your telescope's optics will be perfectly aligned. Some of these are essential for the basic functionalities of our websites. Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. A Pocket Sundial From a Broken Pocket Watch! Topics such as Very simple and portable. Robert Brown did an excellent video on how to work out your stepper motor requirements. I wanted the long focal length for good contrast. I do it with aluminium alloy, aluminium tube and nice work. 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. 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. This might have been tempting if I wanted to build a 6 inch scopeat that size, they say that first-timers do pretty well at grinding and figuring their own optics. widening the hole. If you're not using heavy eyepieces, you probably don't need needle so the knitting needle will be snug against the drawtube without Thanks for the great comment. work really well, for a fraction of the cost of a commercial Crayford For about $3 we can buy a tank valve kit that has a threaded 2" i.d. Drawing lines between opposite corners of the tube box sides allowed me to locate the center point on each side. together tech enthusiasts, crafters, educators across the globe. 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting 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. 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. The sides were attached with wood glue and clamps with a few small brads to hold everything in place. This is not recommended for shared computers. you don't need to paint it (or worry about paint flaking off it). 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. Now I can simply insert the PVC cap on the end of a 4" pvc tube. focusers for that project. 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.) Participated in the Celestron Space Challenge. 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. The one company that did provide a price quoted over $500more than I was willing to pay for cardboard! 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. I did run into a small problem with the focuser. I had installed the mirror about an inch too far away from the focuser. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. installations. document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); he might just have a $3200 camera, they aren't very hard to come by. Make the hole diameter fairly snug, too. If you're going for simple, have you considered a helical focuser? Telescope Magazine. (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.) I also have an extended photographic build diary of this telescope posted on Imgur. I added three inches for a margin of error and in case I need to rebalance the tube in the future, making a distance of 25 inches from the balance point of the tube to the rocker bottom. You simply glue or screw the 'nut' part to your scope OTA, and thread the tube part in/out to focus. 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 rocker sides are each made of two identical pieces of inch plywood glued together, creating two sides one inch thick. Electronics and software automate the process of taking pictures. Edited by Pierre Lemay, 25 May 2020 - 08:10 AM. I have already seen some designs on CN, Stellafane and web but still checking if someone has recently made anything simpler. 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 Hope to give you ideas if you are thinking about building one for yourself! We moved the operation to a nearby park and got a focused image of the most distant trees (300-400 yards away) quite easily. 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. The Crayford focuser is a simplified focusing mechanism for amateur astronomical telescopes. Line the underside of the rocker box with a ring of ABS plastic to allow it to ride on the base. It stalled when tension on the belt increased. We are now ready for some testing. It took a lot longer than I expected to receive my mirror and other parts from Discovery. I file a dispute with Paypal to begin the process of getting my money back. guarantee a response, but I'll do my best to answer everyone who writes You can easily, and economically (10$) build a Crayford Helical Focuser like the one pictured above in one evening with simple tools. Make the drawtube longer than you think you'll need, just in 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. 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. 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. Knitting needles are narrow the frame. case you need more focuser travel than you thought. #2 knitting needle would be just about right. Edited by sunrag, 28 May 2020 - 10:44 PM. The 48 inch width of the veneer was close enough to the diameter of the tube that I used it as is. help eliminate slippage when the focuser is pointed straight upward. 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. 5 weeks after I had ordered the mirror, I called to ask about its status. 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. After the second call, I received a response that it would be ready at the end of the following week. Most of these have one or two set screws. and hope it doesn't fall off 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. Maker-written books designed to inform and delight! As I read the book I decided that I should build a 12.5 inch truss tube scope. A neet site: http://www.astropix.com/HTML/I_ASTROP/CAMERAS.HTM Cool instructable, Dude! Install on Windows 10, this part is pretty straightforward. Since my focuser shaft is 6mm, I ordered the coupler shown here in the 6mm to 8mm version from Amazon. . Also no obvious diffraction spikes in the m31 photo. In amateur astrophotography, we run our telescopes overnight. This focuser (see pic at bottom) was motorised by me several years ago, but the motorised system didn't give me very fine control, and the motor running at fast speed tended to make the Artemis camera crash. During assembly, youll attach the trusses to the mirror box, then sit the secondary cage on top and bolt everything in place. 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. ASIAIR - Is there an easy way to load Messier catalog into Autorun? Total cost for supplies for this project: It took a lot longer than I expected to receive my mirror and other parts from Discovery. So, for my telescope I used a 6mm to 5mm coupler available on Amazon. This is the kind of simple off the shelf design I was looking for. (actually, it ended up a smidge more than 2 inches). 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. Since my plan called for purchasing the mirrors and mechanical parts there were several decisions to be made and several vendors to contact. the bearings right at the edge of the frame, reducing the frame to 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. in the tube so they'll hit the knitting needle before your drawtube runs Quick demo of my motorized focuser, and I will create a detailed tutorial if enough people are interested.

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