mirror grinding paraboloid

Hyperbolic / Parabolic mirror question - ATM, Optics and ...

Oct 15, 2004· Page 1 of 3 - Hyperbolic / Parabolic mirror question - posted 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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Obsession Telescopes / Optics

During the figuring process, 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. These tests are qualitative and serve only to guide the figuring process.

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draper grinding machine - YouTube

Dec 12, 2006· This is a grinding machine for astronomical parabolic telescope mirrors. The machine can handle primary mirrors up to 80 cm/31.5" We are currently test driving our machine.

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Large Homemade Telescope Making Project - Google Sites

The mirror (or tool) was then carefully placed on top of the tool (or mirror) and grinding started (i.e., pushing the glass disk on top back and forth). The procedure was quite similar to grinding a smaller mirror, except that the disks are heavier.

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Telescope Mirror Grinding Machines | Crusher Mills, Cone ...

Telescope Mirror Grinding Machines ... Mirror grinding machine construction log – JamesCrombie.com page1. ... spin-cast paraboloid is not sufficiently accurate to permit its immediate use as a telescope mirror or lens, so it is corrected by computer-controlled grinding machines.

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Surface Lapping & Polishing | Swift Glass

Surface Lapping & Polishing Swift Glass specializes Surface Lapping and Polishing services that deliver results for any job requirement. Our facilities utilize both computer-controlled and manual based machinery, which gives us the ability to complete both high and low volume projects.

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Parabolic Mirrors - ThomasNet

Manufacturer of parabolic mirrors. Mirrors are shock resistant. Specifications include tempering range from 1/8 in. up to 2 in. & glass size range from 1 in. up to 36 in. x 72 in. Capabilities include cutting, edge grinding, convexing & bending, surface lapping & polishing, hole drilling & chemical strengthening.

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Wooden Telescope Part 1: the Mirror: 14 Steps (with Pictures)

The grinding of the mirror was done at home. It took more than a month to finish the mirror grinding and getting it silvered. The mount was also built and enjoyed viewing the craters of the moon and especially Saturn rings.

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Making Your Own Telescope - Google 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 …

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Amateur telescope making - Wikipedia

Amateur telescope making is the activity of building telescopes as a hobby, ... Grinding a mirror using an abrasive and a smaller tool over 300 mm mirror ("ATM Korenica 2006", ... The mirror has to be carefully ground, polished and figured to an extremely accurate shape, usually a paraboloid.

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tut44 Making A Mirror Grinding Tool

Making A Mirror Grinding Tool By Allen Malsburry The average person would never think, "I can make my own telescope." Most amateur astronomers believe, "I can buy a better

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Parabolic mirrors | Revolvy

Parabolic mirrors Circular paraboloid One of the world's largest solar parabolic dishes at the Ben-Gurion National Solar Energy Center in Israel A parabolic (or paraboloid or paraboloidal ) reflector (or dish or mirror ) is a reflective surface used to collect or project energy such as …

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Jeff Baldwin's machine

Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.

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Off-Axis Parabolic mirrors - Web Essentiel

Off-Axis Parabolas Off-Axis Parabolic (OAP) Mirrors are used throughout sophisticated reflective optical systems today. Our customers use OAP's in beam expanders, collimators, airborne

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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.

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Build your own telescope part 1: The mirror – Thomas ...

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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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

31 · The Joy of Mirror Making ... 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. ... But the shape that will focus light coming from distant astronomical objects to a single point is a paraboloid. Because the ...

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So you really want to build a Telescope Mirror. - Astronomy

With the rough grinding, feel free to apply a lot of pressure (watch out for putting excessive pressure on the edge of the mirror as you will quickly get a big chip off of the edge of the tool) to your mirror to get the grit to cut better.

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telescope mirror grinding - YouTube

Mar 25, 2009· telescope mirror grinding telescoop spiegel slijpen carborundum #800.

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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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Mathematical Modelling the Process of Cup Wheel Precision ...

A novel principle of cup wheel grinding of rotating concave quadric surface was proposed. The mathematical model of machining process was established to prove the feasibility of precision grinding of rotating concave paraboloid based on the introduced principle. The conditions of non-interference grinding of concave paraboloid were mathematically derived.

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Optics - Norway's largest optical telescope

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 …

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Off-Axis Paraboloid and Ellipsoid Mirrors | Photonics ...

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.

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Grinding,Polishing and Figuring - Part 2 - Polishing

Fine grinding: I change from my rough grinding area to my fine grinding and polishing area after 220, not before. #220 is still gritty stuff. The "W" stroke: This is a casual way of describing any stroke that goes forward and backward while progressing left to right or right to left on the mirror.

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ParabolicMirror | asphericon

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 …

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Wooden Telescope Part 1: The Mirror - 11 - Instructables.com

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. Since we know what the reflection should look like, we will make special courses with ...

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The shaping and testing of two 20" optical telescope mirrors

About this talk •Basic mirror shaping processes •Grinding and polishing machine •Grinding and polishing tools •Mirror testing techniques •Digital data reduction

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OSA | Stressed mirror polishing. 2: Fabrication of an off ...

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.

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