| 摘要 |
A drilling-depth indicator has laser pointing module (1) mounted by a pivot point on the body of a hand drilling machine (2) such that its emitted light-beam (3) is axially aligned to project a moveable visible reference mark on the surface of the drilling- tool (4) at a pre-set position (5). The laser pointing module is powered by the battery (7) via the on-off switch (6). If the distance between the projected light-mark (5) and the drill-tip (8) is set to be equivalent to the depth of the hole required (9), a visual indication that the pre-set hole depth is achieved when the projected light-mark on the drilling-tool coincides with the surface of the drilled work-piece (10).
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