how to reduce sagitta? - ATM, Optics and DIY Forum ...
how to reduce sagitta? - posted in ATM, Optics and DIY Forum: Im currently rough grinding my first mirror. Its roughly 8.25 diameter, and Im shooting for f/6. I overshot my sagitta by a bit. Im currently at about 0.110 sagitta, which puts me a little under f/5. I dont want to make my figuring work more difficult than necessary, so Im trying to get back to around f/6.
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Parabolizing 2 | Telpe Building
Parabolizing 2. 2014 October 01. The question is whether to continue figuring the mirror or to be happy with what I have. A strategy: to do a star test. In September we attempted to get a tumble-down jig up to speed. Even though we got the pieces of the jig together, the streetlights around the community center reflect too brightly off the ...
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[email protected] | Newbie question: polsim and ...
Getting good contact in the last stages of fine grinding is paramount. Assuming the Sharpie test passed, the turned edge likely came from initial polish. The temptation during initial polish is to let the machine run for a long time at one setting. ... Telpe Makers at Stellafane. The ATM.s have just acquired ...
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Stellafane Links Page
The Baker Road Inn telephone: (802)886-2304, Springfield, VT*. Chester House Inn. Springfield Chamber of Commerce. Jay Drew*. For the convenience of our readers, we provide links to other web sites that offer additional or supplementary information to that provided on …
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Dobsonian Mount | Telpe Building
Dobsonian Mount. In making the mount, I by and large followed the instructions on the Stellafane site. Where I diverged most was in the so-called tube cradle, which I replaced with my adjustable curtain-track trunnion system. To build the mount I purchased (my major wood outlay) a piece of ¾" red oak plywood, which because of a ...
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53 Telpe Mirror Making ideas | telpe, telpes ...
Jun 8, 2017 - Explore Neil Aubrey's board "Telpe Mirror Making" on Pinterest. See more ideas about telpe, telpes, diy telpe.
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aluminum oxide for grainding disc
HWALU Metal is a leading manufacturer and supplier of Aluminum 5005 Coil.We have been a part of this industry for years. We are providing a wide variety of …
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Question about operating a Stellafane Foucault tester ...
Question about operating a Stellafane Foucault tester - posted in ATM, Optics and DIY Forum: Hello, Id like to make a Foucault tester. I read Stellafane instruction and Im still not sure how to operate the tester, and have some questions about the parts: Where do I put my eyes? Is it the same as hole (A) where the knife edge is? The tutorial says turn the knob so the …
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Looking for advice for building Foucault tester - ATM ...
Looking for advice for building Foucault tester - posted in ATM, Optics and DIY Forum: Hello all, First time poster here. Im very excited to be working on my first telpe mirror, a 6 f/8. Really enjoying the process. I am currently progressing through fine grinding and as I get close to the polishing stage Im looking to build a Foucault tester.
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Where to buy mirror blanks? Stellafane links are half dead ...
Stellafane links are half dead. - posted in ATM, Optics and DIY Forum: Half the links on stellafane are dead. ... Or do you want to avoid the grunt work and skip to fine grinding the curve to a good sphere? Edited by stargazer193857, 13 September 2020 - 02:47 PM. Back to top #11 ppg677 ppg677. Ranger 4 ...
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Telpe Mirror Grinding Machines | Crusher Mills, Cone ...
Having been on the ATM list now since … Mirror Grinding Machine, G. W. Ritchey | Flickr – Photo Sharing! … grind a series of telpe mirrors starting with a 24-inch and then a 60-inch mirror for a telpe initially intended for the Yerkes Observatory.
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Grinding Salt Powder Until 5 Micron - skpkarasiewicz.pl
Stellafane ATM: Fine Grinding. A typical grit sequence for an 8" mirror that did rough grinding with #60 grit would be: Silicone Carbide: #80, #120, #220 Aluminum Oxide: 32, 20, 12, 5 micron Often, #320 Silicon Carbide is used instead of 32 micron Aluminum Oxide, and #500 is used instead of. Get Price
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Stellafane 2008. - umich.edu
Stellafane 2008. Printed in Reflections: September, 2008. Stellafane sits on roughly 90 acres of land that is known as the mecca for Amateur Telpe Makers. Legions of amateur telpe makers travel to Breezy Hill in Springfield Vermont. They come there to discuss the design, manufacture and the ins-and-outs of telpe making.
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Optics: Spider and Secondary Mount | Telpe Building
Optics: Spider and Secondary Mount. The spider and secondary mount began straight from the stellafane site but evolved as I chatted with my expert advisors. The mirror is mounted to a length of dowel. A bolt runs up the dowel and out and through a hub that is a milled cube of aluminum. The corners were milled out of the cube; so that from above ...
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Stone crushing plant for concrete mixing 1
stellafane atm fine grinding jaw stone crusher with iso90012008 reliable company ball grinding 03 rock phosphate grinding modern techniques list of heavy industries in kanpur worldcrushers stone crusher plant in sangli maharahtra pabrik suku cadang pasokan dan permintaan ...
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procedure grind a pencil
Stellafane ATM: Fine Grinding Fine grinding, and later polishing, Procedure: The procedure is simple Use a #2 pencil or permanent marker to to freehand draw an approximately 1 inch grid on .... How to Use a Pencil Grinder for Grinding Metal - Kevin Caron
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POLISHING – Astro Khan Telpe Making
Once the fine grinding with the finest abrasive is done, next step is polishing. Many people won't believe if you show them the ground mirror and tell them that it will be polished to a mirror finish. OK, you need following to start the polishing… Pitch Lap (follow the link to see how the pitch lap was made) Polishing Mix (cerium oxide)
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fine grinding center
Stellafane ATM: Fine Grinding. STROKES: Use the Normal Stroke (1/3 Center-over-Center) for all of fine grinding. PRESSURE: You can press hard while using the coarser grits, and more pressure should make grinding go faster. You should reduce pressure as the grits get finer. When you get to 12 micron or below, the weight of the tool or mirror ...
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Parabolizing 1 | Telpe Building
Parabolizing 1. 03.06.2014. I used the parabolization stroke for thirty-five minutes and moved from strong spheroidicity to 2/5 wave. 06.06.2014. I continued with parabolizing strokes. Some turned down edge led to some tightening of the amplitude of the strokes. Then a hole in the center led to even more of a tightened amplitude, but with full ...
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"Pregenerated" and Secondary Mirror Questions - ATM ...
"Pregenerated" and Secondary Mirror Questions - posted in ATM, Optics and DIY Forum: Hello all! I have just recieved a mirror blank and a focuser (thanks Augustus!), however I have a couple of questions. First, the mirror is a 6 and it is pregenerated to F/8 My question is does this change anything about the mirror in the first place? Im aware that I have to grind and …
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Telpe Mirror Grinding Machine | Crusher Mills, Cone ...
Fine Grinding a 20" Quartz Telpe Mirror. Rough Grinding on the Fixed-Post Mirror Grinding Machine. Hogging the Curve on a 20" f/4.5 Quartz Telpe Mirror. SkyBadger – Mirror Grinding Machine. ... Stellafane ATM: Materials & Tools.
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The Mirror: Grinding, Polishing, Figuring | Telpe Building
In regular visits through the winter I began the grinding, polishing, and figuring the mirror blank to astronomical standards. After forty-five hours of my "pushing glass," the experts declared the mirror finished once it reached 1/6 wavelength through Foucault testing. I sent the mirror to Majestic Optical for coating (Al/SiO). It was back within a…
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Stellafane ATM Main Page
For rough grinding a 6" mirror, about 1/2 teaspoon of grit is used per wet. With finer grits, proportionately less grit is used per wet. Grits in the25 micron range are often premixed with water to form a slurry, and water and grit are squirted onto the work together from a plastic squeeze bottle (not a spray bottle). Sprinkle on Grit
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Stellafane ATM: Polishing
Fine Grinding. The purpose of fine grinding is to smooth the surface generated by rough grinding and to get "good contact": ... Details of each step are provided in subsequent pages, along with plans to build your own tester - go back to the Stellafane ATM Index Page to …
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Stellafane ATM: Fine Grinding
in the 2001-02 Stellafane Mirror Class. Fine grinding refines the basic shape you have ground into the surface of the glass with rough grinding. The sequence of ever finer grits that you use smoothes the rough surface that was made in rough grinding, and prepares you for polishing.
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Getting started on my 6" mirror blank - ATM, Optics and ...
Page 1 of 9 - Getting started on my 6" mirror blank - posted in ATM, Optics and DIY Forum: Years ago I began grinding a 6 mirror blank with the Stellafane Telpe Makers in Springfield VT. I lived in Southern CT and worked as a planetarium supervisor so my attention got stretched thin and the mirror was one of the first things to drop. My wife and I moved to Seattle …
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tut44 Making A Mirror Grinding Tool - Asterism
During the grinding process, only the depth of the concave surface is measured. Good grinding technique will produce a spherical shape, therefore the only important property needing measurement is the depth of the concave surface at the center of the mirror. The easiest way to do this is by placing a stiff
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Mirror-Making Workshop - Texas Star Party
Fine grinding: includes Fine grinding, Measuring Sagitta; Polishing: Foucault Testing; Ronchi testing; Spectators are welcome to look and listen, but please don't touch anything unless invited by one of our instructors. Let's Get Started! The Stellafane Telpe Makers have a great website that will help you get started! Overview of Mirror ...
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Joy of Mirror Making: Introduction - BBAstroDesigns
Fine grinding. A series of ever smaller grits are employed in order to repair the damage caused by rough grinding, concluding with aluminum oxide which leaves much smaller pits and fewer fractures compared to the silicon carbide. This stage is called fine grinding.
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Telpe Building | Pushing Glass and Sawing Wood
From mid-November 2012 to mid-April 2013 I constructed a telpe from scratch … from grinding the mirror to building the tube. This site was initially conceived for family and friends to keep track of my progress. Early on I began to think the site could be helpful (and encouraging) for aspiring hobbyists. The telpe was a six-inch f/7.73…
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