When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. For a long time I've wanted to build a machine for grinding telescope mirrors. Anyone building machinery for cold-working glass should have a look at the MOM web site and plans. For grinding the back of my 12" mirror, I used an 8" disk of 3/4" particle board, glued tiles to the front with epoxy, and coated the back and sides with polyurethane. Gordon started with a 2" thick telescope mirror that weighed about 70 pounds. Follows the mirror through loading onto flatbed truck and transportation from Caltech to Palomar mountain. The weight of the glass can deform a thin mirror. Mirror-making is a hobby that has been 3D Designand Modeling plus CNC Machining. It worked great. Optical, Inc. Welcome to my channel - in this video, we will begin to make a telescope mirror from scratch! 714-484-7500 * FAX 714-484-7600 * E-MAIL newportglass.sales@gmail.com Grinding, Polishing and Figuring Thin Telescope Mirrors . mirror grinding kit grind and polish telescope mirror at home mirror blank grinding tool grinding powders ceruim oxide optical polish View Basket (0) £0.00 ex VAT View Quote (0) Register Login Four stages of preparation are required before beginning to shape the mirror into a paraboloid. Grinding and polishing the mirror is the most difficult part of making a State of the art Ion Assisted Deposition - IAD - enhances the quality of the deposited material in the ways listed in the below link. One of the hardest things is to know how to test optics, interpret Especially when the mirror gets big. 94070 3733 alcoat@comcast.net. Portland, OR 97236, Steve Swayze - and his 40-inch f/5 mirror. REDONDO BEACH, Calif., April 1, 2005 (PRIMEZONE) -- With today's dedication by Tinsley Laboratories Inc., of a new facility to grind and polish mirror segments for the James Webb Space Telescope to exacting degrees of accuracy, NASA's newest space observatory moved another step ahead. Mirror-making is a hobby that has been around for many years, and many people have put their hands to the task, but it is time consuming, requiring a great deal of skill, patience and perseverence. Ring tool. the desired parabolic curve. Grinding Machine for Large Telescope Mirrors. Preparing the Mirror Surface. Repeat with finer and finer grit sand. Our thanks to ATM volunteers Keith Venables, Tim Cowden, and Robert Kieras! Here you will find the most modern cameras and accessories for astrophotography at top prices through direct import. We manufacture telescopes and accessories such as telescope wheels, carrying cases, guiding computers, focusers, motors and motor controls and much more. We offer Telescope Blanks made from SCHOTT Suprax … A Grinding Rig WALKING around a barrel is undoubtedly a tedious procedure, but on the other hand it is the simplest method of grinding and polishing a telescope mirror. Over the years, I'd been collecting motors, gear boxes, pulleys, etc. Take time and watch our informative, instructional videos. Ive got loads of questions regarding the design so Ill just start firing away Do I need an eccentric moving tool to be able to polish a mirror spherical? mirror to improve it's Part I - Grinding . State of the art Ion Assisted Deposition - IAD - enhances the quality of the deposited material in the ways listed in the below link. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. Glass tool ground against the mirror face. Telescope Products & Services. Telescope Service is one of the leading astronomy Dealers in Europe. This is how you make a telescope mirror out of a hunk of glass: Use a sand mixture and another piece of glass to grind away the middle of a concave shape. Our State of the Art, Ion Assisted Deposition process allows us to produce hard, durable oxide optical thin films without high-temperature substrate heating. This is an 8" mirror, so the stroke overhang is about 1.3" on each side for a 2.6" stroke length. 7635 SE Deardorff Rd. Alternative Titles: Palomar Construction, Palomar Archives 2 and Palomar Archives 3 Description: Part 1 includes footage of all aspects of the construction of the Palomar 200-inch Hale Telescope. Steve Swayze has become a master at this delicate Our Telescope Mirror Coating process utilizes the latest methods in Optical Coating technology, perfectly suited for the often harsh environment of the Telescope Mirror industry. It is cheap and comes in various size (can range from #36 to #500). To be effective, the abrasive needs to be rubbed against the glass with a lot of pressure. And the most critical. Page 1 of 2 - Making my own fixed post mirror grinding/polishing machine - posted in ATM, Optics and DIY Forum: Hey guys. Building a Telescope The program includes mirror testing methods, basic optics and wave theory of optics. We are here to serve the needs of Some coatings last only a few years, while others will outlast you. around for many years, and many people have put their hands to the task, but it (3) A homemade telescope mirror can be made with more accuracy and smoothness than the mass-produced, commercial mirrors available today. Telescope makers use silicon carbide powders (a.k.a. I made my polishing tool for my 12" mirror out of three layers of 3/4" particle board glued together. Teleskop-Service is the partner of ZWO in Europe. The program is supplied on on this website. Between 1957 and 1963, SRO members produced a film that documented the progress of the construction of the telescope and observatory - from the delivery of the mirror blank for grinding and polishing in Altadena, CA, to the opening of the dome and celebration of first-light in 1963. Our Telescope Mirror Coating process utilizes the latest methods in Optical Coating technology, perfectly suited for the often harsh environment of the Telescope Mirror industry. website for the lowest prices on plate glass telescope mirror grinding kits. Dave Barosso demonstrates the technique, but to do it yourself, try to visit one of the Telescope Makers Workshop ‘s classes on Friday nights in Oakland. Here’s some videos of mirror-grinding and mirror-polishing to give you some idea of what you’ll be doing. ////////////////////////////////////////////////////////////////////////////////////////////////////. Motorized grinding wheel on the end of along boom that is anchored that is moved back and forth across the mirror face. By thinning the blank, he's lightened the mirror by about 20 pounds! email remains the same: steve@swayzeoptical.com. Please see the Buy Telescope Mirror Blanks page for low prices on plate glass mirror blanks. Please take the time to fill out this form with any questions you may have to receive a timely reply. I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. 8610 CENTRAL AVE, STANTON, CA 90680 TEL. Part 2 includes footage of the 200" mirror, its grinding and cleaning. Spectrum Coatings utilizes their technology to accommodate a wide variety of uses for the unique properties of optical coatings, specializing in front surface mirror coatings for telescopes and astronomy. We offer a range of products and services for the ameteur telescope enthusiast such as grinding powders, polishing powders /compounds, telescope aluminising services. Indeed, the coating on my very first reflector telescope looks absolutely perfect in spite of being more than 30 years old. carborundum) for this task. Many amateur astronomers still choose to fabricate their own instruments, for the pride of accomplishment, the gaining of knowled… Thin Telescope Mirrors . amateur astronomers and telescope builders who are looking for high quality These ultra-hard coatings are perfectly suited for the harsh environment that is indicative of telescope mirrors. what you see, and know what to do from there to correct the optical surface to ALUMINUM COATING 807 Rutherdale Ave San Carlos, Ca. Telescope mirrors have the smoothest surfaces ever made. Spectrum Coatings utilizes their technology to accommodate a wide variety of uses for the unique properties of optical coatings, specializing in front surface mirror coatings for telescopes and astronomy. If the mirror is a 'thin' mirror (i.e. Zambuto Optical Company is a full service custom manufacturer of premium Newtonian primary telescope mirrors from 7" through 24" diameter. Expect to return to service February 11, 2021. Recorded at the Stellafane Mirror Workshop - No Audio - Using very fine grit (Aluminum Oxide) but the same stroke, albiet with more effort and therefgore a slower pace, is used for rough grinding and polishing. Abridged from an article appearing in Telescope Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . This is my home-built edge grinding machine for grinding down my home-cast mirror blanks. This means that stroke is 1/3 length in total , 1/6 forward, 1/6th backwards. If you'd like to buy a complete mirror grinding KIT, with all abrasives and grinding tool included, please see the Buy Telescope Mirror Kits. Our State of the Art. Part 2 - Polishing This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telescope mirror blank that I made myself. We offer many types of coatings including protected aluminum and enhanced aluminum. We can supply the optics you need for your telescope. The standard for optical thin film design for many decades. For hogging out, we start with the "chordal stroke" Put the tool on the bottom, add half a teaspoon of #80 grit, sprinkle with water and place the mirror center near the edge of the tool. excellence. Our blanks have the following standard characteristics: Precision annealed material (6 Mu or … Special Notice-We want to let our customers know that during this timeframe we continue to do business as usual. Good optics are the heart of a fine telescope. A lot has changed since Russell Porter wrote those words - today the "average workman" can afford to buy an already made telescope and Dobsonian mountings are very popular. performance. And especially if you strive for Ideally, a certain percentage of the light in the image will fall within the diffraction disk diameter. The leader in precision optical mirror coatings for telescopes and astronomy. Most of them came from industrial junk yards. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirror. My Mirror Grinding Machine. For many years, amateur astronomers and telescope makers thought it essential that glass for telescope primary mirrors be at least one-sixth as thick as its diameter. A mirror mount is needed to hold the mirror during testing. Newtonian mirrors at reasonable prices. Im thinking of making my own fixed post mirror grinding/polishing and curve generating machine. We can refigure your craft. We also offer a recoating service for Sextant mirrors. Jim's Mobile, Inc. (JMI Telescopes) is a world renowned manufacturer of astronomical telescopes and aftermarket accessories for the amateur and professional astronomer. A telescope mirror is designed to form a diffraction limited image of a point source. All jobs are treated equally, from the tiniest set, to the 24", $60,000 Zerdur set. Send Off for Coating (optional, Informational Reading Past This Point) This part and all that follows … We offer a Telescope mirror re coating service for both Primary and Secondary telescope mirrors. While it’s true that the aluminized surface of a telescope mirror will deteriorate over time, there is no hard and fast rule about how long this will take. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Unfortunately, the cost of mirror grinding kits and pyrex blanks has increased significantly in recent years to the point where any savings from making a mirror versus buying one are minimal at best. Click to see the whole project. Much is also unchanged - mirror grinding techniques are very similar to those written up by Porter and Ingalls in the 20´s and 30´s. Grinding the curve into the mirror face can be done by one of the following approaches: Ceramic tiled tool ground against the mirror face. The theory behind grinding is that you can remove glass as long as you use a material with a higher hardness. Optical Thin Film Coatings - designed using FilmStar & Mcleod Concise thin film design software. Home| Capabilities & Services | Materials | Applications | Customer Service Hotline. The purpose of the preparation is to make the surface of the mirror progressively smoother. telescope. And the most critical. SUPREMAX 33 is a borosilicate Pyrex equivalent, and is an excellent alternative for telescope mirror blanks. Grinding and polishing the mirror is the most difficult part of making a telescope. Telescope Mirror Kits .COM; United Lens Company; Salem Distributing Company; There is also info at the Mirror Workshop (Astron Soc of Greater Hartford CT). is time consuming, requiring a great deal of skill, patience and perseverence. Use 1/3 mirror diameter strokes. Producing Front Surface Mirror coatings, Anti-Reflection, Beam splitter, hot & cold mirrors, dichroic filters that meet and exceed the standards of the optical thin film industry. I borrowed a few ideas from the Mirror-O-Matic mirror grinding machine, particularly how to mount the turntable on top of the pulley. Coating Status Coating tank hoist is down. Swayze

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