Coal mining machine cutter with noise suppressant and flame resistant layer

In a mining machine having a power driven cutter including metallic helical blade means having cutting bit means spaced along the exterior periphery thereof, the improvement which comprises said helical blade means having fixedly secured in surface-to-surface contact therewith energy absorbing layer means for dampening vibrations set up in the metal of said helical blade means when said cutter is in power operated cutting relation so as to materially reduce the operating noise level of said cutter within the mine, said layer means being of flame resistant resilient material comprising a layer of styrene butadiene rubber material vulcanized in surface-to-surface contact with said helical blade means, said styrene butadiene rubber material having a durometer of the order of 59 and a flame spread index of less than 25 according to ASTM-E162.