Technical Information - ZEISS
concerning grinding, lapping and polishing, the essential optical manufacturing methods. If high heat load has to be applied to the mirrors, the bulk material needs to have better heat conductivity than the materials mentioned before. In this case, metal mirrors are used if the heat load is not too high. The materials used in these applications are
US1171174A - Parabolic-mirror-grinding machine. - …
Parabolic-mirror-grinding machine. Country Status (1) Country Link; US (1) US1171174A (en) Cited By (6) * Cited by examiner, † Cited by third party; Publication number Priority date Publication date Assignee Title; US2660840A (en) * 1950 …
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.
The real origins of amateur telescope Making: amateur ...
Earlier, amateur telescopes had been the province of a few wealthy people who could afford to buy expensive small refractors. The new movement's step-by-step guides to grinding and figuring a large, high-quality parabolic mirror--and where to find clubs of other people doing the same--democratized astronomy for the 20th century.
TELESCOPE MIRROR MAKING HOW TO PART 1: Rough …
Welcome to my channel - in this video, we will begin to make a telescope mirror from scratch! I'll be showing you the basics of telescope mirror grinding!Her...
Grind and Polish a Dobsonian/Newtonian Telescope 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 ...
Techniques of Eighteenth Century Telescope Makers", Pt. I
The Royal Society possesses three long-focus simple lenses of diameters 195, 210 and 230 mm, all inscribed with the signature 'C. Huygens' and various dates in the year 1686.
Joy of Mirror Making: Rough Grinding - BBAstroDesigns
31 The first method is by far the most popular. Grinding the curve into the mirror face …
Reflecting telescope wiki | TheReaderWiki
Some telescopes 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.
Grinding Telescope Mirrors, Then and Now | Consortium for ...
The master craftsman, Roger Angel, who has been making telescope 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 …
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 …
Joy of Mirror Making: Rough Grinding - BBAstroDesigns
Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.
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 ...
Brittle materials in nano-abrasive fabrication of optical ...
Accordingly, the method is applied to the detection of large-diameter aspheric parabolic mirror online or in grinding process; the manufacturing quality …
Stellafane ATM: Materials & Tools
Topics on this page: Mirror Blanks, Grinding & Polishing Tools, Grits & Pitch, Storage Containers, Grinding Stands, and Miscellaneous Items. 6" & 8" Pyrex Mirror Blanks Patterns on surfaces and edges are mold marks, splotch on 6" is a grinding mark by the manufacturer.
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 ...
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.
Grinder Machine Mirror
20" mirror grinding log. 4/29/93 started machine fine grinding with 200 grit, 1/3W strokes, MOT (mirror on top) - 2.5 hrs, 5/l/93 continued as above, generating marks on face of mirror gone, no change in sagitta, tool contact patchy - …
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. Telescopes 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 …
Telescope Mirrors, Blanks, Secondaries, Grinding Materials ...
All the Mirrors in this range come with Ronchi, Foucault and Testing Data. 300mm (12") Glass F/5 Parabolic Mirror $1480AUD 300mm (12") Glass F/6 Parabolic Mirror $1400AUD 350mm (13.7") Glass F/5 Parabolic Mirror $1800AUD 350mm (13.7") Glass F/6 Parabolic Mirror $1700AUD 400mm (15.8") Glass F/5 Parabolic Mirror $1980AUD 450mm (17.7") Glass F/5 ...
How to Make Your Own Telescope Mirror - Instructables
This tool is called a pitch lap. It is made the same way as the penny tool you made to do the fine grinding except instead of pennies you will use "Pitch". [Fig 6] Here is a photo that shows the tool being pressed against the warmed pitch. It is resting on my mirror with aluminum foil between the tool and mirror so it doesnt stick.
Explore how telescope mirrors are made | Astronomy.com
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 …
Joy of Mirror Making: Rough Grinding | Diy telescope ...
Grinding my first 6" f/8 Telescope Mirror This video shows a few initial stages of making a primary mirror for a 6" f/8 telescope. I'm a newbie so bear with me in …
Build your own telescope 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 telescope (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.
ROUGH GRINDING THE MIRROR - Sidewalk Astronomers
ROUGH GRINDING THE MIRROR. The heart of the Newtonian telescope is the comparatively long focus, parabolic mirror called the objective. It gathers light from the object and forms an image of the object in the focal plane at the eyepiece. Most of our know-how, our effort, and our expense shall be devoted to fashioning the curve of this concave ...
Liquid Telescope Mirror - HinesLab
Not only does this technique create a surface which can save time in grinding and aluminizing a glass mirror, the focal length of this parabolic mirror is adjustable, and can be implemented at a large size. In use, gallium-indium-tin alloy, which remains liquid above -4°F, is poured into a cylindrical container, open at the top.
Zambuto Optical Company - Newtonian Telescope Mirrors
Zambuto Optical Company is a full service custom manufacturer of premium Newtonian primary telescope mirrors from 7" through 24" diameter. Special Notice-We want to let our customers know that during this timeframe we continue to do business as usual. There may be delays with regard to shipments due to outside circumstances beyond our control ...
Parabolic Mirrors Manufacturer, Off Axis Parabolic Mirror
Parabolic Mirror February 17, 2017 Hyperion Optics offer custom parabolic mirrors for use from the UV(200 to 400nm) to the IR (1to 40µm) wavebands. Parabolic mirrors are typically designed as a segment of a larger... view Zinc Selenide Lenses February 17, 2017 Zinc Selenide has great transmittance through the band 0.5-22μm, especially at 10.6μm, and is commonly used in …
Can we grind a parabolic mirror with sandpaper instead of ...
This would be fast and cheap, but a parabolic mirror suitable for a headlight or solar collector, but not for optical imaging. If the mirror is relatively slow, you can start with a flat blank piece of glass and hand grind and polish the glass, finally having it coated with aluminum.
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 …