25 October 2011 Dragging force and astigmatic surface in commercial polishing machines
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Abstract
It is well known that astigmatic surfaces are obtained when surfaces are polished in commercial polishing machines, which are designed to produce surfaces of revolution. The authors of this paper do not know an explanation for this result. In order to understand why the wear is a function of the angular position on the glass, we measured the dragging force applied from a rotating glass to a small fixed tool of Teflon®. These experiments were done for several tool radial positions by using a table travel X-Y. With the aid of a force sensor dragging force as a function of the time was measured. We found that dragging force is a periodic function with fundamental frequency equal to the angular velocity of the glass, indicating that there is more wear on one glass angular position than another. We also found that this result is independent of the radial position of the tool. We used a polisher concentration of 20 degrees Baumé which is recommended by the supplier. And the amount of polisher per time and area units, dragged by the tool, remained constant for each one of the radial positions of the tool.
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Gildardo Pablo Lemus-Alonso, Gildardo Pablo Lemus-Alonso, Alberto Cordero-Dávila, Alberto Cordero-Dávila, Rafael Izazaga-Pérez, Rafael Izazaga-Pérez, } "Dragging force and astigmatic surface in commercial polishing machines", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 801126 (25 October 2011); doi: 10.1117/12.903405; https://doi.org/10.1117/12.903405
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