| 摘要 |
<p>A drill bit (110) can include a body (120) defining an axis (135) and first and second cylindrical portions (155), a coupling (125) adapted for connection with a rotary driver (118), and, a depth stop (130) adjustably secured to a first portion (150) by a plurality of adjusting fasteners (160) in a manner to limit penetration of the bit (110) into a target surface. A method of drilling a hole (205) into the surface (115, 210) can include locating a drilling machine (105) fitted with a drill bit (110) over a target location, compensating for wear on the bit (110) by setting a depth stop (130) to limit travel of the bit (110) at the predetermined depth, drilling at the target location until the depth stop (130) contacts a surface, where the primary cutting surface (170, 175) forms a portion of the hole (205) defined by a first diameter (D4) and the secondary cutting surface (180) forms a portion of the hole (205) defined by a second diameter (D5) in a single step, and removing the drill bit (110) from the hole (205).</p> |
