a. A miner's pick. Webster 3rd
b. A usually tapered or cylindrical axle spindle, or arbor that is
inserted into a hole in a piece of work so as to support the work during
machining. Webster 3rd
c. A metal bar that serves as a core around which metal or other material
may be cast, molded, forged, bent, or otherwise shaped.
d. Any of a train of jointed units intended to be pulled through an
underground duct as each joint is made to ensure perfect alinement, or
through a steel pipe in process of welding to ensure a smooth interior.
e. The shaft and bearings on which a tool (as a grinding disk or circular
saw) is mounted. Webster 3rd
f. A temporary interior support for a thin-walled tube (as a tubular steel
pile to be filled later with concrete) being driven into something.
Dictionary of Mining, Mineral, and Related Terms