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Stressed lap polishing

WebThe stressed-lap polishing system is designed for aspheric surfaces, and it works the same way whether the mirror is symmetric or off-axis. For a symmetric mirror, the lap has a symmetric shape when it is over the center of the mirror and distorts into the appropriate off-axis shape as the polishing motion moves it off the axis. For an WebThe stressed-lap polishing technique has been developed to meet the challenge of polishing 8-m-class mirrors with highly aspheric figures to an accuracy consistent with the best ground-based telescope sites. The method is currently being demonstrated in the …

Progress in the stressed-lap polishing of a 1.8-m f/1 …

WebJun 18, 2024 · In this paper, state-of-the-art high-precision material removal manufacturing technologies, especially ultraprecision cutting, grinding, deterministic form correction polishing, and supersmooth polishing, are reviewed and compared with insights into their principles, methodologies, and applications. WebFeb 13, 2024 · Subaperture polishing of silicon aspheric optics using air-inflated membrane tool is reported in the present work. A faster approach for material removal h ... S.C. West, R.S. Young, Progress in the stressed-lap polishing of a 1.8 m f/1 mirror, in Advanced Technology Optical Telescopes IV, ed. L.D. Barr, Proceedings of SPIE, vol 1236 (1990), pp ... indian creek family practice oxford ohio https://tanybiz.com

Manufacture of 8.4 m off-axis segm ents: a 1/5 scale …

WebThe stressed lap is a very stiff large tool with the ability to change its optical shape as it moves over the mirror surface. The lap struggles near the mirror edge and for smoothing at 5-10cm spatial scales. The lap also suffered from erratic drag variations during polishing of the first 8.4m GMT off-axis segment, and required several small ... WebLSST Polishing - YouTube Here you can see the Stressed Lap on the Large Polishing Machine, hard at work on the LSST primary in the Steward Observatory Mirror Lab. Here … WebA stressed lap 600 mm in diameter was designed and built to polish the mirror as an f/1 ellipsoid. It consists of an aluminum disk which changes shape continuously under the influence of 12 moment-generating actuators. indian creek farm

Practical design and performance of the stressed-lap …

Category:Mechanical design of the stressed-lap polishing tool

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Stressed lap polishing

Technical Reports - University of Arizona

Webstressed lap in principle removes much of the compli-cation of polishing a highly aspheric optic. In addi-tion, early polishing experiments proved that the attachment of the lap to the … WebDec 9, 2005 · A special computer controlled polishing machine and a 450mm diameter active stressed lap have been developed in NIAOT, and the lap has been successfully …

Stressed lap polishing

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WebDec 1, 1994 · The stressed-lap polishing (SLP) technology [26, 27] applies force or torque on the polishing lap during polishing the aspheric surface. The shape of the stressed lap is … WebJun 23, 2024 · The SPBP method is a sub-aperture finishing process, in which the polishing spindle swings around the normal direction of the target surface within the scope of swing angle while moving around the center of the bonnet. This is quite different from the “tilted” and “precession” polishing regime, in which the precession angle is constant.

WebStress lap polishing • Large tool can be used if it fits the surface • University of Arizona stressed lap is actively deformed so that it always fits the surface. • Used for > 200 m^2 of axisymmetric aspheres • Software change to allow operation on freeform aspheres Grinding GMT Polishing NST Performance of stressed lap WebThe stressed lap [2] consists of a stiff aluminum plate that is bent actively by actuators mounted at its edge. The polishing interface may be pitch or polyurethane pads. The bending actuators control the shape of the polishing surface to match the local surface of the aspheric mirror.

WebJun 22, 2014 · The University of Arizona Mirror Laboratory polishing program relies on the stressed-lap tool. Its implementation is discussed for recent mirrors including the off-axis … WebUPDATE: We no longer use, or recommend the hacksaw blade scoring technique. Experimentation has proven it generally more harsh than useful. We now use and re...

WebMay 11, 2024 · The stressed-lap polishing (SLP) technology [26, 27] applies force or torque on the polishing lap during polishing the aspheric surface. The shape of the stressed lap …

WebJan 19, 2024 · Based on the time-dependent model, we proposed a strategy to improve the RC-lap smoothing efficiency, which incorporated the theoretical model, tool optimization, and efficiency limit determination. Two sets of smoothing experiments were performed to demonstrate the smoothing efficiency achieved using the time-dependent smoothing … local government of tennant creekhttp://www.loft.optics.arizona.edu/documents/journal_articles/OFT-2014-OTh2B4_DKim.pdf#:~:text=The%20stressed-lap%20polishing%20tool%20%5B1-4%5D%20creates%20a%20very,is%20rotated%20and%20translated%20over%20the%20mirror%20surface. indian creek farm bulverde tx for saleWebOct 26, 2024 · To overcome the low efficiency of the conventional fabrication process, we proposed a new processing chain, combining the CNC generating, stressed lap grinding/polishing, and CCOS and MRF... local government of ghanahttp://www.loft.optics.arizona.edu/documents/journal_articles/oe-21-23-28771_DKim.pdf local government of giri abujaWebLarge aspheric mirrors are ground and polished at the Steward Observatory Mirror Lab (SOML) using stressed-lap polishers under computer control. 1 Stressed-lap polishing uses large stiff circular polishing tools, which are actively deformed under computer control so the lap continually fits the aspheric mirror surface. 2,3 The size of the tool is … local government of manila careersindian creek farm - ithacaWebStressed lap consists of two parts: active deformable lap, driving-adjusting mechanism. The finite element model for active deformable lap is constructed, and the performance of lap … local government nsw 2022 conference