mirror grinding optics

Fixed abrasive grinding of CVD SiC mirrors - sites.bu.edu

A strategy for machining ceramic (silicon carbide) mirrors is described. By taking advantage of the relative ductility of ceramics compared with that of glass, it is shown that fixed-abrasive, ultraprecision grinding is a viable ... Keywords: ceramic machining; ductile-regime grinding; optical fabrication; ultraprecision grinding Introduction ...

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r/Optics - Grinding of the Hubble Space Telescope mirror at the Perkin ...

Since we are in r/optics, worth noting that the reflective null corrector was necessitated by the extremely smooth surface quality requirements since Hubble works down into the UV, which the uh "prior customers" needing 2.4m mirrors were not requiring. The risk of the novel reflective null corrector was known to the team, but somewhere along ...

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Telescope Making Links - Supplies and Components

Wood Apply Ply Plywood - Local distributor is Northern Jersey Reserve Supply, 2 Midland Ave., Elmwood Park, NJ 07407 Tel (201)796-3000 Birch and Maple Plywood Columbia Forest Products - Europly and JayCore Plywood - Local Distributor is North Pacific Group, 174 Northfield Avenue, Edison, NJ 08837, Tel 800-257-8310 BB Grade Baltic Birch Plywood

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Fast Mirror Grinding & Polishing - The ATMs Workshop

Figure 1: Polishing pads applied to a 9 inch grinding tool. Another local ATM has also tried the polishing pads with abrasive and CeO. His own 17.5" mirror took about nine hours to polish out completely. He experienced some minor zoning with the pads, but these polished out after switching to pitch.

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diagonal - Astrosurf

First, single flat (with optical side clearly marked!) as well as pieces of window plate glass (6 mm thick and slightly larger) were slowly wormed up in an oven. Then bee wax was melted on optical surface as well as on one of the other pieces and all three were sandwiched together.

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Grinding & Polishing Powders - Polishing pitch - Galvoptics

Grinding powders polishing pitch cerium oxide for telescope mirror grinding and polishing. View Basket (0) £0.00 ex VAT View Quote (0) Register Login. Telephone: +44 (0) 1268 728077 | Fax: +44 (0) 1268 590445. Email: sales@ ... Optical Cerium Oxide Polish. We supply high quality Cerium Oxide 1.0 micron polishing powders - available in sizes ...

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LOFT, Large Optics Fabrication and Testing group with OEFF & RFCML ...

Optical Engineering and Fabrication Facility / Richard F. Caris Mirror Lab. ... We have built three robotic grinding and polishing machines, capable of manufacturing on-axis and off-axis aspheres, concave or convex up to 1.8-meters in diameter. ... The Mirror Lab's ability to supply them makes it possible for the university to be a partner in ...

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Brittle-ductile transition in shape adaptive grinding (SAG) of SiC ...

The basic principle of SAG can be described as "semi-elasticity": using an elastic spherical tool, overall compliance is achieved with freeform workpieces over a sub-aperture grinding area, while hard contact is simultaneously achieved at relatively smaller scale thanks to rigid pellets covering the elastic tool.

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Diy mirror grinding aspherical : telescopes - reddit

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. Look up the Foucault Knife test and or Ronchi test.

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Silver Optics Co.,LTD Professional Polymer Optical Lens Manufacturer in ...

Optical Design, Optical Grinding,Precision Optical Mold Making, Optical Injection Molding, and Optical Coating. Our Product Lines: Aspheric condenser lenses, fire polish aspheric lenses, optical filters glass, achromatic lenses, large optical lenses, front surface mirrors, prisms, cylindrical lense.

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Mirror Substrates - Made in Poland by Solaris Optics

Typical mirror substrate materials: B270, N-BK7, Zerodur, Pyrex,Fused Silica, Borofloat, Silicon, etc. Mirror substrates are usually one-side polished and one-side plane and matt. Mirrors and mirror substrates manufactured in our facilities can reach nanometric Surface Form Accuracy and subnano-roughness.

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Custom Optics | Photonics Buyers' Guide | Photonics Marketplace

Advanced Optics manufactures custom optics, precision optics, as well as off-the-shelf optical mirrors, windows and optical flats from prototype to production. We carry a wide range of substrates in-house, precision polish up to lambda/20 and provide custom fabrication and coatings. • Established in 1966.

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MAKE YOUR OWN TELESCOPE KITS - Sharp Vision Telescopes

The standard kit includes all the finished optical components needed to build a Newtonian reflecting telescope; namely, the primary concave mirror, the secondary flat mirror, two eyepieces of 25mm and 12.5mm focal lengths, one Barlow lens that increase the power of any of the eyepieces from 1.5x to 4x times, a 25mm diameter objective lens and ...

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A Method of Restraining the Adverse Effects of Grinding Marks on Small ...

The grinding method is used as the preliminary processing procedure for small aperture aspheric mirrors. Regular grinding marks produced in the grinding process significantly affect the mid-spatial frequency error; however, because of their small radius of surface curvatures and high steepness, they are difficult to polish using traditional methods. Therefore, in this study, the ultra ...

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Mirror grinding method and glass lens - Olympus Optical Co., Ltd.

A mirror surface grinding method processes an optical glass material into a lens shape using a cup-shaped grinding stone. The grinding stone is pupplied with a polishing solution which contains charged fine particles, thereby electrically attaching the charged fine particles to the grinding stone.

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Optic Wave Laboratories - Optical Coatings

Coatings. Optic Wave Labs offers the services of its in-house coating facility to the public. We provide standard aluminum, semi-enhanced aluminum, enhanced aluminum, gold and silver coatings. Our automated deposition system can accommodate telescope mirrors up to 22 inches in diameter. We coat new mirrors as well as re-coat your existing mirror.

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Art-Optics - University of Arizona

Historians tell us that artisans were grinding glass spectacles by the 14th century, so they certainly had abrasive compounds at that time. It turns out that if you rub two bars of metal (or pieces of glass) across each other with grinding paste in between, one surface naturally ends up convex, and the other concave.

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News - wp.optics.arizona.edu

The TAO primary mirror has just begun the grinding phase through the use of our 6.5 meter Swing Arm CCP (Computer Controlled Polisher). ... The DKIST primary mirror sees its first grinding run with the Optical Engineering Fabrication Facility (OEFF) first 12 Axis Computer Controlled Polisher (CCP) featuring two polishing heads: a passive lap ...

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Dick Parker's Telescope Mirror Workshop: Cassegrain Telescope Project

This test uses a perforated optical flat near the light source. The light source is at the mirrors focus (rather than the center of curvature) and the light passes through the perforation in the optical flat to the mirror being tested. The light then reflects back in a collimated beam the diameter of the mirror being tested.

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Blanchard Grinding vs. Precision Grinding | Summit Steel ...

Cylindrical grinding: Cylindrical grinding provides a smooth surface finish on round objects. Read More: Supplier Diversity. In a typical precision grinding process, a wheel grinds the surface down to the exact specifications of the project, all while using the utmost precision. In addition to this shaping and shaving, however, this grinding ...

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Stellafane ATM Main Page

Amateur Telescope Making Main Page. Russell Porter. 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 ...

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Mirror Recoating - Orion Optics

If you are able to remove all attached parts and any residual glues, paints, resins etc, we can then immerse the mirror in the 'stripping solution'. If you are unable to remove these 'attachments' and adhesives etc, we can do it for you.

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TELESCOPE MIRROR BLANKS - Advanced Glass

Our blanks have the following standard characteristics: Precision annealed material (6 Mu or less guaranteed) Edges diamond ground with a 220 grit finish Dimensional tolerances +/-.010" Main face diamond ground flat to .033" with a 120 grit finish Curves diamond generated to +/-1% of radius with 120 grit All edges chamfered

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telescope - Why aren't secondary mirrors offset to get rid of ...

I'm not sure if they did over 4 times the primary mirror grinding just to use an off-axis circle-ellipse that's less than a quarter the area of the mirror. That sounds like a lot of work and waste to get rid of diffraction spikes. Imagine grinding a mirror about a yard wide just to make a 12-16" telescope.

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Nano-precision combined process of electrolytic in ... - ScienceDirect

Nano-precision combined process of electrolytic in-process dressing grinding and magnetic assisted polishing on optics glass material Tae-Soo KWAK, Yong-Chul LEE, Gyung-Nyun KIM, Dae-Bong CHOI, Mikio YAMANOI, Hitoshi OHMORI Department of Mechanical Engineering, Jinju National University, Jinju, Korea Received 2 March 2009; accepted 30 May 2009 Abstract: This study is focused on the application ...

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Application of ELID grinding technique to precision machining of optics

ELID (Electrolytic In-process Dressing) grinding is a new ultra-precision machining technique which employs in-process electrolysis to dress the metal bond diamond wheel in grinding process.

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Star Testing a Telescope - BBAstroDesigns

The fitness of any optical test is determined by its usefulness to the process. Different optical tests are needed at different times in the mirror making process: grinding, polishing, parabolizing and final evaluation. The star test under the stars is best used for finishing parabolization and for final evaluation.

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News - Spherical mirror grinding and chamfering

This method is first grinding edge, then grinding wheel relative to the lens left and right axial movement of a small distance grinding lens angle. This method requires the diameter of the joint D' should be smaller than the diameter of the lens D, the relationship is, D' = D- (0.5 + 2δ).

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Polishing and Grinding by Manasota Optics in Sarasota, FL

Manasota Optic's Polishing/Grinding Department can produce "plano" or flat optics as well as spherical components. The sizes of components can range up to 24" in diameter and the optical requirements are typically 1/8 wave or better PV and 20-40 angstroms RMS for surface roughness. The planetary polisher has a lap surface which accommodates ...

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Mirror Designs, Reflection Mirror, Optical Mirror|Mirrors Optics

Spherical Reflection Mirrors, Off-Axis Parabolic Mirrors, Plano Mirrors With High Reflection Coating. Optical Mirrors are designed to reflect light for a variety of applications, including beam steering, interferometry, imaging, or illumination. Optical Mirrors are used in a wide range of industries, such as life sciences, astronomy, metrology ...

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M2 and M3 Mirrors | ELT | ESO - European Southern Observatory

The M2 mirror is a convex 4.25-metre F/1.1 thin meniscus, about 100 mm thick, with an 800-mm central hole. Its optical surface shape is very aspheric, with a departure from a sphere that is close to 2 mm. The size, convexity, aperture ratio and asphericity make this mirror extremely difficult to polish and test.

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Ronchi Matching Test - BBAstroDesigns

For a review, see Malacara's, 'Optical Shop Testing', second edition, chapter 9, 'Ronchi Test'. I use the test geometrically which measures the transverse aberration (the Foucault test measures longitudinal aberration). ... Dennis Rech's comments, inventor of the Mirror-O-Matic mirror grinding machine

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grinding an optical flat mirror - Reiner Vogel

After fine grinding, one of the blanks is picked as the future flat mirror and will be polished. My blanks were 150 mm borofloat blanks with 15 mm thickness from Schott, Germany. The back of the blanks should be roughened as well to prevent reflections during optical testing later on.

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Optics Products | Coherent Corp. - II-VI

By II-VI / February 10, 2021. II‐VI Incorporated (Nasdaq: IIVI), a leading provider of imaging optics, today announced the introduction of its diffraction-limited apochromatic objective lenses for fluorescence imaging. The rapidly growing number of life sciences instruments, including fluorescence-based imaging systems, flow cytometers, and ...

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Optical Mirrors | Custom Optical Mirrors - UQG Optics

All our Optical Mirrors can be supplied from a standard range stock for a broad range of applications. We also supply custom optical mirrors made to your specific design, diameter, curvature, thickness, surface quality and focal length specifications. Mirrors Colour Separating Mirrors Available as Stock and Custom Concave Mirrors

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Using RMS wavefront error to evaluate optical quality | OFH

However, there are different metrics to evaluate what is a "good image". Most of the time, a customer won't express their image quality requirements in terms such as MTF or ray aberration plots. However, they know what they want the optical system to do. It is up to the optical engineer to translate those needs into a numerical specification.

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Optic Wave Laboratories - Optical Coatings

Coatings Optic Wave Labs offers the services of its in-house coating facility to the public. We provide standard aluminum, semi-enhanced aluminum, enhanced aluminum, gold and silver coatings. Our automated deposition system can accommodate telescope mirrors up to 22 inches in diameter. We coat new mirrors as well as re-coat your existing mirror.

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A Process for Producing High-Quality Lightweight Mirrors | T2 Portal - NASA

Each mirror is a monolithic structure consisting of a face sheet with a highly polished front optical surface. In Goddards process for making these mirrors, the optical surface is formed in a solid SCS blank either by conventional grinding and polishing or by diamond turning. The blank is then lightweighted using Computer Numerical Control (CNC ...

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CNC Glass Machining | Edmund Optics

Stabilized mirror substrates made from ZERODUR ® and other advanced materials, CNC Glass Machining at Edmund Optics ®, Edmund Optics ® (EO) employs a wide range of CNC glass machining equipment to machine complex optical component geometries including ultrasonic machining and high speed cutting (HSC) technology from DMG MORI ®.

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Flat Mirrors - Flat Mirror - Flat Optical Mirrors | Edmund Optics

Published Articles. Flat Mirrors are Optical Mirrors designed for a variety of applications, including beam steering or folding, interferometry, or as optical components within imaging systems. Additionally, Flat Mirrors are ideal for lab or OEM integration. Surface flatness is a measurement of the roughness of the surface.

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