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Christiaan Huygens and his telpes

Lens grinding and polishing is very delicate and precise work. It is also very heavy manual work and very time-consuming. To lighten this hard labour for himself, Christiaan designed and built his own lens-grinding and -polishing machines (Figure 2). One of the greatest problems with lens grinding is to make a suitable lap by

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Telpe Mirror Grinding Machine | Crusher Mills, Cone ...

A grinding machine relieves the …, Sky and Telpe magazine starting on page 75 carries … A lot of work went into preparing the mirror for initial grinding! Grinding and Testing a Telpe Mirror – The St. John's …

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Making mirrors for giant telpes - SPIE Digital Library

Fine grinding and polishing of Segment 2 took less than half the calendar time as the same operations for Segment 1. Development of tests for the GMT off-axis segments was a major challenge. Like all modern telpe mirrors, they are measured with an interferometer and a null corrector, shown in Figure 12. The null corrector converts a ...

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Stellafane ATM: Materials & Tools

The Tools: Grinding & Polishing. You will need two tools: A hard tool for rough and fine grinding, and a soft tool, or pitch lap, for polishing and figuring. Traditionally, the pitch lap was made on top of the grinding tool. We recommend using plaster disks for tool substrates, and that you use separate disks for these two tools.

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Telpe Making Links - Designs and Techniques | STAR ...

Grinding with Washers Grinding Large Thin Mirrors Part I Grinding,Polishing and Figuring Large Thin Mirrors - Part 2 - Polishing Astronomy, telpe making,mirror grinding and testing Large Thin Mirror Making by Mel Bartels Grinding Machines Mirror-o-matic Tom Waineo's Desktop Grinding/Polishing Machine Ken Lilja's Grinding Machine Grinding ...

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Grinding Machine for Large Telpe Mirrors

Grinding Machine for Large Telpe 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 …

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Mel Bartels' Amateur Telpe Making

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.

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Constructing a Grinding Machine for large apertures - ATM ...

Page 1 of 2 - Constructing a Grinding Machine for large apertures - posted in ATM, Optics and DIY Forum: Ive been using a 4.5 equatorial from Orion for many years now and Ive finally got the time and money to build a telpe from the ground up. Unfortunately my local astronomy club has no-one with experience with ATM-ing. Given how interested I am on the …

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Telpe Mirror Grinding Machines | Crusher Mills, Cone ...

Mirror Making Machine – Welcome to the Fansler's. Bugger this for a Lark – A machine has got to be easier! I made my first telpe mirror, by hand in … could not afford the material to build a mirror grinding machine …

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Grinding the primary mirror of the Hubble Space Telpe ...

Grinding it down.. to the wrong specifications. Grinding it down very accurately to the wrong specifications. Black paint had chipped off a screw in the focal testing device, exposing the shiny metal, and they were focusing on that instead of the intended point light source. It was still focusing very accurately, just slightly off axis.

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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 telpe mirrors, which, at the time, were made of bronze.

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Mirror-o-Matic mirror making machine - ATM pages of ...

Mirror-O-Matic grinding machine. When I decided in 2009 after a ten-year break to get into mirror making again, it quickly became clear to me that I would need to construct machine, as hand grinding big mirrors is not something very beneficial for the hands of a musician.

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Universal Photonics > UPI Products > Consumables

telpe making & optics We are proud to bring you the finest products for your mirror-making needs. Here you will find the materials and tools necessary to produce a mirror, as well as recommended grinding and polishing steps to assure minimum "sub surface" fractures.

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M-o-M Free Preview

Mirror-o-Matic was designed to be a very low cost astronomical mirror grinding, polishing and figuring machine. Its attributes are: 1. It can be built for somewhere between $200 and $400. 2. It is constructed of hardware store items and it needs no machined parts. 3. It is constructed primarily of 3/4 inch plywood and has few close tolerances. 4.

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Mophorn Drywall Sander 850W Electric Drywall Sander ...

CO-Z 850W Drywall Sander with Vacuum Attachment Dust Collector, Electric Pole Sander Machine for Wall Grinding with Extendable Handle 5-Speed LED Lights and 12 Sanding Discs 2 $159.99 $ 159 . 99 Goplus 750W Drywall Sander, Electric Foldable Sander Machine w/Dust-Free Automatic Vacuum System, 6 Variable Speed 800-1750 RPM, Double-Deck LED Lights ...

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Making a homemade mirror grinding machine - ATM, Optics ...

Making a homemade mirror grinding machine - posted in ATM, Optics and DIY Forum: I want to make a motorized mirror grinder, any good info on this, i have a couple geared motors, low speed high torque. One more question ...will 1 1/2 shaft size pillow block bearings work good for a homemade EQ mount? Thank you, John

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How I built an edge grinder for telpe mirror blanks.

I borrowed a few ideas from the Mirror-O-Matic mirror grinding machine, particularly how to mount the turntable on top of the pulley. Anyone building machinery for cold-working glass should have a look at the MOM web site and plans. There are lots of good ideas there. The large wood circle will become the base of the turntable.

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How telpe is made - material, manufacture, making ...

A telpe is a device used to form images of distant objects. The most familiar kind of telpe is an optical telpe, which uses a series of lenses or a curved mirror to focus visible light. ... 9 The polishing machine is similar to the grinding machine, but the tool is made from pitch—a thick, soft, resinous substance derived from ...

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A Modified near-draper, near- MOM telpe grinding …

Bill W, Ian K, David G, and I (Guy B) modified an existing quasi-Mirror-O-Matic machine by changing pulley ratios and changing it into sort of a Draper machi...

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Making two matching 30 inch [0.76m] F2.7 telpe mirrors ...

Mel grinding the back side of a 30 inch mirror over a full sized tiled tool; you can see the other 30 inch in the left background. Rough grinding is hard and messy. After rough grinding most of the tool is in contact with the mirrors though it is clear that some of the Hydrostone leaked under the tiles. I spent 3 hours apiece, total of 6 hours.

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Metals and Alloys: Advanced Rotary Surface Grinders ...

Grinding is also often utilized to remove significant amounts of material to bring a stock sheet or plate to precise dimensions. To do this, machine shops primarily utilize surface grinders with a reciprocating table and a horizontal spindle that turns the grinding wheel, but the process is very slow.

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How I Make Light-Weight Hexagon or Honeycomb Telpe ...

Rough grinding is complete for the 12.5 inch honeycomb-back telpe mirror blank. The rough grinding went pretty quickly and painlessly this time. I only have maybe 12 hours of actual work in the mirror so far. It's hard to believe, but the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15 ounces.

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Mike's Telpe Workshop

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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CNC Optical Grinding Machines | OptiPro

PZX 5-Axis Prism Grinding Machine. The PZX prism grinding machine is the latest solution for companies looking to enhance their prism manufacturing capabilities. Machine prisms up to 6″ thick with a maximum diameter of 10″ for the longest diagonal.

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Explore how telpe mirrors are made | Astronomy

Making a telpe 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 …

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Telpe mirror glass casting - YouTube

this latest installment, we show the preparation for the glass casting. At the end, we show our home-made way to grind the ed...

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Mirror-o-matic

The Machines: Documentation: Information for ATMs Zip archive of Mirror-o-Matic Yahoo Groups (2000-2019) 307 Contact Dennis ...

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Waite Research :: 15" F4.5 Telpe Mirror

A look at a 15" Telpe Mirror, with Ronchi history. The fabrication of this 15" F4.5 primary telpe mirror began with a planoplano blank. I used my own diamond grinding equipment to generate the rough curve here. After the generation, I poured a steel grinding tool and used #40 silicon carbide abrasive to get the mirror close to the ...

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Mirror Grinding Machine | Hackaday

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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NEWPORT GLASS WORKS, LTD. & NEWPORT INDUSTRIAL GLASS, …

To begin grinding operations a small pan partly filled with #220 or #240 carborundum or Aloxite mixed with water is placed nearby with a one inch paint brush in it to apply the mixture to the surfaces. ... You are referred to Amateur Telpe Making, books 1,2 and 3, S & T Gleaning, De Vany Texereau, et al. We left off above with two ...