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To Grind A Telpe Mirror The Principle . to grind a telpe mirror. (three evenings). this exercise is not intended to make a perfect piece of optics, but just to show the principle of the Joy Of Mirror Making Fine Grinding. fine grinding a telpe mirror. 220 silicon carbide grit for initial fine grinding: 60 microns (varies from 100 ...
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Well, that depends. Mostly on the mirror size you wish to grind, and the prices of the local market. In the US, telpe mirrors are the cheapest. A decent 6" (150 mm) mirror can be bought for under 100$. In Europe, prices are usually twice, if not …
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How to grind a mirror for a telpe 39:44. How to grind a mirror blank into the well-figured basis for a Dobsonian telpe. 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 point. x. Grinding a 25-Inch F3 …
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The telpe mirror is round in shape, and you will need to cut off the four square corners into a perfectly circular piece of glass. That should get you a glass blank with a ratio of 16:60 slides and a flat surface of at most 1:8.
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Share. Posted August 24, 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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Grinding an 8″ F/10 Telpe Mirror. For this project (my first time ever grinding a mirror) I ordered an 8″ Black Vitrified Ceramic (BVC) blank without a pregenerated curve from ASM Products in Ste-Basile PQ. Ordering from Canada is always cheaper once you factor in all the taxes – all told the kit cost about $185.
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The first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the …
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Why would grind a mirror when you can buy one just as cheaply? When the North American amateur telpe making movement began in the 1920's, there were few alternatives - the only commercial telpes where extremely expensive and often where individually commissioned. Making your own was the only way for most people.
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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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The mirror also has to be stable over time and be self supporting to some extent. Semi equipment starts with a flat wafer and makes >20nm features (transistors) and doesn't create a surface. While the wafer is large, the die (chips on the wafer are small). Not a match for making a telpe mirrors. So-1) can you 3D print a sphere or parabola ...
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I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters …
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It will take much less time than trying to get a "perfect" mirror on your first try. And don't start out with anything larger than an 8 inch - it is generally accepted that the difficulty grows roughly with the cube of the aperture. Stick to moderate focal ratios - say between f/6 …
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Use this formula to calculate your target sagitta: Sagitta (s) = Mirror_Radius2 / ( 4 × Focal_Length ) = r2 / 4F. or use our Telpe Formula and Design Comparator to do the math for you. If you have measured a Sagitta and want to know the resulting focal …
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Newtonian telpe is its primary mirror. Most Newtonian primary mirrors have either a spherical or a parabolic shaped concave face. Unlike most other mirrors in your home, the mirror coating of a Newtonian mirror is actually applied to the front face of the glass, not the back. The light collected by the Newtonian primary mirror does
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Then you grind or polish the raised edge off, resulting in a turned edge when the mirror cools down. Turned edge problems: These can be a problem with any type or thickness of glass. It's by no means restricted to thin mirrors - and it's just as often a problem with full-thickness pyrex mirrors.
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Share. Posted August 24, 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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Wanting To Grind A 20" Mirror. Where Do I Start? - posted in ATM, Optics and DIY Forum: Im a complete newbie on this, other than my huge enthusiasm for wanting to look up at the night sky through a telpe. I want to build a Dobsonian using a 18 mirror. Is this a tough undertaking and dangerous for a new person? Should I be really experienced before trying this?
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Steps for Telpe Mirror Coating. Step 1: Strip the old coating. Step 2: Prepare the praying chemical mixture. Step 3: Clean the mirror. Step 4: Sensitize the mirror surface. Step 5: Spray the mirror surface with the silvering mixture. Step 6: Apply anti-tarnish coating and let dry.
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Save money and time by purchasing a telpe mirror kit. This kit includes an 8 inch telpe mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish an 8 inch telpe …
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To Grind a Telpe Mirror (Three evenings) Authors; Authors and affiliations; M. G. J. Minnaert; Chapter. 132 Downloads; Abstract. This exercise is not intended to make a perfect piece of optics, but just to show the principle of the methods used in practice and to convince our students that amateur telpe making is surprisingly simple and ...
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· Because the mirror's focal length is large in relation to the mirror's …
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One way: do about 8 circular strokes. Then center the mirror on the tool. Turn the lower piece of glass to the left by about 15 degrees (1 hour on a normal clock face); then turn the upper piece of glass about 10 more degrees. Then grind away for 8 more circular strokes.
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Telpe Formulas and Design Comparator. This page has formulas for many telpe and mirror parameters. It will calculate parameters for two different telpe designs and compare the results for you. It provides data to help in selecting a telpe, and also …
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(Part two of my description of the essential steps in making a telpe) 2. Hogging Out means making your mirror blank have roughly the proper concave shape for the focal length or f-ratio that you want. There are many articles and web pages on this, …
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This page describes the rough grinding process. Before You Start. Use this checklist to make sure you are ready to start rough grinding: You have selected a mirror diameter and focal ratio, and have use these to calculate a target sagitta.; You have a way to …
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Telpe mirrors have the smoothest surfaces ever made. The highest "peaks" and lowest "valleys" on the mirror surface must be much smaller than the wavelength of light which we will be observing. Visible light has a wavelength around 550 nm (21.6 micro-inches, or 0.022 mils).
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Grind and Polish a Dobsonian/Newtonian Telpe Mirror With Hand Tools: Author's note: This Instructable was written and published by our Making and Tinkering …
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To Grind a Telpe Mirror Three evenings Authors Authors and affiliations M. G. J. Minnaert Chapter. 121 Downloads Abstract. This exercise is not intended to make a perfect piece of optics but just to show the principle of the methods used in practice and to convince our students that amateur telpe making is surprisingly simple and .
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Here is the result of firing the above stack of glass. Once out of the kiln, I removed it from the mold, and trued up the edge on my grinder. It is a fine-looking, near full-thickness, 10 inch diameter blank that I intend to grind and polish into a 1st class …
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Thin Telpe Mirrors . Abridged from an article appearing in Telpe Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Part I - Grinding . For many years, amateur astronomers and telpe makers thought it essential that glass for telpe primary mirrors be at least one-sixth as thick as its diameter.
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