本文从运动学和间隙曲面几何的角度探讨了麻花钻的环形刃磨工艺，该工艺利用了不规则形状的砂轮。砂轮轴向成形可以通过使用适合金刚石尖端的运动学装置或通过按压来实现。

A toroidal sharpening procedure applied to twist drills is approached in terms of kinematics and clearance surface geometry which makes use of an irregularly shaped grinding wheel. The grinding wheel axial shaping can be achieved by using a device of kinematics suitable to the diamond tip or by pressing.