mirror grinding paraboloid
Joy of Mirror Making: Rough Grinding - BBAstroDesigns
The mirror (or tool) was then carefully placed on top of the tool (or mirror) and grinding started (i.e., pushing the glass disk on top back and forth). The procedure was quite similar to grinding a smaller mirror, except that the disks are heavier.
Making Your Own Telescope - Dover Publications
During the figuring process, the surface of the mirror is polished from a sphere to a paraboloid using the appearance of fringes in the Ronchi test and shadows in the Foucault test. These tests are qualitative and serve only to guide the figuring process.
Hyperbolic / Parabolic mirror question - ATM, Optics and ...
Telescope Mirror Grinding Machines ... Mirror grinding machine construction log – JamesCrombie.com page1. ... spin-cast paraboloid is not sufficiently accurate to permit its immediate use as a telescope mirror or lens, so it is corrected by computer-controlled grinding machines.
Mirror grinding | Hacker News
Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.
Amateur telescope making - Wikipedia
After fine grinding, the mirror has to be polished. The tool - made from plaster - is the same as used for fine grinding but now carries a special polishing layer. The polish commonly used is cerium oxide. In the later stages, several other tools, coated with polishing pitch are in use.
So you really want to build a Telescope Mirror. - Astronomy
A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids.Usually, the objects are made of glass.The furnace makes use of the fact, which was known already to Newton, that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid, identical to the shape of a reflecting ...
Rotating furnace - Wikipedia
Chapter Two: Grinding With the 120 Grit, June 11, 2000 My mirror is hyperbolic. In my zeal to achieve an f/8 curve so quickly, I ground out the center of the mirror far more than the required depth. In my zeal to achieve an f/8 curve so quickly, I ground out the center of the mirror far more than the required depth.
Optics - Norway's largest optical telescope
Parabolic mirrors Circular paraboloid One of the world's largest solar parabolic dishes at the Ben-Gurion National Solar Energy Center in Israel A parabolic (or paraboloid or paraboloidal ) reflector (or dish or mirror ) is a reflective surface used to collect or project energy such as light, sound, or radio waves . Its shape is part of a circular paraboloid, that is, the surface generated ...
Wooden Telescope Part 1: The Mirror - 11 - Instructables.com
The fixed-post grinding machine is simple but effective. Exerting 0.75 horsepower, it makes the grinding, polishing and figuring of the 62 centimeter primary and 20 centimeter secondary mirror possible by smooth movement and even distribution of stresses over …
Off-Axis Paraboloid and Ellipsoid Mirrors | Photonics ...
My dad (Tom Johnson) founded Celestron. His key idea was a way to create the corrector plate at the front of a Schmidt-Cassegrain telescope. The corrector plate compensates for spherical aberration (the difference between a parabolic main mirror and a spherical main mirror).
- WOS - Wenk Observatory Solutions
Fine grinding: I change from my rough grinding area to my fine grinding and polishing area after 220, not before. #220 is still gritty stuff. The "W" stroke: This is a casual way of describing any stroke that goes forward and backward while progressing left to right or right to left on the mirror.
telescope mirror grinding - YouTube
It seems that even people making their own primary mirrors contend with buying diagonal mirror from commercial sources. Part of it may be that making a good diagonal is a more demanding job that grinding and polishing a lot larger paraboloid mirror which it will be used with - draw your own conclusions from it :-) ...
Mirror Technologies for Giant Telescopes
Manufacturer of parabolic mirrors. Mirrors are shock resistant. Specifications include tempering range from 1/8 in. up to 2 in. & glass size range from 1 in. up to 36 in. x 72 in. Capabilities include cutting, edge grinding, convexing & bending, surface lapping & polishing, hole drilling & chemical strengthening.
tut44 Making A Mirror Grinding Tool
31 rows· The Joy of Mirror Making ... length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you. ... But the shape that will focus light coming from distant astronomical objects to a single point is a paraboloid. Because the ...
ParabolicMirror | asphericon
Is it practical to hand grind a convex parabolic or hyperbolic mirror? ... does anyone know of a way to do that sort of grinding? ... The refractive part of the light path creates a situation that if you test it as a sphere or paraboloid in that way (I forget which) the actual curve you get is a hyperboloid. ...
mirror grinding paraboloidmirror grinding popular
Do you have any experience Paraboloid Mirror grinding in CNC machine? ... Reply. Glass Grinding Machine Wholesale, Grinding Machine ... Glass Grinding Machine, ... glass grinding machine, mirror beveling machine. ... 2017 Most popular fine grinding CNC double station glass round corner machine.
OSA | Stressed mirror polishing. 2: Fabrication of an off ...
Oct 15, 2004· Page 1 of 3 - Hyperbolic / Parabolic mirror question - posted in ATM, Optics and DIY Forum: OK, SO I know that all standard newt mirrors are parabolic, which will be defined as y = z(x^2) and have a focal point, yadda yadda... I understand parabolic just fine, I like the math, Im happy But I know some mirros are HYPERbolic, y= z/x. The Epsilons are an example.
Make a PARABOLIC Mirror the cheap way PARABOLOID DIY ...
paraboloidal mirror A concave mirror that has the form of a paraboloid of revolution. The paraboloidal mirror may have only a portion of a paraboloidal surface through which the axis does not pass, and is known as an off-axis paraboloidal mirror.
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