| 摘要 |
Methods and apparatus for locating and drilling pilot holes. Known systems are time-consuming and difficult to carry out and do not reliably result in straight and accurate pilot holes. The invention provides easy and accurate location and drilling and accurate alignment with an initial hole on an inaccessible surface. Clamp jaws (22, 50) are spring loaded into a closed position. Pliers (82) engage jaw (50) and head (64) of a shaft (60) extending through jaw (50) and attached to jaw (22). Pliers (82) are squeezed to move jaw (50) along shaft (60) away from jaw (22). Clamp (22, 50) is placed around a workpiece (10, 8, 15) with a pilot (38) carried by jaw (22) engaging a back surface pilot hole (16). Pliers (82) are released to allow spring (66) on shaft (60) to clamp jaws (22, 50) around workpiece (10, 8, 15). Drill bit (90) is introduced into a bushing (54) in jaw (50). Drilling is commenced, pilot (38) is retracted into slot (26) in jaw (22), and drilling all the way through workpiece (10, 8, 15) is completed.
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