A professional who tends bit-sharpening machine to shape and sharpen detachable bits of mining equipment. Respnsibilities include:

• Inserts bits into clamps of power-driven revolving drum and fastens them in place, using wrench.
• Turns handwheel to move bit against grinding wheels and to turn bit to sharpen cutting and reduce it to gauge size.
• Lubricates sharpening machine and changes worn grinding wheels, using handtools.