钻头规是种周长一定的环型物，它卡紧在钻头的周围，去检测和测量钻头是否磨损，即在钻井过程中是否减少了周长。
Bit gauges, rings of defined circumference, are slipped around drill bits to detect and measure wear, which reduces the circumference of the bit during drilling.
在止规塞规上转动螺纹主要取决于更大的磨损，而不是剩余的螺纹。
Starting threads on NOT GO plugs are subject to greater wear than the remaining threads.
使用放大镜、针规和千分尺检查模具的磨损程度。
Inspects worn dies to ascertain extent of wear, using loupe, steel gauge pins, and micrometer.
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