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Mirror Grinding Paraboloid

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Making an Optical Flat Mirror

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 with - draw your own conclusions from it -) Get Price

Parabolic Mirror Grinding Machines

Products/Services for Parabolic Mirror Grinding Machines Grinders and Grinding Machines - (980 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 Get Price

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 Get Price

Obsession Telescopes / Publications

My only quibble is that the authors downplay the rewards of grinding one's own telescope mirror This topic is covered in an appendix but further pride in manufacture and significant cost savings can be achieved by making your own mirror and it is not such a daunting task B 14 2 The Sphere and the Paraboloid B 14 3 Star Testing B 14 3 1 Get Price

Amateur telescope making

Amateur telescope making is the activity of building telescopes as a hobby as opposed to being a paid professional Amateur telescope makers (sometimes called ATMs) build their instruments for personal enjoyment of a technical challenge as a way to obtain an inexpensive or personally customized telescope or as a research tool in the field of astronomy Get Price

HOW TO MAKE A MIRROR

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 Get Price

How to grind a parabolic mirror for telescope ?

May 05 2010Best Answer For a first project make a mirror in the 4 to 10 range of diameter It'll take a few weekends Grinding polishing figuring and coating a small mirror in 1 day can be done but will require some experience In the US get the glass abrasives pitch and Get Price

Build your own telescope part 1 The mirror

Rough grinding This step is about making one side of the glass concave The desired shape is a paraboloid We will need to build special tools to control the shape of the mirror To go from a spheroid to a paraboloid could take from a few hours to a Get Price

drawing 3D solid paraboloid of rotation

Aug 27 2009I am trying to draw an off-axis paraboloidal mirror My strategy was to 1) create a paraboloid of rotation (3D solid) then 2) orientent that and subtract it from the mirror blank (substrate) Thus would creat a paraboloidal depression I am stuck at step 1 I used the VBA routine posted by Joro to generate the parabola as a pline Get Price

A method for manufacturing parabolic mirrors

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 Get Price

Waite Research 20 F4 5 Mirror Fabrication

The grinding sequence was 25-micron 12-micron and 9-micron then finishing with 5-micron The mirror was rough polished using high-speed fixed-post polishing on a 75% pitch polisher Rough parabolization was handled with a 40% lap to rapidly move the mirror away from spherical and toward the paraboloid Get Price

Mirror Finish Anodized Aluminum Sheet for Solar Parabolic

Mirror Finish Anodized Aluminum Sheet for Solar Parabolic Reflector Aluminum---mirror aluminum sheets Anodized aluminum sheetThe mirror aluminum sheets are aluminum sheets taking on a mirror effect by rolling grinding and a variety of methods the free A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a Get Price

After fine grinding the mirror has to be polished The tool - made from plaster - is 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 paraboloid - only then a 'Newton' delivers really optimal results! Get Price

Double

an off-axis paraboloid However the fabrication of an off-axis section of a paraboloid is elaborated due to the cubic or comatic asphericities involved Thus it is of interest to investigate the replacement of such parabolic mirror with two double-curvature surfaces the replacement with a single double-curvature surface has been previously Get Price

focusing by an arbitrary opening paraboloid mirror and its

Focusing of the plane wave with radially polarized electric field by an arbitrary opening paraboloid mirror is analyzed using a rigorous vectorial diffraction theory i e Stratton-Chu integral In the vicinity of the focus far-field approximation conditions are used to simplify the derived Get Price

OLLAR

OLLAR TELESCOPE By Robert Brightman L AST month we left you in the middle cause polishing is a kind of grinding op- _ eration with more wear taking place in fection you must polish the mirror so that it is a paraboloid-for a paraboloid as we said before reflects all-light from infinity Get Price

The shaping and testing of two 20" optical telescope mirrors

The mirrors •Two 20" (508mm) Pyrex mirror blanks imported from Newport Glass Works •Factory diamond tool pre-ground to F4 5 and fine annealed •48mm thick – classed as "thin" mirrors •Weight of 20 kg each •Had to be further shaped by grinding polishing and eventually figured to a good paraboloid Get Price

Joy of Mirror Making Rough Grinding

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 Get Price

Focusing properties of spherical and parabolic mirrors

Focusing properties of spherical and parabolic mirrors 1 General considerations Consider a curved mirror surface that is constructed as follows Start with a curve denoted by y(x) in the x–y plane that is symmetrical under a reflection through the y axis i e y(−x) = y(x) Get Price

MIRROR MAKING December 2014

When ready to make a concave surface on the mirror you will need to have the mirror-blanc and grinding tools and grinding grit use also a equal size(10% larger or smaller works fine) glass tool-disk and grind-polish with the mirror on top making circular strokes with (1/3 min of mirror overhanging during hogging) this produces a concave spherical sagitta surface Get Price

The venerable craft of To some optical astronomers the

telescope mirror grinding takes on a modern cast All changes all is very much the same To some optical astronomers the beauty of their science is in the in creasing sophistication with which they can manipulate and extract infor mation from the star-born photons gathered by their giant telescopes (See An Astronomical Revolution Mosaic Get Price

Would an amateur telescope maker be able to grind a mirror

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 - Get Price

Grinding/polishing/figuring machine for large mirrors of

Grinding/polishing/figuring machine for large mirrors of milliarcsecond x-ray telescopes of 21st century 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 the focus point of the desired paraboloid is rigidly located for regular use throughout the Get Price

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 5 - 10 meters Bengre Narayana Karkera Grinding/polishing/figuring machine for large mirrors of milliarcsecond x Get Price

Melting Glass for a Telescope Mirror woahdude

This mirror was made for the giant magellan telescope while the back is also for support the hexagons actually individual actuators that precisely control the curvature of the mirror at nanometer scale Over the entire span of the mirror the height variation cannot be more than half an inch difference Get Price

Stressed mirror polishing 2 Fabrication of an off

Abstract 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-μm rms from the polished sphere Get Price

Making Your Own Telescope

Making Your Own Telescope - by Allyn J Thompson I discovered this book by talking with all the telescope makers and astronomy hobbyists that came here to buy plate glass The few who had a copy of this book told me what a prize it was The level of detail in this book is incredible You rarely see that today So I've got a digital copy for Get Price

Making Your Own Telescope

Jan 01 2003A 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 Get Price

Grinding Material

As I was grinding on the weekend I am on the last 2 abrasives aluminum oxide 9 and 5 micron It is said that when grinding has been successfully completed the mirror will feel like the finest satin to the touch and newsprint can be read through it It's already unbelievably smooth and not quite able to read through but nevermind Get Price

What is the difference between spherical and parabolic

Jul 05 2016A2A Practically if the f-ratio is high enough there is very little difference between a mirror that has a parabolic shape versus one that is spherical A parabolic mirror will focus parallel rays into a point but a spherical mirror (with circul Get Price