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在现场加工过程中,对内螺纹中径可用如下方法测量: 将经过检定的三个直径相等的圆球(如图所示),置于内螺纹沟槽内,用量块测量出M值,计算出中径大小。由于圆球在内螺纹横断面内,圆球始终要沿螺旋线方向滚动,当滚动到圆周的最高点时,即为内螺纹制件的中径尺寸。因此,三球测量法在一定测力作用下,又具有自动定位特性,只要能正确使用量块,就
In the field of processing, the diameter of the internal thread can be measured by the following method: The three test the same diameter of the ball (as shown), placed in the thread groove, measured with the amount of M value calculated The diameter size. As the ball within the thread cross-section, the ball always along the helix direction of rolling, when rolling to the highest point of the circle, is the internal diameter of the workpiece size. Therefore, the three-ball measurement method under the action of a certain force, but also has automatic positioning features, as long as the correct use of measuring block