A raise borer is a machine used in underground mining, to excavate a circular hole between two levels of a mine without the use of explosives. The raise borer is set up on the upper level of the two levels to be connected, on an evenly laid platform (typically a concrete pad).
[pdf] Drilling is a cutting process that involves the use of a drill bit to cut a circular-shape hole in a workpiece. The drill bit used in drilling is a type of rotary cutting tool that, like other rotary cutting tools, rotates while subsequently scraping material out of the workpiece. To drill a workpiece, a manufacturing company must. .
Boring is a cutting process that involves the use of a single-point cutting tool or boring head to enlarge an existing hole in a workpiece. This is. .
Finally, reaming is a cutting process that involves the use of a rotary cutting tool to create smooth interior walls in an existing hole in a workpiece. The rotary cutting tool used in reaming is.
[pdf] The name Bertha, after Seattle's first female mayor, , was chosen by a panel (that included the Governor and Transportation Secretary) from 150 submissions from kindergarten through 12th graders, who were asked to submit female names with Washington state heritage. The winning entry, which was submitted by two elementary schools in and , was selected in December 2012.
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