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丝锥的切削部分包括1—5五个切削齿(图a),其牙形角为零度,齿厚等于所切螺纹螺距P的一半。校准部分齿6最终形成所切螺纹截面,其校准齿削去尖顶,使截得的齿顶厚c等于切削部分的齿厚。切削部分的几何形状可用以下方法获得。在丝锥的切削部分和校准部分先加工,并磨出牙形角为α的螺纹。接着切出宽度为B的沟槽,沟槽将切削部分和校准部分分开(沟槽的形状和尺寸根据苏联国家标准10543-63选用)。然后
The tap cut consists of 1-5 cutting teeth (fig. A) with a tooth profile angle of zero and a tooth thickness equal to half the cut thread pitch P. The calibrated section tooth 6 finally forms a section of thread cut with its calibrating tooth sharpening the spire so that the thickness c of the intermediated tooth tip is equal to the tooth thickness of the cutting section. The geometry of the cutting part can be obtained by the following method. In the tap part of the cutting and calibration part of the first processing, and grinding out the tooth profile angle α thread. Then a groove of width B is cut out, and the groove separates the cutting part from the calibrated part (the shape and size of the groove are selected according to the Soviet Union national standard 10543-63). then