| 摘要 |
Described herein is a wear indicator (100) for use in a drill bit or a core head. The wear indicator (100) comprises an elongate element that forms part of the drill bit. The elongate element has a plurality of numbers (110, 120, 130, 140, 150, 160, 170, 180) formed along its length, each number (110, 120, 130, 140, 150, 160, 170, 180) being formed as a void and corresponds to a level of wear in accordance with the IADC dull grading system. As the drill becomes worn, the wear indicator (100) wears at the same rate to reveal one of the numbers (110, 120, 130, 140, 150, 160, 170, 180). The numbers range from “1” to “8” where the number “1” illustrates the least wear and the number “8” indicates the most wear. When unworn, none of the numbers are visible. |
| 主权项 |
1. A wear indicator for drilling bits, the wear indicator comprising an elongate element having a plurality of regions formed along a length of the elongate element, each region having a number, formed as a void within the region that is indicative of the level of wear, and each region being formed as a discrete portion, the discrete portions held together to form the elongate element. |
