&lt;title&gt;Computer-controlled polishing of moderate-sized general aspherics for instrumentation&lt;/title&gt;

Walker, David D.; Kim, Sug-Whan; Bingham, R. G.; Kim, Do-Hyung; Thirtle, J. H.

doi:10.1117/12.316754

Cited by 8 publications

(4 citation statements)

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“…However, over the last few decades, a number of new optical fabrication techniques have been developed and they bring some degree of controllability to the large optics fabrication process. Examples include, but are not limited to, computer controlled optical surfacing from ITEK [1,2], stressed-lap polishing from University of Arizona [3], active lap polishing from University College London [4], the ion figuring method from Kodak [5], magnetorheological finishing (MRF) from QED [6], and the intelligent robotic polisher (IRP) from Zeeko [7,8].…”

Section: Introductionmentioning

confidence: 99%

Novel orthogonal velocity polishing tool and its material removal characteristics from CVD SiC mirror surfaces

et al. 2016

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A new and patented polishing tool called Orthogonal Velocity field Tool (OVT) was built and its material removal characteristics from Chemical Vapor Deposition Silicon Carbide (CVD SiC) mirror surfaces were investigated in this study. The velocity field of OVT is produced by rotating the bicycle type tool in the two orthogonal axes, and this concept is capable of producing a material removal foot print of pseudo Gaussian shapes. First for the OVT characterization, we derived a theoretical material removal model using distributions of pressure exerted onto the workpiece surface, relative speed between the tool and workpiece surface, and dwell time inside the tool- workpiece contact area. Second, using two flat CVD SiC mirrors that are 150 mm in diameter, we ran material removal experiments over machine run parameter ranging from 12.901 to 25.867 psi in pressure, from 0.086 m/sec to 0.147 m/sec tool in the relative speed, and 5 to 15 sec in dwell time. Material removal coefficients are obtained by using the in-house developed data analysis program. The resulting material removal coefficient varies from 3.35 to 9.46 um/psi hour m/sec with a mean value of 5.90 ± 1.26(standard deviation). We describe the technical details of the new OVT machine, the data analysis program, the experiments, and the results together with the implications to the future development of the machine.

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Section: Introductionmentioning

confidence: 99%

Novel orthogonal velocity polishing tool and its material removal characteristics from CVD SiC mirror surfaces

et al. 2016

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“…The biggest of these is a 7-axis CNC machine equipped with a device that polishes parts from small to large sizes with an abrasive suspended in a fluid. Previous research supports these systems with applications featuring large optic components [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness Evolution Model for Finishing Using an Abrasive Tool on a Robot

Fernández

Antonio

Javierre

et al. 2015

International Journal of Advanced Robotic Systems

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The polishing process is the final step in the manufacturing workflow for many parts and tools. While previous tasks have evolved technically, the finishing of freeform surfaces is still effected mostly by hand. Many parts are rejected because no control of the process is possible. The main problems are geometrical shape deviations and no repeatability of the process. A new methodology has been developed for the passes of the abrasive on the polished part. This research focusses on the feasibility of robotic polishing and the development of a new evolution model pertaining to the surface roughness for an abrasive tool mounted on a spherical robot. The polishing principle is mechanic and based on dry friction. The tool is multilayered with a compressive foamed core. The combination of rotational and translational movement requires the creation of a model that can predict the footprint on the polished surface. The mathematical model developed for the evolution model permits for making a prediction of the final surface quality in the function of the programmed polishing parameters. Furthermore, the model described allows for setting up polishing parameters in order to reach a desired final roughness with less than 15% deviation. Repeatability is assured and polishing time is reduced down to 1/5 of manually effected procedures.

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“…Many modern optical systems depend on high-precision aspherical components. [1][2][3][4] However, traditional polishing techniques often fail in the production of such complex surfaces. [5][6][7][8][9][10] Therefore, new production methods have been developed to satisfy these demands.…”

Section: Introductionmentioning

confidence: 99%

Advanced techniques for computer-controlled polishing

et al. 2008

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Computer-controlled polishing has introduced determinism into the finishing of high-quality surfaces, for example those used as optical interfaces. Computer-controlled polishing may overcome many of the disadvantages of traditional polishing techniques. The polishing procedure is computed in terms of the surface error-profile and the material removal characteristic of the polishing tool, the influence function. Determinism and predictability not only enable more economical manufacture but also facilitate considerably increased processing accuracy. However, there are several disadvantages that serve to limit the capabilities of computer-controlled polishing, many of these are considered to be issues associated with determination of the influence function. Magnetorheological finishing has been investigated and various new techniques and approaches that dramatically enhance the potential as well as the economics of computer-controlled polishing have been developed and verified experimentally. Recent developments and advancements in computer-controlled polishing are discussed. The generic results of this research may be used in a wide variety of alternative applications in which controlled material removal is employed to achieve a desired surface specification, ranging from surface treatment processes in technical disciplines, to manipulation of biological surface textures in medical technologies.

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<title>Computer-controlled polishing of moderate-sized general aspherics for instrumentation</title>

Cited by 8 publications

References 0 publications

Novel orthogonal velocity polishing tool and its material removal characteristics from CVD SiC mirror surfaces

Novel orthogonal velocity polishing tool and its material removal characteristics from CVD SiC mirror surfaces

Surface Roughness Evolution Model for Finishing Using an Abrasive Tool on a Robot

Advanced techniques for computer-controlled polishing

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