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 telpe mirrors starting with a 24-inch and then a 60-inch mirror for a telpe initially intended for the Yerkes Observatory.

Telpe Mirror Blanks Providing telpe mirror blanks and kits to telpe makers. Mirror blanks are individually tested for internal strain. Plastic protractor inserted under a 6 inch mirror blank during a stress test, to illustrate what stress would look like - if there were any present.

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 telpe mirror blank that I made myself.

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The I.A.U. named asteroid 17823 Bartels discovered 1998 by J.M.Roe in recognition for my contributions to amateur astronomy. Making is the Key to Knowing. A telpe mirror is arguably the most accurate surface made by human or machine. Amazingly you can grind a mirror by hand and make a telpe with simple hand tools.

The high precision of our precision surface grinding services is the embodiment of CNC grinding machine quality, it directly reflects on the production quality of machining parts. Due to the high precision requirement of CNC grinder, it is required to optimize the structure of the machine tool, adopt high-grade functional components, and have ...

The Cranfield Precision OGM1600 is the only machine in production being used to manufacture the next generation of mirrors used in the semiconductor industry. Within 5 years, most of the semiconductors in the world being used in high end phones, computers etc. will be manufactured using light guided by mirrors that were ground on the Cranfield ...

Grinding and Polishing Guide. Grinding should commence with the finest grit size that will establish an initially flat surface and remove the effects of sectioning within a few minutes. An abrasive grit size of 180-240 [P180-P280] is coarse enough to use on specimen surfaces sectioned by an abrasive wheel. Hack-sawed, bandsawed, or other rough ...

Here is a blank with the rough edge ground down and trued up. It only takes a few minutes on the grinding machine I built for the job. Here is the super simple grinding machine I built to true up the edges of the blanks. It is just an angle grinder with a …

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- Washing machine on the spin cycle, according to legend. Don't know anyone that has actually *done* that though. ... humping the corning of the bathroom sink so you can see yourself in the mirror also works wonders . Report abuse. cherry4 Feb 04, 2014. Haha haha to see the expression.

developed a grinding machine for the 60-inch mir-ror, and began his famous series of photographs of nebulae. In 1904 he moved, with Hale, to the new Mount Wilson Observatory at Pasadena, where he had major responsibility for the design and construc-tion of the mirror, mount, accessories, and dome of the 60-inch telpe, a task which he carried

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 …

Measuring the Radius on the 20" Mirror. DIY Spherometer, Part 1: The Build. DIY Spherometer, Part 2: Calibrating and Using the Instrument Recycling Pitch for Laps for the the 20" Quartz mirror. Pouring a 15" Pitch Lap. Channeling a 15" Pitch Lap. Fine Grinding a 20" Quartz Telpe Mirror. Rough Grinding on the Fixed-Post Mirror Grinding Machine

• Grinding ±0.008mm • Lapping ±0.005mm Surface finish, roughness Casting • Die Casting Good 1-2µm • Investment Good 1.5-3 • Sand Casting Poor 12-25 Metal forming • Cold rolling Good 1-3 • Hot rolling Poor 12-25 Machining • Boring Good 0.5-6 • Drilling Medium 1.5-6 • Milling Good 1-6 • Turning Good 0.5-6

Document sans nom. They may be classified into three main groups : Draper/Hindle-type machines : This is the mother of all machines. Its principle seems to have been elaborated by Huygens, about 1738, and improved by Lord Rosse, and more recently by Henry Draper, an American astronomer. Here are the different parts which compose this machine ...

Mirror Grinding Machine. Mirror Polishing Machine. Small Grinding & Polishing Machine . Edging Machine. Null Tester. Focussing Units. Tube Fittings. Worm Drives. Perforating. Optical Workshop Equipment. Spindle Nose & Adaptors. Slip Ring Seting Circle. Mirror Cell ...

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Internal Grinding Machine, 1 of 21 . Material: Hy-Lift Johnson only uses castings and forgings of the highest quality material that are 100% made in the USA. Our casting supplier has been supplying us for more than 60 years. ... you need to see yourself use the mirror in the bathroom and leave the Cam Face surface finish to the people

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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 Telpe Making" Book 1. A bowl which rotated was fitted to the spindle. I also built another machine of the same type.

Elgin Mirror Grinding Machine Campus Rugby 2019. 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. Mirror Grinding Machine My Mirror Grinding Machine. For a long time I''ve wanted to build a machine for grinding telpe mirrors. Elgin-Waineo machines : .

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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 …

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The true test of the amateur astronomer is building their own telpe. Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by hand, Laurie Hall built...

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