Study on magnetic field-assisted polishing (2nd Report) - effect of magnetic field distribution on removal distribution

components and an estimation of the sphericity error. Two methods for processing offset components are put forward. The 'meridian method' is applied to measure the sphere contour; the 'sequence elimination offset method' is applied in order to recognize and eliminate the horizontal offset component. The restraint methods for other offset components are also discussed. An optimum method for the evaluation of the position of the sphere center and sphere error is presented. 51. Farnum, G. Staying competitive with tighter control (Precision Machining). Managing Automation. 1993 Oct; Precision Machining, which is known in the industry as Pre Mac, has traditionally invested heavily in advanced production equipment. Its 90,000-sq.-ft. shop floor exhibits an array of computer-numerical-control (CNC) machining centers, turning centers, profilers, and grinders. As the 1990s dawned, however, Pre Mac became convinced that equipment alone was no longer enough. The new business conditions called for both efficient production technology and tighter control of manufacturing process. Pre Mac identified a number of areas for improvement, including scheduling, inventory management, and cost tracking and control. Late in 1990, Pre Mac began implementing ProfitKey's Rapid Response Manufacturing (RRM) system, a manufacturing control system for companies in the discrete industries, particularly those that operate in a job shop or make-to-order environment. The system includes manufacturing resource planning (MRP II), computer-aided machining (CAM), database management, bar-code data collection, electronic data interchange (EDI) and other modules, including a proprietary finite scheduler. 52. Kim, Jeong-Du; Choi, Min-Seog. Stochastic approach to experimental analysis of cylindrical lapping process. Wear. 1993 Nov 15; 170(1): 131-136. Lapping is a very complicated and random process resulting from the variation in size and shape of abrasive grains and from the numerous factors which affect the process quality. Thus it needs to be analyzed by experiment rather than by a theoretical method, to obtain the relative effects of factors quantitatively. In this study, a cylindrical lapping experiment designed using Taguchi's L8 orthogonal array was performed and analysed using Yates' ANOVA table. As a result, effective factors and interaction effects were identified and discussed. Also the optimal factor combination to obtain the largest per cent improvement in surface roughness was selected and confirmatory experiments were performed. 13 Refs. 53. Tu, Jay F.; Stein, Jeffrey L. Strain wave estimation and sensing for monitoring machine tool spindle dynamics. Proceedings of the 1993 ASME Winter Annual Meeting - Symposium on Mechatronics, Dynamic Systems and Control Division. New York, NY: American Society of Mechanical Engineers; 1993: 277-283. Vol. DSC 50. The distributions of strain waves produced in the spindle bearing and housing during operation are estimated using classical solutions from elasticity. These strain waves are of considerable practical significance because their close correlation to spindle bearing preload, cutting forces, and bearing running conditions. Based on this analysis, optimal sensor size, location, and design are discussed. The results are satisfactory compared with the Promess sensor, which attaches strain gages in a groove customarily ground around the outer ring. The analysis indicates that a new spindle monitor can be designed by using sensors with sufficient sensitivity, attached on the spindle housing surface. The performance of this spindle monitor may be comparable to that of the Promess sensor but with less wiring and mounting difficulties. The idea of using high sensitivity sensors and attaching them at 'remote' but easily accessible areas for monitoring purposes can also be expanded to many other applications, such as gear box monitoring. 6 Refs. 54. Suzuki, Hirofumi; Hara, Shigekazu; Matsunaga, Hiroyuki. Study on aspherical surface polishing using a small rotating tool. Development of polishing system. Journal of the Japan Society for Precision Engineering. 1993 Oct; 59(10): 1713-1718. In order to generate an aspherical surface most precisely, computer controlled polishing using a small rotating polisher is one of the most suitable methods. In this study, a new type of polishing head was developed and its aspherical surface polishing properties were tested. The characteristics of this polishing head are as follows: (1) A soft spherical polyurethane polisher was used as the polishing tool, and its rotating axis was controlled to be always at 45 ° from the tangent line of the machining point on the workpiece surface. Therefore the profile of the polishing trace was more uniform and was suitable for precisely generating the required aspherical surface. (2) The polishing load was applied from the normal direction of the machining point and was controlled to be constant. In tests, spherical BK7 glass was polished to an aspherical shape. A form accuracy of 0.1 I~m P-V ( + 0.05 pm) and surface roughness of < 0.01 I~m Rmax were obtained. 55. Suzuki, Hirofumi; Kodera, Sunao; Matsunaga, Hiroyuki; Kurobe, Toshiji. Study on magnetic field-assisted polishing (2rid Report) - effect of magnetic field distribution on removal distribution. Journal of the Japan Society for Precision Engineering. 1993 Nov; 59(11): 1833-1838. This paper describes the effect of the magnetic field distribution on the removal distribution of the workpiece surface in the magnetic field-assisted polishing method. In case of applying this method to the curved (aspheric) surface polishing, the next process is suitable. The designed shapes are first generated precisely by turning or grinding, and then the surfaces are finished only to improve the smoothness, with the previous form accuracy being maintained. Therefore, in order to carry out the uniform removal polishing using the magnetic field-assisted polishing, it is important to clarify the processing mechanism of this polishing method. In this report the relation between the distribution of magnetic field and the polishing pressure distribution was analyzed theoretically and experimentally using several shapes of magnetic poles in the polishing set-up. And, by polishing examination of the flat glass, the relations between the magnetic field distribution, polishing pressure distribution and polishing removal distribution were analyzed experimentally. As a result, the relations between the magnetic field distribution, polishing pressure distribution and polishing removal distribution were clarified. 7 Refs. 56. Moriwaki, Toshimich; Okuda, Koichi; Shen, Jian Guo. Study on ultrapreclsion orthogonal micro-diamond cutting of single-crystal copper. JSME International Journal, Series C: Dynamics, Control, Robotics, Design and Manufacturing. 1993 Sep; 36(3): 400-406. The results of experimental study of ultraprecision orthogonal micro-diamond PRECISION ENGINEERING

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