Deep Down in Coal Mine, Torque Multipliers are Selected for Maintenance Applications Deep down in a coal mine, the foreman faced lengthy and costly dilemmas for two key maintenance applications. The first maintenance application was for removing and re-tightening the bolts during the servicing process for "Mining Heads" used on the industrial machines attached to the vehicles underground. The "Mining Heads" are used to channel through rock and extract the coal from the underground mine. Being the deepest coal mine in the US, 5 miles deep, bringing these Mining Heads out of the mine each time for service was not economical and would create too much down time. It would take 4 days to bring the Mining Heads to the surface. The other key maintenance application challenge for the foreman was se

Join for free to read