Schumacher, F. P. and E. Kim† (2013) Modeling the pipe umbrella roof support system in a Western US underground coal mine International Journal of Rock Mechanics and Mining Sciences 60: 114124. Kim, E.†, J. Rostami† and C. Swope (2012) Full scale linear cutting experiment to examine conical bit rotation Journal of Mining Science 48(5 ...
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Get PriceBits were worn on a highsilica sandstone typical of coal mine roofs. The bits were mounted on a 34indiam drum section that provided a bit speed of 565 ft/min. Cutting forces were measured on a modified vertical slotter using a 3axis force dynamometer and recorded on an fm magnetic tape recorder.
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Get PriceSchumacher, F. P. and E. Kim† (2013) Modeling the pipe umbrella roof support system in a Western US underground coal mine International Journal of Rock Mechanics and Mining Sciences 60: 114124. Kim, E.†, J. Rostami† and C. Swope (2012) Full scale linear cutting experiment to examine conical bit rotation Journal of Mining Science 48(5 ...
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