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Grinding Porous Material

IP.com Disclosure Number: IPCOM000077997D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Oakes, RV: AUTHOR

Abstract

This grinding method is useful in grinding porous metal or ceramic material to accurately form a smooth, porous, air-bearing surface of the type used to support magnetic tape on an underlying cushion of air.

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Grinding Porous Material

This grinding method is useful in grinding porous metal or ceramic material to accurately form a smooth, porous, air-bearing surface of the type used to support magnetic tape on an underlying cushion of air.

As a first step in this method, the part to be formed into an air-bearing is prepared, as by rough grinding or machining, so that approximately 0.015 inch remains to be removed to achieve the desired air-bearing dimension. The next
0.011 inch of material is removed, first by a plunge grinding step, followed by a traverse grinding step. Both steps use a soft, large grit, aluminum oxide grinding wheel. This type wheel freely loads the removed material into the wheel, rather than packing it into the porous part and destroying its porosity. The grinding wheel should be dressed at least twice during plunge and traverse grinding.

During plunge grinding the Dart rotates on a stationary axis.

The part's surface moves at a speed of 1800 inches per minute. The wheel moves into the part at an infeed rate of 0.001 inch per minute.

The wheel's surface speed is 7000 inches per minute. The total material removed during plunge grinding is 0.009 inch.

During traverse grinding the part continues to rotate at the same speed and its axis is moved in oscillatory fashion at a speed of four inches per minute. The wheel continues to rotate at the same speed on a stationary axis. The remaining
0.002 inch of material is removed at a rate of 0.0001 inch for eac...