mirror grinding paraboloid

  • Experimental and numerical simulation study on gas jet

    1. Introduction. The mirror blank is mainly used as the substrate for optical mirror coating. The shape precision and surface quality of the mirror blank determine the optical performance of the coated mirror 1 2 .The processing of the optical mirror blank is mainly based on the technology of material removal forming compression moulding and spin-casting.

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  • Making Your Own TelescopeAllyn J. ThompsonGoogle Books

    A book that has been used with great success by countless amateur astronomers this volume presents complete and detailed instructions and numerous diagrams showing how to construct a do-it-yourself telescope. No complicated mathematics are involved and no prior knowledge of optics or astronomy is needed to follow the text s step-by-step directions which also offer instruction in the

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  • Foucault knife-edge testWikipedia

    Foucault testing is commonly used by amateur telescope makers for figuring primary mirrors in reflecting telescopes. The mirror to be tested is placed vertically in a stand. The Foucault tester is set up at the distance of the mirror s radius of curvature (radius R is twice the focal length.) with the pinhole to one side of the centre of curvature (a short vertical slit parallel to the knife

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  • Parabolizing a 20" Mirror Part 2 Deepening the Curve

    May 09 2010 · The curve on the 20" quartz telescope mirror needs to be deepened from a roughly spherical surface toward parabolic. Gordon Waite shows how to

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  • Obsession Telescopes / Optics

    Chief optician James Mulherin working 1 meter mirror. 25" mirror fine grinding. OMI test rig with 25" optic. OMI test rig with 25" optic the surface of the mirror is polished from a sphere to a paraboloid using the appearance of fringes in the Ronchi test and shadows in the Foucault test. Primary mirror coatings are 96 enhanced

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  • Making a Mirror.Astronomy

    This list is what s needed for making a mirror and it s a pretty complete list so let s the stuff together and get to the work at hand namely grinding the mirror. Pull out all the parts of the mirror kit (if you got one) and put the various grits in the jars.

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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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  • Off-Axis Paraboloid and Ellipsoid Mirrors Suppliers

    paraboloidal mirror A concave mirror that has the form of a paraboloid of revolution. The paraboloidal mirror may have only a portion of a paraboloidal surface through which the axis does not pass and is known as an off-axis paraboloidal mirror. In essence an

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  • An introduction to off-axis parabolic mirrors

    mirror are focused at the focal point. This is a valuable tool for optical design because the single surface of an OAP can produce a diffraction limited image without chromatic effects. A complete parabolic mirror would focus a collimated beam at its focal point which is often not useful because it overlaps with part of the incoming beam.

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  • Off-Axis Paraboloid and Ellipsoid Mirrors Suppliers

    SORL/Space Optics Research Labs LLCMerrimack NH Manufacturer of stock and custom off-axis parabolic mirrors. Flat spherical and aspheric mirrors in ceramic glass and metal precision adjustable mirror mounts reflective beam expanders collimators FLIR test stations lidar telescopes Fourier transform systems IR lens assemblies and a LUPI-IIA interferometer.

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  • Hyperbolic / Parabolic mirror questionATM Optics and

    Oct 15 2004 · Page 1 of 3Hyperbolic / Parabolic mirror questionposted in ATM Optics and DIY Forum OK SO I know that all standard newt mirrors are parabolic which will be defined as y = z(x 2) and have a focal point yadda yadda I understand parabolic just fine I like the math Im happy But I know some mirros are HYPERbolic y= z/x. The Epsilons are an example.

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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 over the whole surface and not go too far which requires frequent rather delicate testing. The process is not the least

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  • 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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  • Stressed mirror polishing. 2 Fabrication of an off-axis

    Jul 15 1980 · A mirror has been fabricated with the shape of an off-axis section of a paraboloid by grinding and polishing a sphere into a prestressed blank. The applied stresses were then removed allowing the mirror to spring into the desired paraboloidal shape. The 36-cm diam off-axis section deviated 9.9-microm rms from

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  • New Fabrication Process of Deep Paraboloidal Mirror by

    In this paper ELID grinding and electro-forming techniques were applied to fabricate a deep concave paraboloidal mirror which will be used in Laman spectroscopy instrument. First an injection mold with paraboloid was fabricated by ELID grinding and polishing.

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  • Grinding/polishing/figuring machine for large mirrors of

    The convenient milliarcsecond x-ray optic is a paraboloid mirror with a graze angle close to half degree and with 0.1 arc sec tolerance. For a reasonable plate scale the cross sectional radius of the paraboloid should be about 510 meters. Bengre Narayana Karkera "Grinding/polishing/figuring machine for large mirrors of milliarcsecond x

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  • ParaboloidFind link

    The resulting mirror shape approximates a desired paraboloid shape that requires minimal grinding and polishing to reach the exact Reflector (antenna) (643 words) view diff exact match in

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  • Parabolic Mirror Grinding Machines Products Suppliers

    Mirrors glass grinding machine for P (5) 107b. method of producing P (4) 84i. palladium oxide coated P (6) 133a. parabolic for solar furdaces (9) 211c. for refleciingpolarized light P (6) 132f. silvering P (1) 9b. Advances in fabrication and metrology for optics and large optics Proceedings of the Meeting San Diego CA Aug. 17-19 1988

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  • Flex Mirror Notes (Longish)Google Groups

    Aug 14 2001 · of the mirror grinding experience. I get the impression from reading your their fun of polishing a mirror to a permanent paraboloid Do you consider that the most interesting part of the mirror making proccess is in figuring and that this is what "masters of the paraboloid" would

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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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  • Grinding your own mirrorHow is it possible to get

    Dec 31 2016 · Page 1 of 2Grinding your own mirrorHow is it possible to get accuracy in the nm posted in ATM Optics and DIY Forum So I have read forum questions answers on topics such as whether it is possible to use a 3D printer to design and print out a telescope mirror or design an array of paraboloids this way for a segmented design and the answers have been no the 3D printers dont

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  • mirror grinding sourceistanbul-bilder

    Rough grinding a mirror blankYouTube. The tools may be thinner but not less than 1/8th. Blank and tool are ground together using only the finest grad of abrasive. Grinding is carried on exactly as in grinding the telescope mirror (Part 1) except that two piece of glass are reversed in position frequently one on top and then the other

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  • mirror grinding paraboloidtripoly

    Rough grinding a telescope mirror. The Joy of Mirror Making Mel Bartels Rough Grinding But the shape that will focus light coming from distant astronomical objects to a single point is a paraboloid. Because the mirror s focal length is large in relation to the mirror s diameter in other words the focal ratio is large the difference

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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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  • San Francisco Sidewalk AstronomersNotes from John

    Fine grinding in this class uses a smaller progression of abrasives than normal. 100 240 400 1000. 8 wets each. A "wet" is the process of putting water and abrasive on the mirror and tool then grinding the mirror against the tool until the abrasive is worn down. Use warm water for wets 400 and afterwards. Pouring pitch lap

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  • Making Your Own TelescopeAllyn J. ThompsonGoogle Books

    A book that has been used with great success by countless amateur astronomers this volume presents complete and detailed instructions and numerous diagrams showing how to construct a do-it-yourself telescope. No complicated mathematics are involved and no prior knowledge of optics or astronomy is needed to follow the text s step-by-step directions which also offer instruction in the

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  • How to convert a spherical mirror to a paraboloid mirror

    Jun 16 2016 · How to convert a spherical mirror to a paraboloid mirror 1. Sky Telescope November 2000 131 S ince the first Newtonian telescope was made in 1668 opticians have labored (often with difficulty) to produce the required paraboloidal mirror. While a spherical surface will arise somewhat naturally from normal grinding and pol- ishing action

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  • Grinding own mirror gives you a spherical or a parabolic

    Aug 27 2012 · The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised by using special polishing strokes that changes the figure from sphere to paraboloid.

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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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  • A method for manufacturing parabolic mirrorsScienceDirect

    A METHOD FOR MANUFACTURING PARABOLIC MIRRORS By PAUL B. ARCHIBALD University of California Radiation Laboratory Livermore California A simple method is described for producing para- bolic mirrors by revolving a horizontal pan of liquid plastic and allowing it to harden into the parabolic shape which has been assumed by the plastic.

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