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一、跨棒法的原理与公式用跨棒法测量斜齿轮齿厚和用两线法测量螺纹中径相似。将相同半径的两个圆棒(圆球)嵌入同一中心线两端的齿槽中(对于奇数齿,则两个圆棒相对偏离中心线半个周节。)。圆棒嵌入齿槽中的情形如图1。圆棒与两齿面都是点接触。我们假定圆棒是水平放置的,由力的平衡原理可知,两齿面和圆棒的接触点A、B的法线,必然和圆棒的轴线相交于一公共点M。两法线决定的平面,为圆棒的法截面,也就是该平面和圆棒表面的交线是一个圆。M点
First, the principle and formula of cross-bar method Measured by cross-bar helical gear tooth thickness and two-wire method to measure the diameter of the thread similar. Insert two round rods (balls) of the same radius into the slots at the two ends of the same centerline (for odd teeth, the two round rods are offset halfway around the centerline). Round rod embedded in the alveolar situation in Figure 1. Round rod and two tooth surfaces are point contact. We assume that the rod is placed horizontally. It can be seen from the principle of force balance that the normals of the contact points A and B of the two tooth surfaces and the rod intersect the axis of the rod at a common point M. The plane determined by the two normals is the normal section of the rod, that is, the intersection of the plane with the surface of the rod is a circle. M point