homemade telescope focuser

in the tube so they'll hit the knitting needle before your drawtube runs The heaviest piece is 40 lbs, and the total scope weighs about 60 lbs (not counting the baffle). Brandon Lawler is a hobbyist telescope Maker and an active member of the Central Texas Astronomical Society. Find a special something for the makers in your life. 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. I pointed it at distant trees and had no problem bringing the image into focus with all of my eyepieces. Perfect for astrophotography or during high power planetary observation. (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.) You should now be able to drill the 4 holes at each corner. 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. together tech enthusiasts, crafters, educators across the globe. To view, go here: http://emediadesigns.com/focuser/ I then attached the Ebony Star ring using contact cement. Several clamps were used to hold the pieces together overnight. $299.99 More About Telescope Focusers Sew the seam, and sew an elastic cord into the top to secure it to the secondary cage. 4 years ago The hole did need to be enlarged slightly by moving the bit within the hole , but in the end, the fit seems right. The cell from Anttler's, for which I had received a refund, had arrived. If you found some good surplus lenses, you will have made a stunningly good objective for your scope. Someone is pulling someone's leg here. But I wanted a larger mirror, and, at that size, grinding my own was not an option. If your optical train is heavy and the focuser has to bear it (see above) then this motor may be a better choice. You should watch (and bookmark) this video. The pieces were cut down to 15 3/8 and 14 3/8, allowing just under 1/8 inch on each side. Staples or finishing nails work fine, but be sure they dont bump up above the surface of the plastic. 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. weight. Here are a few photos of the "bracket", which is a simple 3D printed plate that mounts to the telescope's focuser ring, and serves as a mount for the stepper motor. His project is very well documented. spambots that search the internet for addresses to send junk mail to.) on Introduction. on Step 5, 9 years ago Because mirror flexure can distort an image, supporting the mirror properly involves building a flotation cell. Thanks for the great comment. The dimensions of the Tube Box Sides are based on the outer diameter of my tube14 3/16. Pretty dry but important! Today I purchased what is called atank nipple in India. After the second call, I received a response that it would be ready at the end of the following week. Finally it was etched in caustic soda, and anodised matt black. I have one on my 12" f/5 truss dob and the focuser knob is on the top surface of the UTA. For a while I decided that 10 inch would be the best size. Your astrophotographer friend may have included his own images from his setup. I got a different stain, tested it, and went back to work. case you need more focuser travel than you thought. Not worth the effort, price is tooo high. 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. 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. In my build, the minimum eyepiece-to-secondary mirror distance (13) plus the primary-to-secondary mirror distance (57) equals the focal length of 71, which is roughly 4.5 times the width of the 16 mirror. really stiff and light for their size, and even though a #2 is pretty Slide the eyepiece into the focuser and try it out. It's rigid, lightweight, and Trim off any unused fabric along the base. (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.) 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. 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. 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 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. So I decided to make my own, using my normal "blunder in naively and see what happens" approach to making things. There are some test sketches in the "Tests" folder, start with those. I gave them a call and they said they had one on the shelf14 inches in diameter and 12 feet long! experimented with various wires and rods and eventually decided that a Able to make myself using my own humble tools (or toys as the pros will call them!) I used a hole saw to cut a wooden plug to fit inside the So, am curious to see what others have designed and built and proud to show off here on the homage to Crayford thread. var gaJsHost = (("https:" == document.location.protocol) ? Thanks again for the 'ible. The diameter of the focuser is usually indicated in inches. 10 years ago The version number "312" here may change if Robert posts new firmware. 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. Showcasing amazing maker projects of 2022. my 12.5" trackball, but I didn't Shorter thread side will be used to attach the eyepiece. 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. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . The silly colours are mainly due to me experimenting with various clothes dyes in the anodising. All Orion 1.25" and 2" telescope focusers are engineered to provide smooth drawtube action to ensure you hit the exact focus point . Save over 40% off the annual cover price for a full year (4 issues) of Make. 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. This combination has proved to be effective for all positions except when the tube is pointed directly up. Orient this assembly to allow you to view an object on the far horizon. with a genuine question or comment about the design. I hate focusing. This one is based on the DRV8825 driver chip and a NEMA-17 stepper motor. This simple homemade device will reduce star trails far better than if the camera was mounted on a tripod alone. Put it all together After the second call, I received a response that it would be ready at the end of the following week. I told them I was on my way. 1/4" x 20 bolt, and the nylon bolt end against the smooth knitting larger diameter. You reach a point where the picture doesn't seem to change much, so you never know where the very sweetest spot in the focus is. When you want to focus, you just open the program and press focus. Plus it comes in black, so you don't need to paint it (or worry about paint flaking off it). These have slop as you change direction, you can't do fine adjustments, they weigh a ton, and can flex alarmingly over time. Two inch internal diameter drawtube. 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. Finally, I attached Keepers to the sides of the rocker at the bottom of the arcs using screws and glue. ASIAIR - Is there an easy way to load Messier catalog into Autorun? 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.". Dozens of projects in every issue covering electronics, craft, fabrication, and more, Learn tips and skill-building tutorials from experts in the maker community. This is the kind of simple off the shelf design I was looking for. It wouldn't be a two-speed design, but if I used a thin enough I call shenanigans on every picture in this post except for the the moon. It's easy to shim it to Crayford focusers are considered superior to entry-level rack and pinion The next day, I called back to ask their opinion about the kind of spider and secondary holder to order. 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. The drawings are only approximately to scale. 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. 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 turned out that they had an incorrect zip code and the package was still waiting to be sent. Thicker knitting needles would be even 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. 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 telescopes size is classified by the size of its mirror. control. 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.

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