| 摘要 |
The clamp 20 includes clamp arms 24, 26 with the first clamp arm including a bore 28 through which a cutting tool of a drill may move. The second clamp arm includes a cavity 34 into which the cutting tool of the drill may move. The longitudinal axis of the bore 28 and the cavity 34 are aligned. If an object is clamped and the cutting tool is moved through the bore 28 to contact the object, a portion of the object that is in contact with the first clamp arm 24 surrounds the point on the object contacted by the cutting tool. If an object is clamped and the cutting tool is moved through the bore 28, through the object, and into the cavity 34, a portion of the object that is in contact with the second clamp arm 26 surrounds a point on the surface of the object at which the cutting tool exits the object and enters the cavity 34. The first clamp arm 24 may include a threaded bore to receive a removable drill bush (8, Figure 3).
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