| 摘要 |
A base which is easily clamped or bolted to work being drilled, attached to the base a support column with its longitudinal axis perpendicular the work surface, a body that can be adjusted and fixed anywhere along the support column, and a thrust bearin g spindle assembly offset and parallel to support column that is threadedy engaged wit h body. The thrust bearing is rotated by hand thereby providing a force urging the spind le towards the work, the spindle that turns independently of thrust bearing, is easily engaged by variety of hand and power tools on one end and has a drill chuck on the opposite end .
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