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Grinding the primary mirror of the Hubble Space Telescope ...

Grinding it down.. to the wrong specifications. Grinding it down very accurately to the wrong specifications. Black paint had chipped off a screw in the focal testing device, exposing the shiny metal, and they were focusing on that instead of the intended point light source. It was still focusing very accurately, just slightly off axis.

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tut44 Making A Mirror Grinding Tool - Asterism

Typically, the primary mirror is made of glass. Pyrex is commonly used for the primary mirror because of its thermal stability, but for small mirrors, plate glass will work fine too. Telescope mirrors are relatively thick. The concave shaped face is made by repeatedly rubbing the primary glass blank over another blank called the "tool".

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mirror grinding machine | worldcrushers

May 15, 2013· New grinding machine The new grinding machine is being used to re-make the old TRO 30 inch mirror and the three 20 inch mirrors. It will be capable of making a . Mirror grinding machine construction log – JamesCrombie page1

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Rough grinding a mirror blank - YouTube

Apr 27, 2011· Pushing glass. The initial rough grinding of a 10 inch diameter, f/5 telescope mirror blank. See updates on this project at mdpub.

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Newport Glass Works, LTD. Grinding, Polishing and Figuring ...

Placing the mirror face up and grinding with a moderate "W" stroke will also move the curve toward the edge, and tends to produce a more spherical surface. Leaving the mirror grossly hyperbolic will make fine grinding difficult. Fine Grinding . We've all heard stories about fine grinding taking hundreds of .

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SkyBadger - Mirror Grinding Machine

While grinding the first mirror I discovered that there is a range of test equipment that I needed to aquire or build to analyse the steps along the way. The spherometer is used to measure the mirror curvature as it roughed out, the mirror stand to hold it for testing, the foucault tester to do the focal plane testing, a light source for the ...

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Surface finishing - Wikipedia

Surface finishing is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property. Finishing processes may be employed to: improve appearance, adhesion or wettability, solderability, corrosion resistance, tarnish resistance, chemical resistance, wear resistance, hardness, modify electrical conductivity, remove burrs and other surface flaws ...

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draper mirror grinding machine 」

Find Telescope Mirror Grinding Machine related suppliers, manufacturers, products and specifications on GlobalSpec a trusted source of Telescope Mirror Grinding . Inquire Now; Fixedpost 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 curvegenerated.

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draper mirror grinding machine 」

Find Telescope Mirror Grinding Machine related suppliers, manufacturers, products and specifications on GlobalSpec a trusted source of Telescope Mirror Grinding . Inquire Now; Fixedpost 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 curvegenerated.

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Mirror Industries

Office: 800-316-9033 | Fax: 713-686-9831 (Toll Free) or 713-686-4435 11510 Kilburn Houston, TX 77055

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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...

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Making a Mirror. - Astronomy

Dec 16, 2002· 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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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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Mumbai Rains: Trackman dies of electric shock near Masjid ...

In a heartbreaking incident, a 27-year-old trackman died of electric shock in the wee hours of Thursday. According to the initial information, the victim has been identified as Sanjeet Kumar.

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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

31 rows· Here is a 25 inch [635cm] mirror being rough ground followed by a beautiful grinding stand .

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Mirror grinding | Hacker News

Mar 10, 2017· 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. Here are a couple examples:

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Primary Mirror Grinding Kit - Easy Sourcing on Made-in ...

Dear sir, My name is ankit chouhan I want to purchase the primary mirror grinding kit, that would include 1. Two glass blanks of 8 Inch diameter 2. Various grinding grit size required for grinding. I have attached the grit sizes that I found on the internet. But I would also like if .

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Internal mirror grinding with a metal/metal–resin bonded ...

Jan 01, 2001· In contrast, mirror grinding with fine abrasive wheels was achievable when appropriate parameters were chosen. In this investigation, ELID II grinding with a #325 CIB–CBN wheel was used for rough grinding and the MRB–CBN wheels were utilized for finish grinding only. 4.3.2. Mirror surface grinding with ELID III

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How to grind a mirror for a telescope - YouTube

Aug 09, 2011· How to grind a mirror blank into the well-figured basis for a Dobsonian telescope. How to grind the glass, how to carry out a focus test, how to polish with a pitch lap and how to find the focal ...

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Mirror grinding machine construction log - James Crombie

Mirror grinding machine construction log ... The blue LED is quite bright, plus I ground and polished the end of the LED to reduce the spread of the light source. I now have to finish cleaning the basement of all the wood dust from the project. Sept 30, 2003 Finished up an adapter to use my buddies mirror holder for the Foucault tester. ...

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Dick Parker's Telescope Mirror Workshop: Cassegrain ...

Grinding the secondary is just like grinding any other optic except in minature. I ground the secondary with the workstand and worked the tool on top just like I would grind a larger mirror. This optic is small enough that a lens grinding machine could work well.

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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...

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Mirror Surface Grinding of Silicon Wafers with ...

Jan 01, 1990· Mirror Surface Grinding of Silicon Wafers with Electrolytic In-Process Dressing H. Ohmori, T. Nakagawa (1); Institute of Industrial Science, University of Tokyo Received on January 24,1990 SUMllARY:The authors have studied finish grinding techniques.and succeeded in developing a new grinding technique that realises mirror quality surfaces.

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A high quality surface finish grinding process to produce ...

x-ray source, and quartz glass was used for the mirror. 3. Grinding characteristics of quartz mirror 3.1. Grinding method, experimental set-up and conditions A precision grinding with electrolytic dressing process [8] was applied to finish mirrors; figure 2 illustrates the experimental grinding set-up, which was developed in our previous ...

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Rough grinding a mirror blank - YouTube

Apr 27, 2011· Pushing glass. The initial rough grinding of a 10 inch diameter, f/5 telescope mirror blank. See updates on this project at mdpub.

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US7344573B2 - Impregnation of grinding wheels using ...

US7344573B2 US10/702,917 US70291703A US7344573B2 US 7344573 B2 US7344573 B2 US 7344573B2 US 70291703 A US70291703 A US 70291703A US 7344573 B2 US7344573 B2 US 7344573B2 Authority US United States Prior art keywords method additive non polar abrasive article Prior art date 2003-11-06 Legal status (The legal status is an assumption and is not a legal conclusion.

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Telescope Mirror Grinding Machine For Sale - Powder ...

Mirrors Telescopes, We are your source for astronomy telescopes eyepieces astroimaging cameras and more browse an extensive selection of astronomy equipment at Telescope Mirror Grinding Machine For Sale ... Clay crusher cheap stone crushing machine for sale telescope mirror grinding machines mirror grinding machine construction log more ...

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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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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror deformation ...

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Mirror Grinding Machine

My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telescope mirrors. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Over the years, I'd been collecting motors, gear boxes, pulleys, etc.

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