A clamping center angle and the sharp angle center of the clamped drill are positioned on the same shaft center, and the gauges are provided with indication graduations. 其实质是该磨钻头活动卡规是由主卡规和副卡规构成,卡心角与被卡钻头的锋角心位于同一条轴心上并在其卡规上设有指示刻度。
Compound center drill without jacket 不带护套复合中心钻
Adjustable jaws center workpiece in a lathe or center tool in a drill. 在车床或钻孔机中心工具内的可调整中心工件。