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The 1.3m telescope mirror blank has been completed by Peter Wangsness and is now … 1.3m mirror blank – yard stick comparison . 1.3-m Mirror Grinding Machine – Photo: Mike … Mirror-o-Matic mirror making machine – ATM pages of Berthold …
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Grinding and Polishing a Meniscus Mirror ATM In many respects, the grinding and polishing stages of fabricating a thin meniscus telescope mirror are not different from any telescope mirror. There are lots of resources, online and in print, describing that. This article will focus on the specific issues introduced by working on such a mirror.
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I developed my process while working on large thin mirrors in the 1980's and on my recent 13 inch [34cm] f3.0, 6 inch [15cm] F2.8, 10.5 inch [27cm] F2.7 and 25.1 inch [637cm] F2.6 mirrors. I read comments like, "thin mirrors cause astigmatism", "the thermal effects of plate glass make figuring difficult". Neither is true because process matters.
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The center will deepen during the first stage of fine grinding as contact is achieved across the mirror face and fine grinding tool. On larger mirrors, the ring tool may leave the zones part way to the edge a little underground. For these mirrors, as you near the depth, you can alter the strokes to be off-center.
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Welcome to my channel - in this video, we will begin to make a telescope mirror from scratch! I'll be showing you the basics of telescope mirror grinding!Her...
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To contact TelescopeMirrorBlanks with questions or comments about our glass mirror blanks, please email David here: mirrorblanks (at) gmail (dott) com. You must place the "@" sign and "." in the usual places when writing - we spelled them out here to defeat those nasty spam bots. For regular mail inquiries or purchases, please write to our ...
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The problem with thin mirrors is that they flex more easily during grinding and polishing, making it hard to achieve the required surface precision. They also need a more complex mirror cell (additional support points). Plop is a useful software to let you calculate the number of points needed based on the diameter and thickness of the glass:
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FORCE When grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape. While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirror.
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Note the thin veneer layer on top because these two mirrors happen to be very fast and deep, F/2.7-2.8. It's important to keep the pitch approximately the same thickness from center to edge because thinner pitch acts harder and thicker pitch acts softer.
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Grinding Your Telescope Mirror Polishing Your Telescope Mirror Glass Notes Grit and Microgrit Grading Conversion Chart at READE Making a tile on plaster tool Berthold Hamburger's Tile Tool Page (mirror) Grinding with Washers Grinding Large Thin Mirrors Part I Grinding,Polishing and Figuring Large Thin Mirrors - Part 2 - Polishing Astronomy ...
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Page 1 of 4 - Grinding a 6 inch Mirror - posted in ATM, Optics and DIY Forum: Hey Everyone, I first made a 6 f/10 telescope back in 2002. It was, as everyone called it here the minimum size you should make. So I went ahead with it. The f/10 was because some gentleman had ground the glass to f/10 and abandoned it in the local astronomy club and the president of …
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Thin Telescope Mirrors . … I can buy it easily and get all the starting work done on diamond-grinding machines – something most of you don't have access to. Mirror grinding machine – Hack a Day. ... Telescope mirror grinding machine Mirror making and optical testing … The images below show the completed grinding machine in it's new ...
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Grinding a Mirror "For it is true that astronomy, from a popular standpoint, is handicapped by the inability of the average workman to own an expensive astronomical telescope. It is also true that if an amateur starts out to build a telescope just for fun he will find, before his labors are over, that he has become seriously interested in the ...
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Grinding a Large Thin Mirror # Introduction # Years ago amateur telescopes were made with mirrors of a relatively modest size. 6 and 8 inch telescopes were considered large. A 10 inch telescope might be the envy of a club or observing group. In the recent past people have learned how to make large mirrors.
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using a mirror that you have ground yourself is immensely satisfying and joyful. In addition, a great deal of money will be saved: a finished 24" scope will set you back $7,000; grinding your own mirror and building the mount yourself will cost you $2,000. Amateurs have made mirrors up to 41" by hand. A
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For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots. Grind until they disappear.
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is my father's garage where he is currently working on his telescope hobby. The Diamond curve generating machine in this vi...
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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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I know it is bordering on the edge of extremely thin with a 32:1 thickness ratio but it is possible as John Dobson has been known to successfully grind a 24" mirror 3/4" thickness. We have decided on an F/6 with a .25" sagitta it allows .5" center thickness.
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A pitch lap is used to polish and figure your mirror. It is used with a polishing abrasive such as Cerium Oxide. Traditionally, the lap is poured on the tool used to grind the mirror. But this means the that tool is no longer available should you need to return to fine grinding due to a …
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Thin Telescope Mirrors . Part 2 - Polishing . Abridged from an article appearing in Telescope Making #13 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . I am going to start with some additions to topics covered in part 1, on grinding mirrors.
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(3) A homemade telescope mirror can be made with more accuracy and smoothness than the mass-produced, commercial mirrors available today. Unfortunately, the cost of mirror grinding kits and pyrex blanks has increased significantly in recent years to the point where any savings from making a mirror versus buying one are minimal at best.
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small mirrors, plate glass will work fine too. Telescope mirrors are relatively thick. The concave shaped face is made by repeatedly ... There may be a very thin film of plaster over some the tile faces, this will grind off in the first few grinding sessions. ...
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The first phase of rough grinding my 8.5 inch Pyrex disc into a telescope mirror. Including beveling the edges, measuring sagita (central depth), and grindin...
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The photo at right show an aluminized 4" mirror. The black ring is used for telescope alignment, the apparently mottled surface is the reflection of textured white ceiling in the room the photo was taken. Summary. Mirror grinding and figuring consists of four major steps (plus aluminizing).
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Each kit comes with a telescope mirror blank and all the abrasives (silicon carbide grits and white aluminum oxide powders), cerium oxide polish and pitch to grind and polish it to your specifications. Please note that our kits do not include a grinding tool or pitch lap. If you need materials for making a grinding tool or pitch lap, we have ...
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For a discussion on the fabrication of thin mirror blanks please refer to the following article in: Kestner, Bob, "Grinding, Polishing and Figuring Thin Telescope Mirrors, Part 1 - Grinding", Telescope Making 12, Summer 1981, pp.30 -35.
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Metal & Mirror Optical Thin Film Coatings. JNS precisely deposits enhanced aluminum and protected silver and additional reflective metals for numerous optical applications. Precision reflective coatings from JNS offer stability of reflectance and …
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Read Jean Texereau, How to Make a Telescope, even if you do find a good mentor to work with. It's a classic, very well written and the methods he describes are still spot on, in year 2020. I would recommend NOT starting with a thin mirror, a really big mirror, or a really fast mirror. An 8 inch f/6 or even 6 inch f/8 is a great starting point.
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Thin Telescope Mirrors . Abridged from an article appearing in Telescope Making #12 Provided: Courtesy of Astronomy Magazine Article's Author: Bob Kestner . Part I - Grinding . For many years, amateur astronomers and telescope makers thought it essential that glass for telescope primary mirrors be at least one-sixth as thick as its diameter.
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