Determination of thread size before electroplating

In machining, the thread is cut on a cylindrical shaft (or the surface of the inner hole) with a cutter or grinding wheel. When the workpiece rotates, the cutter moves a certain distance along the axial direction of the workpiece. The trace cut by the cutter on the workpiece is the thread. The thread formed on the cylindrical surface is called external thread. The thread formed on the inner hole surface is called internal thread. The basis of the thread is the helix on the surface of a circular shaft. Generally, if the thread section is triangular, it is called triangular thread; Trapezoidal section is called trapezoidal thread; The sawtooth shaped section is called sawtooth thread; Square section is called square thread; The section of circular arc is called circular arc thread and so on.