This object is on display in the Space Science at the Steven F. Udvar-Hazy Center in Chantilly, VA. This is the electric motor that replaced the original overhead belt-driven drive on the mirror-grinding machine built by George Willis Ritchey at the Yerkes Observatory in Williams Bay, Wisconsin, in.Jul 28, 2021 Making a telescope mirror To start, a new mirror blank is “sanded” down to create a precise parabolic curve in a process called grinding. To do that, the blank is paired with a device called a grinding tool, usually made of glass, plaster, or ceramic. Unlike typical sandpaper strips, the so-called sandpaper used in grinding Explore how telescope mirrors are made.
Mirror grinding machines 2018-08-11T18 08 51+00 00 Mirror Grinding Machine My Mirror Grinding Machine For a long time I've wanted to build a machine for grinding telescope mirrors Dennis Rech's MoM designs finally inspired me to just get up and do it Over the years, I'd been collecting motors, gear boxes, pulleys, etc.
The Kutter Schiefspiegler. Yolo Telescopes. Grinding Glass. An ATM's Grinding Barrel Top. Grinding Your Telescope Mirror. Polishing Your Telescope Mirror. Glass Notes. Grit and Microgrit Grading Conversion Chart at READE. Making a tile on plaster tool.
George Willis Ritchey built this mirror grinding machine at the Yerkes Observatory in Williams Bay, Wisconsin, in the late 1890s. Under the sponsorship of George Ellery Hale, the machine was used to grind a series of telescope mirrors starting with a 24-inch and then a 60-inch mirror for a telescope initially intended for the Yerkes Observatory.
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. Most of them came from industrial junk yards.
Grinding Machine for Large Telescope Mirrors. I designed and built a grinding machine for mirrors up to 42 inches [1.1m] in diameter. By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. The machine can also work smaller mirrors if the drip pan is moved to the fast shaft on.
Silicon carbide (SiC) is the most advantageous as the material of various telescope mirrors, because SiC has high stiffness, high thermal conductivity, low thermal expansion and low density and so on  . However, since SiC is very hard, it is difficult to obtain the surfaces efficiently by using ordinary grinding method. Therefore, we developed the ultra lightweight mirror by ELID.
Feb 10, 2013 Reason is because a Ritchey Chretien uses two hyperbolic surfaces and is a complicated optical design. Spacing is critical. A Newtonian is much simpler in optical design and uses only one parabolic surface and a flat secondary mirror. There is actually plenty of information on how to make a Ritchey Chretien.
Stone tools go back 3.3 million years. Pounding, scraping, knapping, grinding combined with fire, heat, melting leads us today to grinding telescope mirrors from glass. Making a telescope mirror is one of the most satisfying and sublime joys you will experience. It's also arguably the most accurate surface made by man or machine. If the mirror.
Hale had hired George Ritchey as optician and telescope builder at Yerkes. provided much of the funding for a new polishing lab built in 1990 and equipped with an 8 m grinding and polishing machine and a 24 m test tower, which were first used to figure the 3.5 m mirrors. 94 cast 6.5 m mirrors for the MMT (replacing the six 72 inch.
Therefore we choose the Elgin for the machine type. It will be based on the Elgin machine described in the Maksutov Circulars. The frame of the machine will be based on the machine (see photo below) that Prof Ritchey used to ground and polish the 60-inch Mount Wilson mirror. It gives us the ability to swing the grinding table from horizontal to.
Amateur Telescope Making Book 3 A Optical Production Methods and Machinery 1 A.1 Grinding and Polishing Machines 3 A.1.1 Ritchey's Description of His Machines 8 A.2 Machine Polishing Mirrors 17 A.2.1 Types of Machines 18 A.2.2 Continuous Polishing 20 A.2.3 Figure Obtained by Machine Polishing 20 A.2.4 Polishing Face-up 22 A.2.5 Hypocycloidal.
Nov 01, 2011 Basically there are two types of grinding polishing machine. The ‘traditional’ type which involves the mirror rotating at a relatively slow speed, a few rpm for a big mirror (16-20 inches) with the tool moving across the mirror, from side to side, at a higher.
Oct 15, 2012 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 able to polish a mirror spherical.
Mar 06, 2006 Replicating Ritchey Mirror grinding machine - posted in ATM, Optics and DIY Forum Ive just returned from a few days with friends in Washington, DC. Being aviators and aircraft builders, we blew a whole day at the new Air Space Museums new annex at Dulles airport.What really caught my attention however, was that they moved the Ritchey mirror making machine from the old Paul.