Stressed lap polishing

Author: xdbv

August undefined, 2024

WebDevelopment and Results for Stressed-lap Polishing of Large Telescope Mirrors1 S. C. West, R. Angel, B. Cuerden, W. Davison, J. Hagen, H. M. Martin, Dae Wook Kim, and B. Sisk OTh2B.4 Optical Fabrication and Testing (OFT) 2014 Using lap forces to predict glass removal during final polishing of large honeycomb telescope mirrors http://www.loft.optics.arizona.edu/documents/journal_articles/Martin%20Proc%20SPIE%205494.pdf

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

WebWe present an overview of the engineering design and empirical performance of four stressed-lap polishing tools developed at the University of Arizona. Descriptions of the electromechanical actuators, servo systems, computer interfacing, and attachment of the lap to the polishing machine are provided. 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. hubler obituary

Correlation-based smoothing model for optical polishing

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. 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. WebJun 22, 2014 · Figure 2: Psuedo-polar force distributions for 3 of the 18 stressed-lap benders over the GMT parent mirror to 12.6m radius. Concentric circles describe the bender force at a given lap position on the parent mirror (i.e, rotating the lap at a given point is equivalent to sampling the lap shapes about a circle centered on the parent vertex and … hubler patricia

Development and Results for Stressed-lap Polishing of Large

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

http://www.loft.optics.arizona.edu/documents/journal_articles/Jim_Burge_Fabrication_and_testing_of_large_free-form_surfaces.pdf 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 … hoher ana wertWebThe 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. hoher ana titer

"http://www.southbaytech.com/appnotes/54%20Lapping%20&%20Polishing%20Basics.pdf " - Stressed lap polishing

Stressed lap polishing

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 ... WebA stressed lap 600 mm in diameter was designed and built to polish the mirror as an f/i ellipsoid. It consists of an aluminum disk which changes shape continuously under the …

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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... http://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.

http://www.loft.optics.arizona.edu/documents/journal_articles/OFT-2014-OTh2B4_DKim.pdf 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

WebAug 2, 2024 · The stressed-lap polishing was proposed by Anderson in Steward Observatory in 1990 to realize the concept of figuring an aspheric surface similar to that of figuring a sphere by deforming the polishing lap, compared to the deformation of workpiece for the SMP (Anderson et al. 1992). Compared to a traditional sub-aperture polishing, a stiff ...

http://www.loft.optics.arizona.edu/documents/journal_articles/oe-21-23-28771_DKim.pdf hubler newcastleWebWe present an overview of the engineering design and empirical performance of four stressed-lap polishing tools developed at the University of Arizona. Descriptions of the … hubler pre ownedWebThe 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 hubler lincolnWebstressed lap places a large burden on the shape change system response for the aggressive off-axis segments. The current lap cannot be rotated faster than 3rpm … hohe rannach wandernWebMay 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 … hohe rannachWebTULLOCH. Oct 2024 - Present3 years 7 months. Sault Ste. Marie, Ontario, Canada. •Using of Autodesk Inventor and AutoCAD for creating detailed complex 3D modeling and 2D. … hubler oil change bedford indianaWebThe 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 … hoher andrang