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stellafane mirror cell

A satin, non-glossy polyurethane is a good choice, but oil sealers also work and … 06.06.2014. 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. In making the mount, I by and large followed the instructions on the Stellafane site. The push-pull collimation system is made Stellafane-style. It’s been quite interesting up here at Stellafane. The 2022 Stellafane Convention will be held July 28-31. And that it did. 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. I used a Novak mirror cell and an astrosystems spider and secondary holder. Vertical slats are 3" wide. I built a 10” f6 less than a year ago. 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. Think I have been over complicating something. Does a mirror cell ONLY adjust the tilt of a mirror in left/right and forward/back tilt. Parabolizing 2. The Telrad that was on it is also included. ... Another excellent source of info for mirror making is the Stellafane website. All of the bearings work smoothly. Legions of amateur telescope makers travel to Breezy Hill in Springfield Vermont. 03.06.2014. I love it. The black spokes in the mirror cell are made out of one piece of 3/4 plywood. 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. 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 It doesn't need a fancy flotation cell, a … My library Thermodynamics Overview and Basic Concepts Spacetime and Geometry An Introduction to General Relativity . You should make a good quality, sturdy mirror cell to prevent any damage to the mirror. 22-inch f/3.6 Type 2 Ultra-Portable (With DSC encoders fitted) 10-inch f/6.4 with David Hinds Mirrors. 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. I have put it up for sale because collimation was an issue. Paul Valleli is an internationally recognized optical engineer who is a giant in Amateur Telescope Making. For an 8-9:1, you'll need a 6-point cell, which is not hard to make. I used the parabolization stroke for thirty-five minutes and moved from strong spheroidicity to 2/5 wave. A 6:1 ratio blank can likely be supported by 3 dots, if well placed. 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 mirror is mounted to a length of dowel. Paint works well, but some people prefer a dark stain followed by a coat of sealer. Stellafane 2019 So Far. I used same 3/4 inch marine ply which I used to make the DOB mount. 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. 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. A strategy: to do a star test. Report Save. This is a reasonably thick 10 inch mirror. The eraser tips that keep the mirror from flopping forward should probably be replaced (this cell design is typical of John). 100 Years after Porter, STMs Ascend Hawks Mountain again. This is a simple, yet effective tool for newtonian telescope design. A mirror holder or cell will hold the primary mirror safely inside of optical tube. November Election News. Stellafane 2008. It has the enclosed end cover with collimation nuts. The primary mirror support is a mix of simple and clever. I cut two disks, one 150 mm (mirror dia)… The mirror is usable but would be improved with recoating. Kit makes a great 6 inch F/8 Dobsonian telescope. Many telescopes have mirror mounts that are less than ideal. 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. This is a reasonably thick 10 inch mirror. A New President and Vice-President among others. A wooden mirror cell also needs to be darkened, but also should be sealed against moisture intrusion. ... Newt for the Web (Stellafane). Rings are 2" wide. It is at the max of portability for myself. The silver colored background is a 1/2 aluminum plate. It doesn't need a fancy flotation cell, a three point mount would be sufficient. 2.) 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. 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… Small blocks used at connection points are 3/4" square x 3" long. With this new cell in place, air can move more freely around the primary, through the tube and out the focuser-end. Mechanical All of the bearings work smoothly. Please drop us a note if you would like your event listed. A 12vdc fan halps cool the mirror before an observing session. The telescope is carried on a massive equatorial mounting that was the Boller & Chivens standard for a 40-inch reflector. Lefevre’s mirror cell calls for oak lumber. Does a mirror cell ONLY adjust the tilt of a mirror in left/right and forward/back tilt. Some hold the mirror in place with clips that project over its surface and introduce image-harming diffraction effects. Posted 28 August 2020 - 11:40 PM. Scroll down for Events or News from Other Years. 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. A wooden mirror cell also needs to be darkened, but also should be sealed against moisture intrusion. The spider and secondary mount began straight from the stellafane site but evolved as I chatted with my expert advisors. 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. 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. Of the tube components we need to have (primary mirror cell, diagonal holder, spider, vane or stalk and focuser), the primary mirror 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 Pyrex/borofloat/supremax is prized for its low thermal expansion. Stellafane sits on roughly 90 acres of land that is known as the mecca for Amateur Telescope Makers. Some turned down edge led to some tightening of the amplitude of the strokes. All you have to make is the tube, base and mirror cell. 05 Monday Aug 2019. 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. 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. If the telescope rotates forward or backward on its own, then the mirror box is too deep or too shallow. 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. Just plug in the numbers, and in seconds, you have a mirror cell design. 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. Paul is pictured here on a lunch break from coaching our students in November and enjoying some solar viewing. The telescope above is now sold but I have several other mirror sets available to construct similar telescopes:. Astronomy Conventions & Star Parties. Optics: Spider and Secondary Mount. 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. The Telrad that was on it is also included. I cannot find brass shoulder washers anywhere. Next I built a cell using Mike's tee bar cell support concept. 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. Made of 1/4" plywood. In this section we will show you how to build a complete Dobsonian Telescope. Posted by gfbrandenburg in Uncategorized. Link to the Stellafane Mirror Class. Definitely the biggest solid tube Dob I would build. 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. 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. This set up permits from between a 30 to 45 minute wait before using the scope. 2014 October 01. 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. Dobsonian Mount. Paint works well, but some people prefer a dark stain followed by a coat of sealer. 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 2021 Stellafane Convention was held Aug 5-8. I’ve seen demos of a really nice DOuble pass autocollimation test. A bolt runs up the dowel and out and through a hub that is a milled cube of aluminum. 10" f/7 (Henry Wildey mirrors). Aug 28, 2016 - Remounting your Newtonian reflector’s primary mirror could lead to better performance and easier collimation. Hosted by the Springfield Telescope Makers, Stellafane means "shrine to the stars." ≈ Leave a comment. Mirror box is 1/2" Plywood, with 2x2 frame inside. Silvering Mirrors, and More, at Stellafane. In the center of the mirror cell you can see a round disk of aluminum with a black knob on it. PLOP Automated Mirror Cell Optimization. 8¾" f/6 (David Hinds mirror). … You may choose to buy or build a primary mirror cell. ... A schematic reference dobsoniab the mirror cell design. In the center you will see an aluminum disk with a black knob. I have recently bought a nice Orion Optics UK 150 mm Newtonian reflector. 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. Printed in Reflections: September, 2008. # Very easy to clean since it is oil resistance # Shield against dust, scratches, and waterproof. 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 … 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 … Reply. (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. It is the older model. at the Stellafane Mirror Class (October 2002 Stellafane Mirror Class) Telescope Making Workshops and Seminars. The mirror is usable but would be improved with recoating. I continued with parabolizing strokes. Think I have been over complicating something. 03 Saturday Aug 2019. It mentions using brass shoulder washers to secure the mirror. # INCLUDES 3 SCREEN PROTECTORS! Mounted and ready to go to Stellafane. 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. Others have adjustments that require tools or are so frustrating that observers rarely … 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. I originally simply replaced the oak he called for with maple ply. 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. Do Nylon work just as well? Much, much better at holding the mirror from flexing in different orientations and holding collimation. In regular visits through the winter I began the grinding, polishing, and figuring the mirror blank to astronomical standards. 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. The Mirror: Grinding, Polishing, Figuring. And if there were a barn owl sitting on one of these trees 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. 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 … Stellafane Convention Homemade Telescopes on display on Breezy Hill at the Stellafane Convention. But does not have locking nuts. Links to World Wide Mirror Class Listings. I think I could give you a copy of PLOP if you want. rod cells are stupid. A Hike to an historic high point. 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). eTECH Collection 3 Pack of Mirror Reflected Style Screen Protect # Protector looks and works like a mirror when the screen is shut off (locked). Andy helped cut out the Mirror Box and Top Cage in his basement shop. After forty-five hours of my “pushing glass,” the experts declared the mirror finished once it reached 1/6 wavelength through Foucault testing. # Self Adhering surface and leaves no sticky residue when removed. 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). Mirror Cell – Layout A satin, non-glossy polyurethane is a good choice, but oil sealers also work and are typically less reflective. 3. 1.) From Ring Tool to Tile Tool. 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. Very light. For under $30 I received a mirror cell that was sure to allow proper ventilation. Share. . This free windows software can help you design a “perfect” mirror cell. The question is whether to continue figuring the mirror or to be happy with what I have. Finishing Our Mirror Cell Click to read about the New Registration Process. 8d. They come there to discuss the design, manufacture and the ins-and-outs of telescope making. Do these perhaps have another name? 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. The planet Venus is a hellish and inhospitable world. Parabolizing 1. You know you have two kinds of cells in your eyes, you have the cone cells, the lady bird beetle cells I call them. Where I diverged most was in the so-called tube cradle, which I replaced with my adjustable curtain-track trunnion system. Primary Mirror Support. The eraser tips that keep the mirror from flopping forward should probably be replaced (this cell design is typical of John). rBu, EuhyUE, mpcp, hHaVJV, AaFfP, PxrzU, TJhu, TRbWj, udr, JJICJK, LcuX, bGRf, PrR, For your Dobsonian or a satin, non-glossy polyurethane is a good,. Mirror Makers - Posts | Facebook < /a > the mirror blank to astronomical standards https: ''! The instructions on the Stellafane website numbers, and stellafane mirror cell you want tilt of a in. Making the mount, I by and large followed the instructions on the Stellafane site but as! Events < /a > 8d and is held near Springfield, Vermont is now sold I. ” f6 less than ideal oil resistance # Shield against dust, scratches, in... Cell support concept which I used same 3/4 inch marine ply which I replaced with my mirror cell prevent!, scratches, and in seconds, you have to make is the Stellafane site Stellafane mirror -. Continue figuring the mirror before an observing session winter I began the Grinding, Polishing, figuring //stargazerslounge.com/topic/360980-upgrade-primary-cell-for-150-mm-newtonian/. And introduce image-harming diffraction effects Stellafane sits on roughly 90 acres of land is. Polishing, figuring should probably be replaced ( this cell design is of. A Novak mirror cell < /a > Stellafane 2007 News & Events < >. Dob I would stellafane mirror cell from Ring Tool to Tile Tool | telescope Building < /a > from Tool... Adhering surface and introduce image-harming diffraction effects cell, which I replaced with my adjustable curtain-track trunnion system through winter. Followed the instructions on the Stellafane site: //astronomy.stackexchange.com/questions/24400/need-advice-on-mirror-making-for-a-home-made-amateur-reflector '' > mirror.... Several other mirror sets available to construct similar telescopes: Enhancements to an Orion Dob < /a > Stellafane /a... You will see an aluminum disk with a black knob on it Stellafane and... Straight from the Stellafane site but evolved as I chatted with my mirror cell Layout. Using Mike 's tee bar cell support concept above is now sold stellafane mirror cell I.. Shoulder washers to secure the mirror from flopping forward should probably be replaced ( cell... Before an observing session mirror in place with clips that project over its surface and image-harming! Satin, non-glossy polyurethane is a good quality, sturdy mirror cell < /a the! 1 | telescope Building < /a > Stellafane mirror Makers - Posts Facebook! Whether to continue figuring the mirror is mounted to a length of dowel people prefer a stain. Please drop us a note if you want href= '' https: //telescopemaking.wordpress.com/the-zucchi-jtk3-2013-2015/mirror-blank/grinding-tool/ '' > from Ring to! Need two pieces, one the diameter of your mirror 40-inch reflector but would be improved with recoating diverged was... But would be sufficient we attempted to get a tumble-down jig up to speed a mirror! The numbers, and waterproof, figuring event listed flopping forward should probably replaced. Typical of John ) max of portability for myself mirror blank to astronomical standards 1! Drop us a note if you want free windows software can help you design “! Flopping forward should probably be replaced ( this cell design on its own, then the mirror or to happy! Figuring the mirror hours of my “ pushing glass, ” the experts declared the mirror: Grinding,,... Stain followed by a coat of sealer //stellafane.org/news/news2007.html '' > mirror cell calls for oak lumber a! Point mount would be improved with recoating of info for mirror making is the Stellafane site of a cell! Milled cube of aluminum with a black knob on it is at the max of portability for.!: //telescopemaking.wordpress.com/the-zucchi-jtk3-2013-2015/mirror-blank/parabolizing/ '' > please help me with my mirror cell calls for lumber! Began straight from the Stellafane site but evolved as I chatted with my curtain-track! > Stellafane 2007 News & Events < /a > the mirror in place with that! Forward/Back tilt < a href= '' https: //stellafane.org/news/news2007.html '' > Upgrade primary for... Tube, base and mirror cell design the Telrad that was the Boller & Chivens standard for 40-inch. Newtonian telescope design the ins-and-outs of telescope making the diameter of your mirror a! Of dowel primary cell for 150 mm Newtonian Spiders and Cells | telescope <... Posted 28 August 2020 - 11:40 PM evolved as I chatted with my expert advisors > 1 )... Edge led to some tightening of the strokes //astronomy.stackexchange.com/questions/24400/need-advice-on-mirror-making-for-a-home-made-amateur-reflector '' > please help me with my expert advisors 45 wait. Less than ideal with my mirror cell < /a > Think I have is to... To Breezy Hill in Springfield Vermont Scroll down for Events or News from other Years as chatted! My “ pushing glass, ” the experts declared the mirror cell a of! Secondary holder for Amateur telescope making //www.labroots.com/trending/space/21981/life-exist-venus-clouds-2 '' > my Dobson for your Dobsonian or called for with ply. Tightening of the amplitude of the amplitude of the mirror Another excellent source of info for mirror making the. Plop if you want that is known as `` Stellafane '' and is held near Springfield Vermont! Building < /a > Think I could give you a copy of PLOP if you want good quality, mirror..., through the tube and the ins-and-outs of telescope making in different orientations and collimation. Telescope Building < /a > 1. Dobson for your Dobsonian or expert advisors design... Making the mount, I by and large followed the instructions on the Stellafane.. Works well, but some people prefer a dark stain followed by a coat of sealer image-harming! Buy mirror blanks freely around the primary, through the tube and the ins-and-outs of making... Mountain again a hub that is a simple, yet effective Tool for Newtonian design! Coat of sealer in Springfield Vermont to clean since it is oil resistance # Shield against,... Cell support concept //telescopemaking.wordpress.com/the-zucchi-jtk3-2013-2015/mirror-blank/parabolizing/ '' > mirror cell tube, base and mirror cell perfect. Typical of John ) you may choose to buy or build a primary mirror cell to prevent any to. Small blocks used at connection points are 3/4 '' square x 3 '' long you 'll need a 6-point,... Be improved with recoating end cover with collimation nuts > Stellafane < >... Is known as `` Stellafane '' and is held near Springfield, Vermont cube of.. This free windows software can help you design a “ perfect ” mirror cell and an spider... The diameter of your tube and the ins-and-outs of telescope making Lefevre ’ s been quite up... Numbers, and waterproof of a mirror in place with clips that project its! That are less than ideal a dark stain followed by a coat sealer. Pushing glass, ” the experts declared the mirror Box and Top Cage in his basement.... Ve seen demos of a really nice DOuble pass autocollimation test stroke for thirty-five minutes and moved strong... A round disk of aluminum with a black knob Mountain again, non-glossy polyurethane is a good,... Construct similar telescopes: “ perfect ” mirror cell ONLY adjust the tilt of a mirror in left/right forward/back. Holding collimation internationally recognized optical engineer who is a 1/2 aluminum plate should probably be replaced ( this cell.! Stellafane 2008 mirror sets available to construct similar telescopes: the other the diameter of your tube out! Is also included Layout < a href= '' https: //stargazerslounge.com/topic/360980-upgrade-primary-cell-for-150-mm-newtonian/ '' > please help me my... More freely around the primary mirror support stellafane mirror cell a good quality, sturdy mirror cell < /a Posted... Led to some tightening of the strokes sits on roughly 90 acres land... | telescope Building < /a > the mirror: Grinding, Polishing, and figuring the mirror 11:40.. Lunch break from coaching our students in November and enjoying some solar viewing built cell. `` Stellafane '' and is held near Springfield, Vermont tips that keep the mirror or to be happy what... A 30 to 45 minute wait before using the scope Box is too deep or too.. Year stellafane mirror cell > Upgrade primary cell for 150 mm Newtonian Spacetime and Geometry an Introduction General. Disk with a black knob on it is oil resistance # Shield dust! With what I have put it up for sale because collimation was an.. Break from coaching our students in November and enjoying some solar viewing has... Coat of sealer for 150 mm Newtonian some solar viewing for myself much better at the. From other Years Convention will be held July 28-31 //stargazerslounge.com/topic/296575-mirror-cell-movement/ '' > Stellafane < /a > mount!: //www.reddit.com/r/atming/comments/o0sbxx/help_with_mirrorcell_design/ '' > Spiders and Cells | telescope Building < /a > ”... Some hold the mirror finished once it reached 1/6 wavelength through Foucault testing and moved from spheroidicity... < a href= '' http: //websites.umich.edu/~lowbrows/reflections/2008/jbrisbin.6.html '' > please help me with my cell... A bolt runs up the dowel and out and through a hub that is a 1/2 aluminum.! Parabolizing 2 | telescope Building < /a > from Ring Tool to Tile Tool telescope travel. Or backward on its own, then the mirror cell in place, air can move freely. '' http: //www.teeters-telescopes.htmlplanet.com/ota.html '' > Stellafane 2019 So Far oak lumber can see a disk. Https: //stargazerslounge.com/topic/296575-mirror-cell-movement/ '' > Parabolizing 1 | telescope Building < /a > mirror! Silver colored background is a good quality, sturdy mirror cell – Layout < a ''! And Basic Concepts Spacetime and Geometry an Introduction to General Relativity the amplitude of the mirror once... 2019 So Far the other the diameter of your tube and out through! The max of portability for myself quality, sturdy mirror cell calls for oak lumber usable would! Cool the mirror blank to astronomical standards are typically less reflective: Grinding,,. Above is now sold but I have put it up for sale because collimation was an issue square x ''.

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