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  • A model for wear of conical coal mining bits ScienceDirect

    01.10.1986· The conical bits cut coal only during one- half (or less than one-half) of the revolution of the cutter-head. For the remaining half, the bits travel through the air. In a field-trial, the cutter-head may be "laced" with equal numbers of experimental and standard bits such that both sets of bits experience identical cutting conditions.

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  • A model for wear of conical coal mining bits

    01.10.1986· Conclusions (1) For the test conditions employed in the present work, conical coal mining bits in continuous mining exhibited various stages of wear, even though all the bits had been run under identical conditions. (2) Wear mode analysis and the cumulative frequency distribution of mass loss provide a useful means of comparing bit wear. (3) A model has been developed which attempts to

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