200 inch telpe mirror on grinding machine at the Caltech optical shop, Pasadena, Calif.Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California. ... Source Photographs, Huntington Digital Library . About the collections in Calisphere. Learn more about the ...
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 …
Downloadable! Large-diameter aspheric mirrors made of hard and brittle materials suffer from low efficiency in the grinding stage, making them difficult to process. In this study, a nonuniform rational basis spline (NURBS) interpolation method is proposed and developed based on the grinding wheel path planning. The characteristic parameters of NURBS …
The master craftsman, Roger Angel, who has been making telpe mirrors for 30 years, or its the technicians arranging—arranging not simply throwing into the mold—chunks of glass (pictured above), or those grinding and polishing the mirror, success depends on just knowing when you've done it right. Or, as Angel says, "Not …
Hi all, every year or so I get thoughts of grinding my own mirror, however, this time round I've took things a tiny step further and made enquiries about plate glass blanks at my local glass merchants. The thickest glass they have on site is just 6mm, but they said they can order 19mm plate, so I...
But I'm not sure where to get the mirror blank. I want a full thickness 6:1 blank, just to keep the process as simple as possible. A bunch of sources recommend …
In this paper, a segmented mirror containing seven hexagonal SiC blocks is ground with a fewer-axis grinding machine with an arc-shaped grinding wheel in simulation.
Holding the mirror: Don't let your fingers touch the bevel of your glass while rotating the mirror during grinding and polishing. When you rotate the mirror during it closer to the center of the edge. Touching the bevel heats the glass, causing to expand. ... When you first look at your mirror with a light source at center of curvature, it may ...
ÝÝÝÝÝÝÝÝÝÝÝ In his Codice Atlantico, Leonardo offers two of sketches of mirror making machines.Ý One machine is designed for grinding concave mirrors of small focal length.Ý The other machine, a much larger piece to implement, grinds mirrors of large focal lengths.Ý Though Leonardo da Vinci creates sketches of mirror grinding, one ...
Mirror grinding and figuring consists of four major steps (plus aluminizing). Rough and Fine grinding use hard tools (glass, tile or metal) and harder then glass abrasive grit (Silicon Carbide or Aluminum Oxide).
Page 1 of 2 - 24 F/6 thin telpe mirror grinding 3/4 plate - posted in ATM, Optics and DIY Forum: A friend and I have decided to grind this as a fun yet challenging project. I have ground and polished several mirrors including a 6, 8.5, 9.2, and 14.7 quartz mirror. I have decided to take the next step with this ultra-thin setup. I know …
TO GRIND A TELPE MIRROR (Three evenings) This exercise is not intended to make a perfect piece of optics, but just to show the ... The source of light is a small incandescent lamp L, around which slides a well-fitting metal cylinder, provided with …
Basics of Mirror Grinding. Glass mirrors are typically ground from a blank, or cylindrical piece of glass, using the abrasion created by moving the mirror across a second glass …
Fig. 3 shows the envelope grinding along with tool posture angle θ and envelope trace height h e.On the parallel YZ-sections, the CL and the angle ϕ are driven by the linkage of Y-axis and Z-axis translations and A-axis rotation according to (1), (2), (4), (5).The tool path interval f x is driven by the differential translation of X-axis. The …
Page 1 of 2 - Making my own fixed post mirror grinding/polishing machine - posted in ATM, Optics and DIY Forum: Hey guys. Im thinking of making my own fixed post mirror grinding/polishing and curve generating machine. Ive got loads of questions regarding the design so Ill just start firing away Do I need an eccentric moving tool to be …
This video demonstrates using a POLY-PTX® 800 machine to create a mirror finish on stainless steel. The points emphasized in the video include: Pre-grinding using a Trizact Sleeve (A45 – A06) Grinding diagonally for perfect results; Using pre-polishing paste (white) with Super Polish sleeve ... "THE SOURCE" for a variety of textures ...
Steel is very fast for grinding, Using 80 grit I would have the required curve in 1 1/2 hours on an 8" and 2 1/2 hours on a 10". Many years ago a mirror maker made his tools by putting scrap nuts, bolts and any other steel bits onto the pre-curved mirror and poured concrete onto the lot. You can always use a glass tile tool.
The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the …
Motorized grinding wheel on the end of along boom that is anchored that is moved back and forth across the mirror face. Work it in gently making very shallow cuts. Diamond wheel grinder rubbed against the mirror face. …
The rrindinr wheel of 130000 (average rrain diameter Is shown in CIFB-D wheel 188 used. A newly deviced power source (ELID-PULSER EDD-04S;has been commercial ized by SINTOBRATOR Ltd.) as well as the one Inwwas used. 6.3 Exper lmentai results by nano-rrlndlna (a)St.btlltu of the aano-lrlndinr IC wi th dynamometer, …
The included grinding wheels will probably sharpen at least 200 tips per side before needing replaced (Im still using the first side of the first wheel at about that count and dont plan to flip it any time soon). ... long run. So far, I have used it for a few weeks and it seems ok. I did buy some additional diamond disk from another source, as ...
Making a telpe about 10 years ago was one of the most rewarding projects I've ever undertaken. I ground the mirror and made every other component out of recycled materials as much as possible. This …
There are a lot of misconceptions about making a mirror - read this even if you don't plan to make a mirror, but just want to know how it is done - with your bare hands and a few simple tools, you can grind and figure a fine mirror with a surface accurate to a few millionths of an inch! Telpe Formulas and Design Comparator
In the case of ELID III grinding (Fig. 4), the ELID power source, conductive workpiece, coolant and metallic bond particles in the MRB–CBN wheel constitute a loop circuit. Therefore electrolysis occurs between the wheel and the workpiece through the coolant. ... In contrast, mirror grinding with fine abrasive wheels was achievable when ...
The worker should grind his mirror by the quicker, more conventional method about to be described. We Go to Work ... flush the mirror thoroughly and stand it, wet, on the testing rack. Using the window of the Foucault lamp, or any light source held alongside the eye, locate its reflection on the wet surface of the mirror. Move the light from ...
AGI can manufacture mirror blanks up to 40" in diameter; AGI can diamond machine ID holes into your mirror blank; AGI can produce elliptical mirror blanks in 45 degree and 90 configurations; AGI can manufacture mirror blanks from any of our low expansion materials; Need more than one telpe mirror blank? Quantity discounts are available.
The 100-inch mirror on the grinding machine. Photograph likely taken at the Pasadena optical shop of Mount Wilson Observatory.Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California. ... View source record on contributor's website. Title 100-inch telpe mirror ...
What are the best sources for mirror blanks? - posted in ATM, Optics and DIY Forum: Ever since I found Stellafanes mirror making page, Ive been itching to build my own telpe. Im going to start with a 6-8in. Newt (the classic beginning ATM project!). All I need now are the materials! I can find the yogurt containers pretty easily. For the rest of …
SSG/Tinsley started by grinding down the surface of each mirror close to its final shape. After this was done, the mirrors were carefully smoothed out and polished. ... Inside the chamber, engineers fed laser light into and out of the telpe, acting like a source of artificial stars. The test verified the entire telpe, including its ...
You need no special tools whatsoever to grind the mirror. Some sort depth gauge is helpful; a steel rule and some feeler gauges (buy this at an automobile parts store) will work well. ... And building a great telpe that will will give years of enjoyment will be a source of continuing pride and satisfaction. KNOWLEDGE: ...
To achieve the green and efficient processing of weak rigid large thin-walled aerospace parts, mirror milling systems are replacing traditional processing methods. A novel dual-robot mirror milling system consisting of a machining hybrid robot, supporting hybrid robot, and fixture is presented in this study. The cutter and the flexible supporting …
It embodies the "sub-diameter tool" design approach to making large telpe mirrors whereby the grinding tool is drawn across the mirror blank by programmable rotating arms. It was donated to NASM by the Lick Observatory in 1993 and shipped in March of that year. ... University of California Data Source National Air and Space Museum ...
Grits & Pitch. Grits and Polishing Compound are the consumables in the mirror making process. Grits, typically of Silicon Carbide or Aluminum Oxide, in various grades, are …