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Made of 1/4" plywood. Mirror Cell So, a better mirror cell was constructed out of a pair of 1/2" aluminum plates, and is a true 18 point floating cell arrangement. It doesn't need a fancy flotation cell, a … I called the emergency phone for the cell phone tower (whose access road we share) to alert them that the road was blocked and could only be cleared by a professional. Easiest would be to replace the triangle/edge support units with a single piece of plywood ala Stellafane mirror cell still using the bottom portion of the current cell and collimation hardware. Please drop us a note if you would like your event listed. I continued with parabolizing strokes. 06.06.2014. With this new cell in place, air can move more freely around the primary, through the tube and out the focuser-end. The eraser tips that keep the mirror from flopping forward should probably be replaced (this cell design is typical of John). # INCLUDES 3 SCREEN PROTECTORS! The other option is a mirror cell like those from Aurora Precision, called their EQ cells where there are 6 points of support around the edge of the mirror. Mechanical Stellafane East is home to the more recent McGregor Observatory, built between 1986-1991, which boasts a 13" Schupmann telescope, a domed observatory built in 1994, the Flanders Pavilion, built in 2005 and named after founding club member Ernest Flanders, as well as the "Aphitheater" hill presentation area and other buildings on the eastern site. The mirror optics for the telescope were ground and polished from raw materials furnished in a kit sold by "Precision Optics", a company then located on 163rd Street in the Bronx. Some hold the mirror in place with clips that project over its surface and introduce image-harming diffraction effects. The eraser tips that keep the mirror from flopping forward should probably be replaced (this cell design is typical of John). Many telescopes have mirror mounts that are less than ideal. Lefevre’s mirror cell calls for oak lumber. The mirror cell is very simple - Hi all, I have one of Tom Noe's amazing Teleport 10's (number 11) with a beautiful Zambuto thin mirror, and … The planet Venus is a hellish and inhospitable world. Stellafane 2008. Greg Mort For Mort, who is a widely acclaimed artist and a telescope maker himself, the discovery gives a rare peek at the hobby's origins in America and the craftsmanship of Porter, its famous prime mover. I used same 3/4 inch marine ply which I used to make the DOB mount. Pyrex/borofloat/supremax is prized for its low thermal expansion. Mirror Cell – Layout ... A schematic reference dobsoniab the mirror cell design. Report Save. Think I have been over complicating something. 1.) I had the idea that it would also be moved it laterally left/right and forward/back, however reading something on Stellafane it says there is only tilt, not lateral movement. 05 Monday Aug 2019. The ball tip and conical depresion in the back of the fiel mirror cell define the location of the field mirror with respect to the objective. The push-pull collimation system is made Stellafane-style. Paint works well, but some people prefer a dark stain followed by a coat of sealer. rod cells are stupid. 2.) Vertical slats are 3" wide. 3. Click to read about the New Registration Process. The question is whether to continue figuring the mirror or to be happy with what I have. Links to World Wide Mirror Class Listings. ... Newt for the Web (Stellafane). You will need two pieces, one the diameter of your tube and the other the diameter of your mirror. Note that if you plan to make plywood tube rings later, the inside waste from these are ideal to use for your mirror cell. New Registration Plan for 2008 Should Reduce Paper [2007-Nov-09] The Springfield Telescope Makers plan to make more use of on-line information and print less paper for the 2008 Stellafane Convention. I originally simply replaced the oak he called for with maple ply. Do Nylon work just as well? Kit makes a great 6 inch F/8 Dobsonian telescope. You know you have two kinds of cells in your eyes, you have the cone cells, the lady bird beetle cells I call them. They come there to discuss the design, manufacture and the ins-and-outs of telescope making. The page talks about focusing on something nearby (~1000 ft) as well as something further out (~1 mile+) in order to determine the proper placement of the mirror. For me, these were the two most significant demos at the 2019 Stellafane Convention in Springfield, Vermont: (1) Silvering large mirrors, no vacuum needed We had a demonstration by Peter Pekurar on how to apply a layer of Silver (metallic Ag, not aluminum) onto a telescope mirror, accurately, with a protective, non-tarnishing overcoat, that works… Stellafane sits on roughly 90 acres of land that is known as the mecca for Amateur Telescope Makers. A satin, non-glossy polyurethane is a good choice, but oil sealers also work and are typically less reflective. eTECH Collection 3 Pack of Mirror Reflected Style Screen Protect # Protector looks and works like a mirror when the screen is shut off (locked). Where I diverged most was in the so-called tube cradle, which I replaced with my adjustable curtain-track trunnion system. The spider and secondary mount began straight from the stellafane site but evolved as I chatted with my expert advisors. I used a Novak mirror cell and an astrosystems spider and secondary holder. Do these perhaps have another name? The 95-cm Boller & Chivens telescope, with its primary mirror cell removed (in foreground), towers above the elevating observing floor at Princeton's FitzRandolph Observatory. The Mirror: Grinding, Polishing, Figuring. After four hours of using the ring tool with 60 grit, I sufficiently reached the goal-spheroid of FL 78″ that we decided to move from ring tool to tile tool. Of the tube components we need to have (primary mirror cell, diagonal holder, spider, vane or stalk and focuser), the primary mirror 8¾" f/6 (David Hinds mirror). Posted 28 August 2020 - 11:40 PM. In September we attempted to get a tumble-down jig up to speed. The event is known as "Stellafane" and is held near Springfield, Vermont. I have put it up for sale because collimation was an issue. For under $30 I received a mirror cell that was sure to allow proper ventilation. A mirror holder or cell will hold the primary mirror safely inside of optical tube. Much, much better at holding the mirror from flexing in different orientations and holding collimation. Definitely the biggest solid tube Dob I would build. The primary mirror support is a mix of simple and clever. I built a 10” f6 less than a year ago. Paint works well, but some people prefer a dark stain followed by a coat of sealer. A New President and Vice-President among others. I had the idea that it would also be moved it laterally left/right and forward/back, however reading something on Stellafane it says there is … The mirror cell (here face down) is backed with a toothed sector that let Porter control its tilt from within the den of his house. A little thinner than that is fine usually, but not a whole lot thinner; with thin mirrors you could simply use a mirror cell with more support points (6 or 9 instead of 3). It is the older model. Posted by gfbrandenburg in Uncategorized. This is a reasonably thick 10 inch mirror. A Hike to an historic high point. Small blocks used at connection points are 3/4" square x 3" long. The telescope is carried on a massive equatorial mounting that was the Boller & Chivens standard for a 40-inch reflector. Mounted and ready to go to Stellafane. (1) we traced the circumference of the mirror over a mat of porcelain tiles and cut the mat into the circle with a wet saw. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. … 22-inch f/3.6 Type 2 Ultra-Portable (With DSC encoders fitted) 10-inch f/6.4 with David Hinds Mirrors. Astronomy Conventions & Star Parties. Parabolizing 1. From Ring Tool to Tile Tool. This free windows software can help you design a “perfect” mirror cell. It mentions using brass shoulder washers to secure the mirror. This is a reasonably thick 10 inch mirror. After forty-five hours of my “pushing glass,” the experts declared the mirror finished once it reached 1/6 wavelength through Foucault testing. at the Stellafane Mirror Class (October 2002 Stellafane Mirror Class) Telescope Making Workshops and Seminars. Does a mirror cell ONLY adjust the tilt of a mirror in left/right and forward/back tilt. The black spokes in the mirror cell are made out of one piece of 3/4 plywood. Share. I think I could give you a copy of PLOP if you want. The Telrad that was on it is also included. Paul is pictured here on a lunch break from coaching our students in November and enjoying some solar viewing. If you look at the lady bird beetle in the palm of your hand, you put her picture on your fovea, and that's full of cone cells and they're very sharp. Basic Kit includes a high-quality Parabolic Primary Mirror with Matching Secondary Mirror, 4-vane Spider with Diagonal Holder, 1.25 inch Focuser, 25mm Kellner Eyepiece, and a 5 X 24 Finder Scope with adjustable mount. Printed in Reflections: September, 2008. Others have adjustments that require tools or are so frustrating that observers rarely … This set up permits from between a 30 to 45 minute wait before using the scope. The 2021 Stellafane Convention was held Aug 5-8. Stellafane Convention Homemade Telescopes on display on Breezy Hill at the Stellafane Convention. In the center you will see an aluminum disk with a black knob. A wooden mirror cell also needs to be darkened, but also should be sealed against moisture intrusion. I have recently bought a nice Orion Optics UK 150 mm Newtonian reflector. I cut two disks, one 150 mm (mirror dia)… Very light. Dobsonian Mount. 2014 October 01. It is at the max of portability for myself. You may choose to buy or build a primary mirror cell. The mirror is usable but would be improved with recoating. 6-point primary cell with four safety bolts RTVed to back of mirror, ±45° edge support; Curved spider, helical focuser, and red-dot 1X finder; Variable iris focuser baffle, black velvet-covered Kydex secondary baffle, hinged protective mirror-box cover held open with rare earth magnet catch, and black velvet mirror-box deck. Andy helped cut out the Mirror Box and Top Cage in his basement shop. # Very easy to clean since it is oil resistance # Shield against dust, scratches, and waterproof. Link to the Stellafane Mirror Class. A strategy: to do a star test. Paul Valleli is an internationally recognized optical engineer who is a giant in Amateur Telescope Making. PLOP Automated Mirror Cell Optimization. The mirror we will use in our sample scope was made at the Stellafane Mirror Class by the author, and we certainly encourage people to make their own telescope optics. And if there were a barn owl sitting on one of these trees It has the enclosed end cover with collimation nuts. Stellafane (Latin for shrine to the stars) is the name of the clubhouse built by the Springfield Telescope Makers club of Springfield, Vermont in the early 1920s, and has since come to refer to the club's land and buildings on the summit of Breezy Hill. I cannot find brass shoulder washers anywhere. My library Thermodynamics Overview and Basic Concepts Spacetime and Geometry An Introduction to General Relativity . Does a mirror cell ONLY adjust the tilt of a mirror in left/right and forward/back tilt. It’s been quite interesting up here at Stellafane. 8d. Some turned down edge led to some tightening of the amplitude of the strokes. Mirror Cells Mirror Cells for Amateur Telescope Makers Johan Vanbeselaeres Mirror Cell Design Help Coulter Makeover Part 1 - An Easy to Make Six Point Mirror Cell Schmidling's Mirror Cell PLOP Mirror Cell Design 8 Inch Mirror Cell CCD The Audine Project Cookbook CCD camera Home Page Kodak: Solid State Image Sensors The Telrad that was on it is also included. Stellafane 2019 So Far. It has an average surface temperature of 737 K (464 ˚C, 867 ˚F) and pressures that are approximately 92 times the sea level pressure of Earth, roughly the equivalent of 900 m (3000 ft) underwater on our beautiful blue planet. It doesn't need a fancy flotation cell, a three point mount would be sufficient. In making the mount, I by and large followed the instructions on the Stellafane site. I’ve seen demos of a really nice DOuble pass autocollimation test. The sample we will build is a 6-inch f/7.5, however the plans can be scaled down to 4-inch scopes and up to 10- or 12-inch scopes of various focal ratios. Legions of amateur telescope makers travel to Breezy Hill in Springfield Vermont. Silvering Mirrors, and More, at Stellafane. Springfield is where the art of telescope making got its start in August 1920, when 15 men and one woman signed up to learn how to grind their own mirrors … A 12vdc fan halps cool the mirror before an observing session. You should make a good quality, sturdy mirror cell to prevent any damage to the mirror. Finishing Our Mirror Cell In regular visits through the winter I began the grinding, polishing, and figuring the mirror blank to astronomical standards. Flexing Spheres Into Telescope Mirrors sky and telescope 2000 vol 100 n 5 dialnet, reflecting telescope wikipedia, ... stellafane atm mirror making myths, amazing physics toys that will surprise you, stellafane links page, ... forum cloudy, a simple double plate mirror cell for your reflector, 48 04 vacuum flex I love it. The telescope above is now sold but I have several other mirror sets available to construct similar telescopes:. 03.06.2014. I used the parabolization stroke for thirty-five minutes and moved from strong spheroidicity to 2/5 wave. November Election News. The Stellafane Observatory is an astronomical observatory in Springfield, Vermont, founded in 1920 by Russell W. Porter.The Pink Clubhouse was built in 1923 at the site by the Springfield Telescope Makers Club. A satin, non-glossy polyurethane is a good choice, but oil sealers also work and … # Self Adhering surface and leaves no sticky residue when removed. Optics: Spider and Secondary Mount. The mirror is mounted to a length of dowel. But does not have locking nuts. The mirror is usable but would be improved with recoating. Just plug in the numbers, and in seconds, you have a mirror cell design. This is a simple, yet effective tool for newtonian telescope design. Primary Mirror Support. All of the bearings work smoothly. Think I have been over complicating something. A 6:1 ratio blank can likely be supported by 3 dots, if well placed. In the center of the mirror cell you can see a round disk of aluminum with a black knob on it. A wooden mirror cell also needs to be darkened, but also should be sealed against moisture intrusion. ... Another excellent source of info for mirror making is the Stellafane website. The cell sits on two pieces of 2″-wide plywood with angled steel bar running along the sides and in which the plywood rests (or is reinforced, depending on how you look at it). 100 Years after Porter, STMs Ascend Hawks Mountain again. The undreaded 3/8" holes are for the micrometer screws that bear on the vee-groove and flat surfaces on the paddle arms of the cell. Although the amateur telescope competition and display is still held on the original site around the clubhouse, most of the convention activities since the 1980s have taken place at Stellafane East, an annex to the original land about 0.25 mi away. Reply. Many activities at the annual convention are oriented to­wards Amateur Telescope Makers: Mirror Making and Telescope Making dem­on­stra­tions, Technical Talks, en­cour­age­ment to Display Home Made Telescopes on Breezy Hill, and Mechanical and Op­ti­cal Competitions for home made telescopes. Next I built a cell using Mike's tee bar cell support concept. All you have to make is the tube, base and mirror cell. 03 Saturday Aug 2019. ≈ Leave a comment. Stellafane External Links provide links to related information on Amateur Telescope Making, Mirror Making, Optics, other Astronomy clubs and local … Google Books Search the world's most comprehensive index of full-text books. A bolt runs up the dowel and out and through a hub that is a milled cube of aluminum. Parabolizing 2. Mirror box is 1/2" Plywood, with 2x2 frame inside. 10" f/7 (Henry Wildey mirrors). Scroll down for Events or News from Other Years. In this section we will show you how to build a complete Dobsonian Telescope. Easiest would be to replace the triangle/edge support units with a single piece of plywood ala Stellafane mirror cell still using the bottom portion of the current cell and collimation hardware. . For an 8-9:1, you'll need a 6-point cell, which is not hard to make. The silver colored background is a 1/2 aluminum plate. All of the bearings work smoothly. Those cells do not use "glue" but rather more points of edge support so that as you rotate the mirror, cell and OTA the support comes from the next closest edge support roller which because there are more rollers they are closer together … Aug 28, 2016 - Remounting your Newtonian reflector’s primary mirror could lead to better performance and easier collimation. Due to the tracking equatorial platform design that the telescope is mounted on, the hemisphere surface acts not only as the tube bottom but is also an integral part of the pointing and tracking surface. Rings are 2" wide. Hosted by the Springfield Telescope Makers, Stellafane means "shrine to the stars." The 2022 Stellafane Convention will be held July 28-31. And that it did. gkfBTz, nKQrHWv, NBPmzn, JtPSUUo, rOyjY, mvKm, jLq, NJOEb, uNZ, JbfnQJk, lCZRVwz,
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