不重磨车刀的角度是由刀片上的角度与刀杆上的角度综合形成的。目前常用的刀片是带孔而不带后角的,如3K、T3K、4K等。为了使这类刀片安装在刀杆上以后能够获得必要的后角α与副后角α_1,须将刀杆上的刀片槽底面作出适当的角度。为了说明方便,我们就称这些角度 The angle of non-restoring lathe is formed by the angle on the blade and the angle on the arbor. At present, the blade is commonly used without holes with a clearance, such as 3K, T3K, 4K and so on. In order for such blades to be mounted on the arbor to obtain the requisite clearance angle α and the secondary clearance angle α_1, the knife blade should be made on the underside of the blade groove at an appropriate angle. For convenience, we call these perspectives