| 摘要 |
The invention contemplates a miniature drill which is hand-held at a quill or sleeve on the drill axis, in the manner of a pencil or pen. The tool includes mass eccentric to the drill axis for absorbing reaction torque occasioned by drill operation. In one employment, the fingers of the hand which holds the sleeve also steady the drill against the workpiece, and in another employment a work-supporting jig fastened to the sleeve converts the tool into a portable miniature drill press, assuring accurate tool alignment upon entering and through a drill-feeding stroke into the work.
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