Click Image to Enlarge Although deep hole drilling machines such as this B630 from Unisig are designed for the special needs of creating holes through long workpieces, they have the flexibility to perform a variety of operations such as boring, counterboring, trepanning, roller burnishing and pull boring. The machine shown here is the 10-meter version. Pull boring is a precision operation in which a cutter is pulled through an existing hole to improve straightness
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