Clearance Angle. This is the Angle between the machined surface and the underside of the tool called the flank face.

这是机加工面与被称为后侧面的刀具底面夹角。

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The forming of flank of conical twist drill was studied and mathematical model of twist drill tine was founded in order to get formula of back clearance.

研究了锥面麻花钻后刀面的成型，建立了钻尖的数学模型，由此确定了后角的计算公式。

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Deuchar intercepted a mis-hit clearance by Gallacher on the left flank but could not hit the target from distance.

BBC: Kevin Moon and Billy Mehmet