ritchey telescope mirror grinding machine


How I built an edge grinder for telescope mirror blanks.

The first thing I built was an extension that sits in the middle of the turntable to raise the working surface above the height of the dam. It was made from an 18 inch diameter tabletop and some scrap lumber. I drew concentric circles on the top of the tabletop in the sizes of common telescope mirror …

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George Willis Ritchey: Astrophotographer

Ritchey wore many hats. He was an astronomer, a telescope designer, and an expert optician. He took the technology of mirror grinding to new levels of perfection —such that his 60-inch mirror grinding machine now rests in the Smithsonian. He is the "R" in the RC optics used in most large telescopes today, such as the Hubble Space Telescope.

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Replicating Ritchey Mirror grinding machine - ATM, Optics ...

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 …

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Using the Fixed-Post Grinding Machine for Rough Grinding ...

Gordon Waite sets up his fixed-post mirror grinding machine to begin rough grinding on an 11" f/4.3 telescope mirror. He uses a grinding tool made from dent...

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ON THE MODERN REFLECTING TELESCOPE, AND 'rHE MAKING

GRINDING AND POLISHING MACHINES. TIlE grinding and polishing machines used by the writer are somewhat similar in principle to Dr. Draper's machine, sho.wn in Fig. 25 of his book, but are more elaborate. I shall describe here the machine used in making the 5·foot mirror, both because it embodies most of the essential features of a-grindingand ...

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mirror grinding machine for sale - mayukhportfolio.co.in

Mirror Grinding Machine. telescope mirror grinding machine based on Dennis Rech's M-o-M 20. Read more. SkyBadger - Mirror Grinding Machine. I have a Mirror-o-maticmirror making machine that I swapped with MikeMS for a Newtonian telescope that was no use to me. ... The grinding machine had been built to the design of the mirror-o-matic design of ...

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GRINDING A TELESCOPE REFLECTOR WITH TOOL …

Grinding telescope reflectors of 15-inch diameter and over makes it necessary to employ a motor-driven turntable. Small mirrors are generally ground and polished by rotating the tool, fastened to the turntable, and working the mirror blank by hand either in straight or in circular strokes over the tool. In this case the overhang of the mirror ...

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Orion 10-inch f/8 Ritchey-Chrétien astrograph telescope ...

Figuring a hyperbolic mirror is a complex and expensive technique, but thanks to modern, computerised mirror-grinding technology, these telescopes are now no longer the exclusive preserve of professional observatories, and are now within the realms of affordability for advanced enthusiasts.

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Mirror Grinding Machine » Leonardo Da Vinci's Inventions

The mirror or lens grinding machine is a masterpiece of mechanical engineering. It has several gears in mesh at all times and also has several variable settings built into it. This machine was most likely designed by Leonardo while he was either investigating the different ways that light reflected off things or maybe he was planning on ...

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HAROLD J. ABRAHAMS St. Davids, Pennsylvania

grinding of the 100-inch mirror and designed its mount. In 1910 Ritchey met Henri Chretien, who col-laborated with him in improving the optical design of photographic mirrors. Chretien computed the curves for a combination of reflecting surfaces discovered by Ritchey, a modification of the Cassegrain telescope, which had the advantages of ...

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Dick Parker's Telescope Mirror Workshop: Cassegrain ...

The Cassegrain telescope is probably the first type telescope that the ATM would like to make after mastering the basic Newtonian telescope. ... The Ritchey – Chretien, on the other hand, has two hyperbolic mirrors so chosen that both spherical aberration and coma are corrected. ... This optic is small enough that a lens grinding machine ...

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10Inch Ritchey Chretien Cassegrain ATM Project

10" Ritchey Chretien Cassegrain ATM Project Jump ahead to: The mirrors The mechanical components Aluminum coating The finished telescope Adding a guide scope Collimation Rebuilding the mirror support. I had made Newtonian telescope mirrors before ann two classical Cassegrains of 8inch and 17.5inch aperture.

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telescope grinding machine optical instruments

Dec 2, 2013 - telescope making, mirror grinding, homemade tripod, eyepieces, astronomy. Dec 2, 2013 - telescope making, mirror grinding, homemade tripod, eyepieces, astronomy ... Carl Zambuto is polishing a telescope mirror in his optical shop. Carl's mirrors are highly prized for their smoothness and perfection-! ... because there is a far cry ...

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Grinding Machine for Large Telescope Mirrors

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 ...

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telescope mirror grinding machine

Apr 29, 2010· Fine Grinding a 20" Quartz Telescope Mirror. Rough Grinding on the Fixed-Post Mirror Grinding Machine. Hogging the Curve on a 20" f/4.5 Quartz Telescope Mirror. Astronomy magazine names Waite Research's Renegade telescope a top astro product of 2015. The 20" Renegade telescope offers fabulous viewing without climbing a ladder.

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Rough Grinding a 20" Quartz Telescope Mirror on the Fixed ...

This video shows how to setup a mirror grinding machine for fixed-post grinding, also known as spin grinding or spinning. After setup, you'll see how abrasi...

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Astro-Tel - Mirror grinding machine

MIRROR GRINDING MACHINE. I made my first mirror grinding and polishing machine over thirty years ago. It used the working principle of the machine illustrated at "A" Fig.3, Page 163, "Amateur Telescope Making" Book 1. A bowl which rotated was fitted to the spindle. I also built another machine of the same type.

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Mirror Grinding Machine - ATM, Optics and DIY Forum ...

Mirror Grinding Machine - posted in ATM, Optics and DIY Forum: I have some interest in building a grinding machine for possible up to an 18 mirror, but something that will also do a 6 or 8 mirror. I have plans for the Mir O Matic but would like to do something a bit more modern. I have some ideas about using a AC drive and a large aluminum disk for the turntable and have made a parts list …

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Ritchey Telescope Mirror Grinding Machine - YouTube

Excerpt from VHS video made at the Lick Observatory optical shops in Santa Cruz, CA before the object was acquired by the Smithsonian. Circa 1985.

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Document sans nom - Astrosurf

Document sans nom. A history of polishing machines. As often in sciences and technology, Leonardo da Vinci was a pioneer, creating machines for the production of optical devices. Indeed, between 1513 and 1517, he imagined machines to grind and polish telescope mirrors, which, at the time, were made of …

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Astro-Tech Ritchey-Chrétien optics | Astronomics.com

Optical features of this Optical Tube . . . Ritchey-Chrétien optical design: This Astro-Tech optical tube is a true Ritchey-Chrétien (R-C) reflector optical system.Unlike a Maksutov-Cassegrain or Schmidt-Cassegrain catadioptric scope (that uses simple spherical mirrors and corrector lenses), or Newtonian reflectors (that use a coma-producing parabolic primary mirror), this Astro-Tech R-C is ...

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100-inch telescope mirror on grinding machine — Calisphere

100-inch telescope mirror on grinding machine at Mount Wilson Observatory's Pasadena laboratory.Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.

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George Ritchey | Guy's Math & Astro Blog

Posts about George Ritchey written by gfbrandenburg. Also compare that to the theoretically perfect computed ronchigrams from Mel Bartels' website:. Part of the reason this mirror has taken so long is that after grinding and polishing by hand some years ago, I finally did a proper check for strain, and discovered that it had some pretty serious strain.

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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 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.

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The Perfect Machine: Building the Palomar Telescope ...

In December 1945, work resumed on the mirror. In October 1947, it was pronounced finished and ready to install in the telescope. Eleven and a half years had elapsed since the grinding machine started to work on the disc. Shipping the mirror from Pasadena to …

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Mike's Telescope Workshop

I finally decided it was time to build a machine to help me grind the edges of the blanks true and round. This is my home-built edge grinding machine for grinding down my home-cast mirror blanks. Click to see the whole project. This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telescope mirror blank that I made myself.

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Discovering Mount Wilson Chapter 14: The 100-inch Telescope

George Ritchey, master optician, designed this machine to figure the parabolic surface of the 100-inch mirror. Here the mirror can be seen in its horizontal position with the large grinding tool above and to the right. Photo: Carnegie/ Huntington Library

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Making a Mirror grinding & Polishing machine - ATM, Optics ...

Page 1 of 5 - Making a Mirror grinding & Polishing machine - posted in ATM, Optics and DIY Forum: Hello, I am on the half of the way to make a mirror grinding machine inspired by original M-O-M design. I made the pulley arrangement such a way that, both the turn table & eccentric spins at 50 RPM fixed. I wont go for making mirror bigger that 10.5 (or max 12).

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Making mirrors for giant telescopes - SPIE Digital Library

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 ...

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Mirror grinding - Telescope making

A good starter size is the 150 mm (6") mirror. A 200mm (8") will also work. Most ATM books and websites recommend a Pyrex® mirror blank, but in my opinion, annealed plate glass is better for this first, "learn and practice" mirror.It is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like Pyrex has no practical (visible at ...

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Stellafane ATM:Mirror Making Myths

A 6" or 8" mirror should take about 40 to 80 hours of effort. While this is a non-trivial amount of time, the mirror can be completed in a few months, and certainly within a year. Most people work one to three hours a day on their mirror about one or two times a week. Homemade Mirrors are …

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Fast manufacturing of E-ELT mirror segments using CNC ...

In the most preferred optical design Ritchey Chretien (RC), both primary and secondary mirrors are hyperboloid. ... telescope (ELT) segmented mirrors such as in the E-ELT project. The grinding ...

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amateur observing - How is it ensured that a parabolic ...

That's sometimes what you actually need (if you make a hyperbolic mirror for a Ritchey-Chretien telescope). Or if you stop too early, the mirror is elliptic, which is used in other designs. The parabola is the thin edge between the elliptic and hyperbolic domains. You start with a mirror where the cross-section is a circle (spherical mirror).

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Robotic mirror grinding? - ATM, Optics and DIY Forum ...

PeteDCard81, on 21 Jun 2021 - 10:11 AM, said: The Hubble primary mirror was designed to the correct specification (parameters) but ended up misshaped because of an incorrectly assembled null optics test tool. This test tool was acquired from the Perkin Elmer side of the shop that did work on Defense projects.

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Machine For Grinding Telescope Specula - ChestofBooks.com

Machine For Grinding Telescope Specula W. Forgan The simple addition to an ordinary lathe for the purpose of grinding telescope specula has been of so much benefit to the author that it was thought, if made known through the medium of the Society of Arts, it might become useful to others interested.

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Amateur Telescope Making Main Page - Stellafane

Grinding a Mirror "For it is true that astronomy, from a popular standpoint, is handicapped by the inability of the average workman to own an expensive astronomical telescope. It is also true that if an amateur starts out to build a telescope just for fun he will find, before his labors are over, that he has become seriously interested in the ...

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