Wallace W. Roepke

• Bureau of Mines coal cutting technology facilities at the Twin Cities Research Center
• Bit ignition potential with worn carbide tips
• Coal cutting forces and primary dust generation using radial gage cutters
• Computer program to relate dust generation to drum-type coal mining machines
• Drag bit cutting characteristics using sintered diamond inserts
• Effect of asymmetric wear of point attack bits on coal-cutting parameters and primary dust generation
• Effects of water on coal cutting forces and primary dust distribution
• Reduction of dust and energy during coal cutting using point-attack bits with an analysis of rotary cutting and development of a new cutting concept
• Testing modified coal-cutting bit designs for reduced energy, dust, and incendivity