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just a quick vid of my home made mirror grinding machine
want to learn more about Newtonian telpes the internet is replete with information about all types of telpes. Typically, the primary mirror is made of glass. Pyrex is commonly used for the primary mirror because of its thermal stability, but for small mirrors, plate glass will work fine too. Telpe mirrors are relatively thick.
Astronomy telpes and Dobsonian telpe kits, parabolic primary mirrors, secondary elliptical flat mirrors, eyeieces, barlow lenses, filters, finder scopes and Telrad sights. Telpe mirrors, equipment for astro photography, focusers and spiders, star …
Mirror Grinding. Telpe mirrors can be manufactured solely by hand in outstanding quality! In what follows here, the process of making a 14"- mirror shall be described shortly. Note: Making a grinding- and polishing machine will reduce the invested time and costs per mirror visibly in future.
Re: Building a fixed post mirror grinding machine. Update summary: Lots of work to get to this point. Things I need to probably change or fix: My gearing of the DC motor. I will need a slow speed for polishing (5 rpm), and faster speeds for hogging out and fine grinding (15- 30 rpm), so likely need to think about adding a gear reduction.
Similar mirrors are used as the 3.4 m secondary mirror of the Large Synoptic Survey Telpe (LSST) and the 4 m secondary and tertiary mirrors of ESO's ELT. Also around the same time, Roger Angel at the University of Arizona developed a way to maintain the stiffness of traditional mirrors but with a small fraction of the weight, extending ...
First, the raw glass must be cast in a large furnace. Next, the mirror must pass through the grinding, polishing, and testing operation. Only then does it travel into the integration phase where the finished mirror is mated to the telpe's cell. There, it will reside for many decades to come.
The true test of the amateur astronomer is building their own telpe. Grinding and polishing your own mirrors is a long, arduous process. Instead of …
The fabrication of this 15" F4.5 primary telpe mirror began with a planoplano blank. I used my own diamond grinding equipment to generate the rough curve here. After the generation, I poured a steel grinding tool and used #40 silicon carbide abrasive to get the mirror close to the target focal length.
Aerospace Optics and Defense Optics. Corning has a long history in producing Electro-Optical Infrared (EOIR) systems and has one of the world's largest diamond turning manufacturing operations located in Keene, New Hampshire. From design through manufacturing, Corning leverages its experience in single point diamond turning, precision machining ...
This video shows how to setup a mirror grinding machine for fixed-post grinding, also known as spin grinding or spinning. After setup, you'll see how abrasi...
Mirror grinding techniques There are many reasons for grinding your own mirror. Either you want a unusual size, or focal length, or to satisfy your curiosity, or to have the "pride of achievement" by fabricating something as precise as a telpe mirror. 300 mm Dobsonian This is my main telpe.
Once Hubble began returning images that were less clear than expected, NASA undertook an investigation to diagnose the problem. Ultimately the problem was traced to miscalibrated equipment during the mirror's manufacture. The result was a mirror with an aberration one-50th the thickness of a human hair, in the grinding of the mirror.
The machine is shown grinding a 300 mm mirror.How to build a tachometer:
The first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the tabletop in the sizes of …
I finally decided it was time to build a machine to help me grind the edges of the blanks true and round. This is my home-built edge grinding machine for grinding down my home-cast mirror blanks. Click to see the whole project. This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telpe mirror blank that I made myself.
Types of mirror grinding machines - posted in ATM, Optics and DIY Forum: Hi to all, I am planning to make a mirror grinding and polishing machine but i have limited knowledge about these machines. Because of this i have some questions to someone who has some experience with those machines; - Some machines have fixed supportes and some of them have a prestaltic moving arm, …
The GMT is essentially forced into the horrendously complex design they've chosen, because the Steward Mirror Lab can only accommodate 8.2 meter mirrors; to build anything bigger requires combining multiple mirrors. Amateur telpes, however, are MUCH smaller than 8.2 meters, and thus it's quite possible for an amateur to grind a 24, 36, or ...
Making a telpe mirror. To start, a new mirror blank is "sanded" down to create a precise parabolic curve in a process called grinding. To do that, the blank is …
US suppliers of Mirror Blanks, Grinding & Polishing Supplies, and Telpe Making Supplies. Astronomy Clubs Many can offer help with your project. Astronomy Conventions & Star Parties A good place to look at various telpes and chat with their owners. Mirror Making Courses & Workshops
Basically there are two types of grinding/polishing machine. The 'traditional' type which involves the mirror rotating at a relatively slow speed, a few rpm for a big mirror (16-20 inches) with the tool moving across the mirror, from side to side, at a higher …
Use a tool sharpening stone, wet it with water, and grind at 45 degrees, around the disc, (red arrow) . A 2 mm bevel is enough Making a tile tool "In the old days" it was usual that a mirror kit is delivered with 2 glass blanks. One as the mirror, and the other as the tool. If you have such a kit, save the second glass, and make a tile tool.
PeteDCard81, on 21 Jun 2021 - 10:11 AM, said: The Hubble primary mirror was designed to the correct specification (parameters) but ended up misshaped because of an incorrectly assembled null optics test tool. This test tool was acquired from the Perkin Elmer side of the shop that did work on Defense projects.
Grinding Machine for Large Telpe Mirrors I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work.
Rough grinding is complete for the 12.5 inch honeycomb-back telpe mirror blank. The rough grinding went pretty quickly and painlessly this time. I only have maybe 12 hours of actual work in the mirror so far. It's hard to believe, but the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15 ounces.
Mirror grinding/polishing machines for 20-inch mirrors. Interferometer benches where ACF optical tubes are tested. This ACF design produces a coma-free, flatter field of view that equals traditional RC telpes at a fraction of the cost.
Grinding 500 grit on a 25" f/3.0 meniscus mirror. Tool is a 19" glass tiled stone tool with about a 3" overhang and about 37 pounds of weight.
Currently manufacturing a 16″ diameter 1″ thick plate glass f3.88 Newtonian telpe mirror. Doing this with my new fixed post grinding machine built this summer. Work is progressing well, and very efficient. Started project in August 2013 and at this point I am ready to move on from 25 micron White Aluminum Oxide to 9 micon White Aluminum ...
With simple test equipment, the mirror maker can resolve and remove errors in the mirror's surface to a millionth of an inch [0.025 microns], creating a surface so large, smooth and precise that the light of astronomical objects from across the universe can be seen. "O telpe, instrument of knowledge, more precious than any sceptre."
Telpe Making Links - Supplies and Components. Where to buy the ATM stuff you will need. Wood. Apply Ply Plywood - Local distributor is Northern Jersey Reserve Supply, 2 Midland Ave., Elmwood Park, NJ 07407 Tel (201)796-3000. Birch and Maple Plywood. Columbia Forest Products - Europly and JayCore Plywood - Local Distributor is North Pacific ...
My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telpe mirrors. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Over the years, I'd been collecting motors, gear boxes, pulleys, etc. Most of them came from industrial junk yards.
Grinding Machine for Large Telpe Mirrors. Small table ElginWaineo mode: platter rotates at 345 rpm / 23 = 15 rpm offset oscillates at 15 rpm / 1225 = 122 rpm Axes separation: 42 inch mirror with 21 inch radius, 80% stroke length = 17 inch stroke; 21 inch+17 inch=38 inch axes separationElgin/Waineo vs Zeiss machine? posted in ATM, Optics and DIY Forum: Im getting ready to start the design ...
Thin Telpe Mirrors . Abridged from an article appearing in Telpe Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Part I - Grinding . For many years, amateur astronomers and telpe makers thought it essential that glass for telpe primary mirrors be at least one-sixth as thick as its diameter.
