mirror grinding paraboloid

  • 12 Inch Telescope Mirror BlankMirror Ideas

    Apr 09 2020 · Mirror grinding 12 inch reflector telescope mirror blank 157 50 pic how i make telescope mirror blanks source for pyrex blanks atm optics and diy forum cloudy nights casting a large light weight telescope mirror from recycled glass calisphere 60 inch telescope mirror blank photographed in test Mirror Grinding 12 Inch Reflector Telescope Mirror Blank

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  • Rotating furnaceWikipedia

    A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids.Usually the objects are made of glass.The furnace makes use of the fact which was known already to Newton that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid identical to the shape of a reflecting

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  • Off-Axis Paraboloid and Ellipsoid Mirrors Suppliers

    The Photonics Buyers Guide is a comprehensive resource for verified providers of Off-Axis Paraboloid and Ellipsoid Mirrors. Profiles and contact information for manufacturers and suppliers are provided by the companies and verified by our editors. If you have updated information about any of the organizations listed please contact us.

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  • Foucault knife-edge testWikipedia

    The Foucault knife-edge test is an optical test developed 150 years ago to accurately measure the shape of concave curved mirrors is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes uses a relatively simple inexpensive apparatus compared to other testing techniques.

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  • GSO Parabolic Primary Mirror6" f/8

    GSO s parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6" to 16" and offered in various f-ratios these mirrors are made from optical grade BK-7 glass.

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  • Foucault knife-edge testWikipedia

    The Foucault knife-edge test is an optical test developed 150 years ago to accurately measure the shape of concave curved mirrors is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes uses a relatively simple inexpensive apparatus compared to other testing techniques.

    Get Price
  • GSO Parabolic Primary Mirror6" f/8

    GSO s parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. Ranging in aperture from 6" to 16" and offered in various f-ratios these mirrors are made from optical grade BK-7 glass.

    Get Price
  • Wooden Telescope Part 1 the Mirror 14 Steps (with

    The polishing stage left us with a fully polished mirror with a nice spherical surface. However a sphere won t work for astronomical purposes. We need a paraboloid. The difference between a sphere and a paraboloid is small (order of 1 micron). To achieve this paraboloid we will use the Foucault tester.

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  • An introduction to off-axis parabolic mirrors

    An introduction to off-axis parabolic mirrors . OPTI 521 Tutorial . Written by Kevin Newman . Date October 21 2013 . 1. Abstract Off-axis parabolic mirrors (OAPs) can be a useful tool in optical design. OAPs combine the achromatic and diffraction limited imaging properties of a parabolic mirror with the ability to deviate the light path

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  • Mirror grindingscope making

    A good starter size is the 150 mm (6") mirror. A 200mm (8") will also work. Most ATM books and websites recommend a Pyrex® mirror blank but in my opinion annealed plate glass is better for this first "learn and practice" mirror is cheaper it is softer and grinds faster needing less abrasives and with these small sizes the low expansion glass like Pyrex has no practical (visible at

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  • Making your own telescope mirrorCosmoQuest

    Rough-grinding a mirror blank to spherical shape is easy. I did it to an 8-inch blank. Fine grinding and polishing to a paraboloid is more difficult because you need to be careful to keep it even

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  • Parabolic mirrorIndividual and custom-made

    Depending on the material used both CNC technologies of grinding and polishing as well as diamond turning are used in the production of aspherical on- and off-axis mirrors as well as reflectors. The material is selected according to the customers needs with the range covering almost all types of glass e.g. fused silica as well as germanium silicon zerodur infrared glass and calcium

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  • opticsAstronomy Stack Exchange

    Apparently there is a way of testing a convex mirror by making it from optical grade glass and testing it through the back. The refractive part of the light path creates a situation that if you test it as a sphere or paraboloid in that way (I forget which) the actual curve you get is a hyperboloid.

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  • Obsession Telescopes / Optics

    About our mirror suppliers. Obsession Telescopes feature primary mirrors made by two of the best established and most reputable optical companies serving the astronomy community today. Optical Mechanics Inc. (OMI) supplies Obsession with 12.5" to 25" aperture mirrors. Ostahowski Optics supplies Obsession with 15" to 22" aperture mirrors.

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  • Herb s 8-inch mirrorretrotechnology

    Herb s 8-inch mirror. this Web page last updated in 2007 links refreshed 2017. He peaqued my interest in mirror grinding and in my old mirror. The computer says from the numbers it s an 1/11 wave sphere even 1/2 wave paraboloid May 2nd To The Parabola. The bottom line in going from a sphere to the correct parabola is in the numbers.

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  • TELESCOPE MIRROR MAKING HOW TO Fine GrindingYouTube

    Apr 12 2020 · In this video I am showing you how to make a DIY telescope mirror This is the second part in the series showing fine grinding in a step by step tutorial.

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  • Understanding Foucault Harbour David A. 9781623740030

    David A. Harbour presents a brilliant narrative for the Amateur Telescope Maker (ATM) on exactly how the "Foucault Test" is interpreted. Through a series of "foundation lessons" Mr. Harbour ensures the ATM understands what the Foucault Test is revealing and what to do about it as he figures the telescope mirror to achieve the perfect paraboloid.

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  • OpticsNorway s largest optical telescope

    Fine grinding with a fixed-post grinding machine The fixed-post grinding machine is simple but effective. Exerting 0.75 horsepower it makes the grinding polishing and figuring of the 62 centimeter primary and 20 centimeter secondary mirror possible by smooth movement and even distribution of stresses over six 100 mm diameter Rollerblade© wheels.

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  • Would an amateur telescope maker be able to grind a mirror

    Aug 28 2017 · The record for largest telescope made the same way amateurs use today goes to Ireland s Lord Rosse who in 1845 built a 72-inch-telescope. Mirror grinding How the Enormous Mirrors on the World s Largest Telescope Are Made Liquid mirror telescope -

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  • Grinding/polishing/figuring machine for large mirrors of

    Along the axis the focus point of the desired paraboloid is rigidly located for regular use throughout the prolonged period of mirror making. By 4 carefully chosen random motions of the tool and the substrate it is possible to derive the desired paraboloid surface. The image at

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  • An introduction to off-axis parabolic mirrors

    An introduction to off-axis parabolic mirrors . OPTI 521 Tutorial . Written by Kevin Newman . Date October 21 2013 . 1. Abstract Off-axis parabolic mirrors (OAPs) can be a useful tool in optical design. OAPs combine the achromatic and diffraction limited imaging properties of a parabolic mirror with the ability to deviate the light path

    Get Price
  • HOW TO MAKE A MIRROREl Camino College

    HOW TO MAKE A MIRROR. Four stages of preparation are required before beginning to shape the mirror into a paraboloid. The purpose of the preparation is to make the surface of the mirror progressively smoother. During grinding silicon carbide (SiC) grit is used much in the same way as coarse sandpaper. Finer grains are used until SiC is

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  • Obsession Telescopes / Optics

    About our mirror suppliers. Obsession Telescopes feature primary mirrors made by two of the best established and most reputable optical companies serving the astronomy community today. Optical Mechanics Inc. (OMI) supplies Obsession with 12.5" to 25" aperture mirrors. Ostahowski Optics supplies Obsession with 15" to 22" aperture mirrors.

    Get Price
  • Joy of Mirror Making Rough GrindingBBAstroDesigns

    31 rows · Rough grinding a telescope mirror. The Joy of Mirror Making Mel Bartels But the shape

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  • Telescope Mirror Making Part 1YouTube

    Jul 09 2012 · Part 1 of me grinding and polishing a 12.5 inch telescope mirror. I m using a home built fixed post or spin grinder.

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  • How the Enormous Mirrors on the World s Largest Telescope

    The mirror has that shape is because the entire 25 m telescope is a symmetric parabolic mirror—but the segments which are not in the center hence "off-axis"—are asymmetric pieces of that

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  • - WOSWenk Observatory Solutions

    After fine grinding the mirror has to be polished. The toolmade from plasteris the same as used for fine grinding but now carries a special polishing layer. As a last step it is necessary to change this spheroid to a paraboloidonly then a Newton delivers really optimal results

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  • diagonalAstrosurf

    It seems that even people making their own primary mirrors contend with buying diagonal mirror from commercial sources. Part of it may be that making a good diagonal is a more demanding job that grinding and polishing a lot larger paraboloid mirror which it will be used withdraw your own conclusions from it -)

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  • Rotating furnaceWikipedia

    A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids.Usually the objects are made of glass.The furnace makes use of the fact which was known already to Newton that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid identical to the shape of a reflecting

    Get Price
  • Herb s 8-inch mirrorretrotechnology

    Herb s 8-inch mirror. this Web page last updated in 2007 links refreshed 2017. He peaqued my interest in mirror grinding and in my old mirror. The computer says from the numbers it s an 1/11 wave sphere even 1/2 wave paraboloid May 2nd To The Parabola. The bottom line in going from a sphere to the correct parabola is in the numbers.

    Get Price
  • Notes from John Dobson s Telescope Making Class

    Then fine grind the mirror blank with a succession of finer abrasives to get a smoother more precise curve and to get the mirror into the shape of a paraboloid. Use a pitch lap together with a fine polishing agent (cerium oxide) to polish and smooth the surface in preparation for an aluminum reflective coat.

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  • Notes from John Dobson s Telescope Making Class

    Then fine grind the mirror blank with a succession of finer abrasives to get a smoother more precise curve and to get the mirror into the shape of a paraboloid. Use a pitch lap together with a fine polishing agent (cerium oxide) to polish and smooth the surface in preparation for an aluminum reflective coat.

    Get Price
  • Build your own telescope part 1 The mirrorThomas

    A mirror is considered finished when the differences between its surface and the ideal paraboloid are less than 1/8 of the wavelength of green light (510 nm). This means that the peak to valley distance should be less than 64 nm.

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  • Parabolic Mirror Grinding Machines Products Suppliers

    Products/Services for Parabolic Mirror Grinding Machines. Grinders and Grinding Machines(970 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.

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  • Foucault knife-edge testWikipedia

    The Foucault knife-edge test is an optical test developed 150 years ago to accurately measure the shape of concave curved mirrors is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes uses a relatively simple inexpensive apparatus compared to other testing techniques.

    Get Price