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How to Make Your Own Telpe Mirror - Instructables

How to Make Your Own Telpe Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40"x40" and 0.75" thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter …

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Newport Glass Works, LTD. Grinding, Polishing and Figuring ...

There are several ways to support the grinding and polishing machine turntable, but first make sure the turntable itself is rigid. It must not bend. If your machine lacks a sturdy turntable, one way to make one is to cast it out of Kerr plaster 4" to 5" thick. One way to support the mirror is to block the mirror right to the base ...

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Reflecting telpe wiki | TheReaderWiki

Some telpes use primary mirrors which are made differently. Molten glass is rotated to make its surface paraboloidal, and is kept rotating while it cools and solidifies. (See Rotating furnace.) The resulting mirror shape approximates a desired paraboloid shape that requires minimal grinding and polishing to reach the exact figure needed.

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Making a 250mm f6.4 parabolic mirror.

Making a 250mm f6.4 parabolic mirror. 1: Preparations. First things first: this section lists some initial things to do, such as purchase the raw materials and cut out a glass disk. ... I think in the meanwhile i will try to make a set of 1:10 pulleys for a V-belt. I've also started constuction of a grinding bench. The top surface is a circular ...

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Research on the error analysis and compensation for the ...

Accordingly, the method is applied to the detection of large-diameter aspheric parabolic mirror online or in grinding process; the manufacturing quality …

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grinding an optical flat mirror - Reiner Vogel

Fine grinding. A flatness in the range of 1 µm can be reached by grinding three glass blanks alternatingly against each other, blank 1 on 2, 2 on 3, 3 on 1, and so on. This will be continued with each Carbo grade. After fine grinding, one of the blanks is picked as the future flat mirror and will be polished.

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Flexing Spheres into High-Quality Telpe Mirrors

required paraboloidal mirror. Genera-tions of amateur telpe makers have been taught to proceed by first grinding and polishing a smooth sphere, and then to modify the sphere into a paraboloid. And therein lies the difficulty. While a spherical surface will arise somewhat naturally from normal grinding and pol-ishing action, a parabolic ...

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Stellafane ATM:Mirror Making Myths

With the Mirror on top, the tool on the bottom, and coarse grit in between, we start grinding with the mirror overhanging the tool. We rub the center of mirror against the edge of the tool, and this wears a depression in the center of the mirror (the edge of the tool wears down also, so that the tool becomes convex (a "hill" in the center) and ...

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Off-Axis Parabolic mirrors

mirrors are available in multiple configurable options. Our applications engineers can work with you to determine the specifications you need. Off-Axis Parabolic mirrors AOS manufacturing Capabilities Aperture Optical Sciences, Inc. 27 Parson Lane, Unit G Durham, Connecticut 06422 T: (860) 316-2589 F: (860) 760-6564

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Homemade Telpe Making - Google Search

A table saw covered with layers of newspaper about 1/2 inch thick (to support the mirror and tool) was used as the grinding stand. A "wet" began by spraying the disks with water and smearing a small amount of grit over the tool (or mirror) with my fingers. The mirror (or tool) was then carefully placed on top of the tool (or mirror) and ...

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Grinding Telpe Mirrors, Then and Now | Consortium for ...

The master craftsman, Roger Angel, who has been making telpe mirrors for 30 years, or its the technicians arranging—arranging not simply throwing into the mold—chunks of glass (pictured above), or those grinding and polishing the mirror, success depends on just knowing when you've done it right. Or, as Angel says, "Not only is it devilishly hard to grind …

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optics - Is it practical to hand grind a convex parabolic ...

I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters generated by focusing light off the mirror, and that procedure clearly can't be used (unmodified) with a convex mirror.

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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 paired with a device called ...

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Ultra-precision grinding - ScienceDirect

In ultra-precision grinding the application of grooved grinding wheels is mainly surface finishing, wafer grinding, thinning and mirror grinding with cup wheels. 4.2.4. Dicing blades. Dicing blades with thickness of 10 μm–1 mm are used for precision cut-off grinding.

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Pieces Knowledge: Basic Knowledge of Optical Lens Grinding ...

1 grinding dish: used for grinding lens. 2 fixture: used to hold the optical lenses for fine grinding. 3: relay equipment: the joint between machine and grinding dish, the height and coaxiality is adjustable. 4 dishes: used to repair the accuracy of the drill plate. 5 drilling dish: it is used to correct the precision of grinding plate ...

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Lens & Mirror Making Best lenses and mirrors are both made ...

• For mirrors only surface needs to be good • Typical mirror want pyrex (eg BK7) • Then need a tool blank – poorer glass & softer glass • Place mirror on top tool • Now add grinding compound (grit) between tool & mirror • Grinding – moving the mirror over the tool with grit between) • Grinding compound will make tool convex ...

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Parabolic Mirror Grinding Machines | Products & …

Products/Services for Parabolic Mirror Grinding Machines. Grinders and Grinding Machines - (987 companies) Grinders and grinding machines use an abrasive that is bonded to a wheel, belt or disc to remove material and improve surface finish. Devices can be pneumatically driven or powered by a combustion engine or electric motor.

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Can we grind a parabolic mirror with sandpaper instead of ...

Answer (1 of 7): Not and be optically accurate. I used to grind mirrors as a teenager about 55 years ago. The best text on mirror grinding and figuring I ever encountered was the three volume set of "Amateur Telpe Making" written by Albert Ingalls and published by Scientific American. My loca...

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The Most Useful Paraboloids. The eyes we built to see into ...

Mechanical processing of highly precise parabolic glasses is not efficient and requires lots of grinding and polishing. Assuming the mirror is polished to a high-quality surface of the desired shape, the bigger the primary mirror is — the more signal it will be able to collect (the bigger is its image resolution) and better is the sensitivity.

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Stellafane ATM: Measuring Sagitta

Calculating Sagitta. Before you start grinding, you should have decided on your mirror's desired focal length. The two most common beginners' mirrors, the 6" f/8 and 8" f/6, both have 48" focal lengths. Use this formula to calculate your target sagitta: Sagitta (s) = Mirror_Radius2 / ( 4 × Focal_Length ) = r2 / 4F.

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Making a parabolic mirror - YouTube

Metal Spinning of a parabolic mirror.diameter: 18,5 inch

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Diy mirror grinding aspherical : telpes

You can definitely grind a parabolic mirror by hand. I have seen many videos of people doing it. You start by grinding a spherical mirror. Use a pottery wheel type setup to help this process go faster. Once you have a decently shaped and polished spherical mirror you can start the "figuring" process to make it parabolic.

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tut44 Making A Mirror Grinding Tool - Asterism

Making A Mirror Grinding Tool By Allen Malsburry The average person would never think, "I can make my own telpe." Most amateur astronomers believe, "I can buy a better telpe than I can build." Neither is actually correct. For many decades now, amateur astronomers have been building their own telpes. ...

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Parabolizing a Telpe Mirror - BBAstroDesigns

Lengthening and widening the stroking using mirror on top is arguably the most popular technique for mirrors up to 12 inches [30cm] in diameter. It's well described in popular telpe making books. For larger and faster mirrors, this approach has trouble achieving the deeper paraboloidal curves; zones also become an issue.

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Which mirror testing equipment is easiest to make? - Page ...

Page 3 of 4 - Which mirror testing equipment is easiest to make? - posted in ATM, Optics and DIY Forum: Dave, what tricks can you recommend to get the polishing right? What did you need to learn? When I get to that stage, I will be doing silicon carbide of course, 120,220,500 grit, and then switching to 9,5,3 WCA Microgrit from Germany followed by CER …

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Turning a spherical mirror into a parabolic mirror - ATM ...

in my experience from grinding and polishing a 6" f8, and from reading a lot about it, the natural random motions of grinding and polishing two pieces of glass together will naturally result in a spherical mirror. to make it a parabolic mirror involves, i read, not very much more polishing, a couple of minutes maybe, if done in the right motions. a spherical mirror has a …

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What is parabolic mirror? - Quora

Answer (1 of 3): First, it's important to know what a parabola is. A parabola is defined by the Merriam-Webster dictionary as "a plane curve generated by a point moving so that its distance from a fixed point is equal to its distance from a fixed …

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Making a tin mirror. Grinding without tool. - ATM, Optics ...

Page 1 of 2 - Making a tin mirror. Grinding without tool. - posted in ATM, Optics and DIY Forum: Im making a tin parabolic mirror which is 8 inches. Telpes used to be made of mostly copper and some tin but i wanted to see what would happen with just tin. I have no tool to grind it so i was wondering if it would be possible to grind without a tool into a hopefully …

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

$begingroup$ Also, in grinding the precision is far too low to even matter whether you're aiming for a sphere or a parabola. It doesn't matter at all. Don't waste your time making jigs. The emphasis in this stage is not on precision, but on removing glass (rough grinding) and smoothing out the surface (fine grinding).

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Telpe Mirror Grinding Machine

Making my own fixed post mirror grinding/polishing . Page 1 of 2Making my own fixed post mirror grinding/polishing machineposted 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 …

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optics - Spherical mirrors or parabolic mirrors? - Physics ...

The process of grinding lens or mirror surfaces produces spherical surfaces because those are the only ones that can be slid around over each other perfectly. So unless you really need it, it's easier to get by with a sphere and spherical surfaces are still the norm unless you go and specify an asphere.

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Grind and Polish a Dobsonian/Newtonian Telpe Mirror ...

They keep your mirror and tool in place as you are grinding. My mirror was bigger than my tool so I made another wedge piece that fit in there to keep the tool in place when it's on the bottom. I used some crappy plywood, I would recommend a chunk of thick plastic or nicer wood - you need to clean these a lot and all the little cracks and such ...

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Grinding Technology and Classification of Optical Lens ...

In the process of plane planetary lapping, the uniformity of lapping disc wear is closely related to the lapping quality of optical lens. Based on the analysis of the motion law of optical lens in planetary grinding process, the calculation model of workpiece trajectory and velocity under differential gear train condition is established, and the simulation program of MATLAB is …

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Optical Testing of Parabolic Mirrors : 9 Steps (with ...

A mirror mount is needed to hold the mirror during testing. If the mirror is a 'thin' mirror (i.e. the thickness is much less than 1/8th its diameter) then the mount must hold the mirror without deforming it. The weight of the glass can deform a thin mirror. In my case, I was making a full-thickness mirror, which is a mirror whose thickness is 1/8th the diameter or more, so mirror …

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Build your own telpe part 1: The mirror – Thomas ...

Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telpe (e.g. F/D = 4) well suited for deep sky observations. On the opposite, a shallow mirror (e.g. F/D = 8) will be performing very well on planets and the moon.

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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

31 The first method is by far the most popular. Grinding the curve into the mirror face …

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Mirror Grinding Machine

My Mirror Grinding Machine. For a long time I've wanted to build a machine for grinding telpe 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. …

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A Grinding Apparatus For Making A Middle-Size Parabolic ...

A large solar furnace that has a parabolic mirror with a diameter of 10m, a focal length of 3.2m and a heliostat mirror with an area of 15x15m was made by the authors at T6hoku University in 1962, and subsequently a small solar furnace having a parabolic mirror with a diameter of 1.5m, a focal -length of 0.5m and a heliostat mirror with an area of 2x2m was …

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Mirror Recoating - Orion Optics

Mirror Recoating. You will find a recoating price guide and and an A4 Printable PDF Form to return with your mirror (s) at the bottom of this page. One of the most important and very widely used services we offer is the re-coating of established or, coating of newly made mirrors. This service we offer is taken up from every corner of the globe ...