WEB1. Clean: Make sure your plaster disk is clean and you are using a glass substrate or tile tool, clean the surface with turpentine. 2. Build a Dam: Using 2" wide masking tape, build a dam at least 3/4" high around the edge of the disk to hold the pitch in when you pour it. Leave a tab at the end by to facilitate later removal.
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WEBFeb 19, 2013 · For a 12 inch working by hand I can do the grinding in one afternoon if it is generated . Polishing should not take more than 10 hrs . Get it all polished out your work is half done. Testing and knowing what to do takes skill and should not be understated . No harm in having a pro test it .
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WEBAug 15, 2019 · I made the overarm from " steel tube, cut and fitted to size. Buttwelded, cleaned up with a grinder, painted and trial fit. It seems too low, but I will build sandwiched plywood layers, glued together and put everything up on that. You do not have the required permissions to view the files attached to this post.
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WEBNov 4, 2022 · "Amateur Telpe Making, Book 1″ by Albert Ingalls has a complete description of how to make such a telpe, including grinding and polishing the mirror.
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WEBJan 26, 2012 · Astronomers want increasingly large telpes to peer into the depths of space. To build a solid telpe mirror nearly 30 feet across, you need an oven that heats to 2,100 degrees Fahrenheit ...
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WEBMaking a Refractor Telpe: How to Design, Grind, Polish, Test, Correct and Mount a Doublet Lens. Be the first to review this product. Out of stock. SKU. . Add to Wish List. Email. Making a Refractor Telpe is a handson book for the amateur who has always thought making a refractor was too difficult to even .
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WEBFeb 16, 2021 · Grinding a Large Thin Mirror # Introduction # Years ago amateur telpes were made with mirrors of a relatively modest size. 6 and 8 inch telpes were considered large. A 10 inch telpe might be the envy of a club or observing group. In the recent past people have learned how to make large mirrors. This started with the .
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WEBFeb 14, 2015 · It's easy to tell with a mark on the edge of the mirror, and often even from the "flower" pattern in the cerium oxide. I rotate the mirror on the table often. During figuring I make sure to put the mirror back on the table in a different orientation after testing. Just finished a " f/3 that was pretty thin (" edge) and it turned out fine.
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WEBJan 26, 2024 · Each component serves a distinct purpose. The main telpe tube houses the telpe's optics. The focuser connects the eyepiece to the telpe and allows for fine adjustments. The mirror or lens cell holds the telpe's primary mirror or lens. The eyepiece holder secures the eyepiece, and the finder scope helps you aim the .
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WEBAug 29, 2007 · aluminium telpe mirror posted in Beginners Forum (No Astrophotography): In amateur telpe making, telpe mirrors, as I understand the process, are made by rubbing two vertically stacked disks of glass against one another until the lower disk has the desired concave shape. The mirror is then polished smooth and .
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WEBStep 3: Building the Mirror Mount. A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror ( 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.
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WEBRichard F. Caris Mirror Lab tour tickets are available for the summer. Please read below as our tour has changed. For inquiries, the best method to reach us is by sending an email message to Our phone number has changed to . We will meet at the lobby of Steward Observatory and begin our tour at the Steward ...
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WEBA telpe mirror can be made from glass that is somewhat less pure than that used to make a lens, since light does not pass through it. Often a strong, temperatureresistant glass such as Pyrex is used. ... grinding, and polishing. A mirror is formed in exactly the same way as a lens until the reflective coating is applied.
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WEBSharing how I made a simple turntable to grind a telpe, I share the mirror kit I bought 6in plate glass with various carborundum grits. Ne...
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WEBSet at the right angle it will start to make a concave curve in the angle determines how deep you want the center of the mirror to be. This is called the "sagitta". [Fig 5]After you've ground the glass to the desired depth the mirrors surface will be opaque like this.
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WEBIntroduction. Grit is a generic name for the abrasive particles used with a hard tool in rough and fine grinding. Polish (or Polishing Compound) is a generic name for the abrasive used with a soft Pitch tool in polishing and figuring. Grit and Polish differ mainly in particle size and the type of tool they are used with.
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WEBCreating a telpe mirror is more than just grinding the appropriate shape into the mirror. The most important part is figuring the mirror to the appropriate prescription, which requires having an appropriate test mechanism (to verify the prescription) as well as a diagnostic mechanism (to identify which parts of the mirror need correction). ...
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WEBMay 7, 2011 · It gives detailed information on mirror grinding and on building three different telpes, including a 10inch Newtonian and a 12inch Cassegrain. The prose is a bit formal, perhaps due to its translated (from French) origin. The Dobsonian telpe is given only a cursory treatment, but over all, this is still a pretty good book.
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WEBNov 17, 2023 · Dielectric Coatings. Silver Coatings. Standard aluminum coatings are by far the most common coatings for mirrors today, and most mirrors have either standard aluminum or aluminum that has been slightly enhanced chemically. They're deposited on the mirror in a vacuum chamber in one go, and the typical reflectivity is around 8993%.
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WEBA tile tool may completely grind an 8inch f/8 mirror without reapplying tiles. Bigger mirrors will probably need a second and third layer of tiles. It is possible to stand the tiles on edge within a form set on a Saran Wrap covered mirror and encase them in Pourstone Plaster. This will give you a full inch of tool thickness which will ...
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WEBJul 1, 2020 · Large telpe mirrors are made by spinning a disc of molten glass so its surface assumes a parabolic shape, and then slowly cooling it while spinning so it retains that shape after it solidifies. Mirror blanks up to ten meters in diameter are routinely cast this way. After the mirror blank is finished, it is placed under a fouraxis polishing ...
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WEBMay 9, 2010 · The 20" quartz telpe mirror is polished out, and Gordon is ready to begin deepening the curve toward a paraboloid. In this video, he shows how to press ...
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WEBMar 4, 2011 · An alternative, which seems very popular with home machine builders, involves rotating the mirror at a relatively high speed whilst the tool has minimal movement or is fixed (as in the case of Gordon W's machine). The trick is to place a correctly sized tool in the appropriate position to ensure an even grind/polish.
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WEBMay 19, 2021 · The mirror couldn't be spherical. Correct me if I'm wrong, but manipulating a sphirical mirror in this way, and have it still produce an image, could only result in a parabolic shape. The only test in the above document was to test separate parts of the mirror to determine image quality. He would set up the mirror into a telpe.
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A material supplier from Belgium would like to produce limestone powder for his custome...
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