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They keep your mirror and tool in place as you are grinding. My mirror was bigger than my tool so I made another wedge piece that fit in there to keep the tool in place when it's on the bottom. I used some crappy plywood, I would recommend a chunk of thick plastic or nicer wood - you need to clean these a lot and all the little cracks and such ...
31 The first method is by far the most popular. Grinding the curve into the mirror face …
Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telpe (e.g. F/D = 4) well suited for deep sky observations. On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon.
required paraboloidal mirror. Genera-tions of amateur telpe makers have been taught to proceed by first grinding and polishing a smooth sphere, and then to modify the sphere into a paraboloid. And therein lies the difficulty. While a spherical surface will arise somewhat naturally from normal grinding and pol-ishing action, a parabolic ...
All the Mirrors in this range come with Ronchi, Foucault and Testing Data. 300mm (12") Glass F/5 Parabolic Mirror $1480AUD 300mm (12") Glass F/6 Parabolic Mirror $1400AUD 350mm (13.7") Glass F/5 Parabolic Mirror $1800AUD 350mm (13.7") Glass F/6 Parabolic Mirror $1700AUD 400mm (15.8") Glass F/5 Parabolic Mirror $1980AUD 450mm (17.7") Glass F/5 ...
This would be fast and cheap, but a parabolic mirror suitable for a headlight or solar collector, but not for optical imaging. If the mirror is relatively slow, you can start with a flat blank piece of glass and hand grind and polish the glass, finally having it coated with aluminum.
Not only does this technique create a surface which can save time in grinding and aluminizing a glass mirror, the focal length of this parabolic mirror is adjustable, and can be implemented at a large size. In use, gallium-indium-tin alloy, which remains liquid above -4°F, is poured into a cylindrical container, open at the top.
Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.
Products/Services for Parabolic Mirror Grinding Machines. Grinders and Grinding Machines - (987 companies) Grinders and grinding machines use an abrasive that is bonded to a wheel, belt or disc to remove material and improve surface finish. Devices can be pneumatically driven or powered by a combustion engine or electric motor.
I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters generated by focusing light off the mirror, and that procedure clearly can't be used (unmodified) with a convex mirror.
Accordingly, the method is applied to the detection of large-diameter aspheric parabolic mirror online or in grinding process; the manufacturing quality …
Zambuto Optical Company is a full service custom manufacturer of premium Newtonian primary telpe mirrors from 7" through 24" diameter. Special Notice-We want to let our customers know that during this timeframe we continue to do business as usual. There may be delays with regard to shipments due to outside circumstances beyond our control ...
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 …
Topics on this page: Mirror Blanks, Grinding & Polishing Tools, Grits & Pitch, Storage Containers, Grinding Stands, and Miscellaneous Items. 6" & 8" Pyrex Mirror Blanks Patterns on surfaces and edges are mold marks, splotch on 6" is a grinding mark by the manufacturer.
$begingroup$ Also, in grinding the precision is far too low to even matter whether you're aiming for a sphere or a parabola. It doesn't matter at all. Don't waste your time making jigs. The emphasis in this stage is not on precision, but on removing glass (rough grinding) and smoothing out the surface (fine grinding).
Making A Mirror Grinding Tool By Allen Malsburry The average person would never think, "I can make my own telpe." Most amateur astronomers believe, "I can buy a better telpe than I can build." Neither is actually correct. For many decades now, amateur astronomers have been building their own telpes. ...
You can definitely grind a parabolic mirror by hand. I have seen many videos of people doing it. You start by grinding a spherical mirror. Use a pottery wheel type setup to help this process go faster. Once you have a decently shaped and polished spherical mirror you can start the "figuring" process to make it parabolic.
Lengthening and widening the stroking using mirror on top is arguably the most popular technique for mirrors up to 12 inches [30cm] in diameter. It's well described in popular telpe making books. For larger and faster mirrors, this approach has trouble achieving the deeper paraboloidal curves; zones also become an issue.
Fine grinding. A flatness in the range of 1 µm can be reached by grinding three glass blanks alternatingly against each other, blank 1 on 2, 2 on 3, 3 on 1, and so on. This will be continued with each Carbo grade. After fine grinding, one of the blanks is picked as the future flat mirror and will be polished.
Mirror Recoating. You will find a recoating price guide and and an A4 Printable PDF Form to return with your mirror (s) at the bottom of this page. One of the most important and very widely used services we offer is the re-coating of established or, coating of newly made mirrors. This service we offer is taken up from every corner of the globe ...
I bought a used mirror grinding kit from AstroBuySell which includes a 6" 25mm plate glass blank, matching glass tool, pitch, selection of grits etc. The kit appears to be a 30 year kit from Beacon Hill Telpes. The first owner had taken copious notes while rough grinding out to ~F11 (0.9mm), then switching to 120 grit and smoothing.
Some telpes use primary mirrors which are made differently. Molten glass is rotated to make its surface paraboloidal, and is kept rotating while it cools and solidifies. (See Rotating furnace.) The resulting mirror shape approximates a desired paraboloid shape that requires minimal grinding and polishing to reach the exact figure needed.
The Tools: Grinding & Polishing. You will need two tools: A hard tool for rough and fine grinding, and a soft tool, or pitch lap, for polishing and figuring. Traditionally, the pitch lap was made on top of the grinding tool. We recommend using plaster disks for tool substrates, and that you use separate disks for these two tools.
The Royal Society possesses three long-focus simple lenses of diameters 195, 210 and 230 mm, all inscribed with the signature 'C. Huygens' and various dates in the year 1686.
The center of the mirror is the most likely to be contacted by any motion, so it is abraded more frequently and becomes the deepest point, while the edges are worn less. The distribution between "less" and "more" is spherical. I can at least understand the process of grinding or lapping a surface flat.
concerning grinding, lapping and polishing, the essential optical manufacturing methods. If high heat load has to be applied to the mirrors, the bulk material needs to have better heat conductivity than the materials mentioned before. In this case, metal mirrors are used if the heat load is not too high. The materials used in these applications are
Parabolic-mirror-grinding machine. Country Status (1) Country Link; US (1) US1171174A (en) Cited By (6) * Cited by examiner, † Cited by third party; Publication number Priority date Publication date Assignee Title; US2660840A (en) * 1950 …
A mirror blank is ready for grinding in this image. A layer of grit and water will be added to the top of the blank before the machine is turned on. Waite Research. The artistry .
Grinding and polishing the mirror is the most difficult part of making a telpe. And the most critical. 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. Especially when the mirror gets big.
in my experience from grinding and polishing a 6" f8, and from reading a lot about it, the natural random motions of grinding and polishing two pieces of glass together will naturally result in a spherical mirror. to make it a parabolic mirror involves, i read, not very much more polishing, a couple of minutes maybe, if done in the right motions. a spherical mirror has a …