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使用三针测量螺纹单一中径,当钢针外圆与螺纹型面的切点愈接近中径处,半角误差对测量结果的影响愈小。牙型半角对称的螺纹,选用一般手册所推荐的钢针,半角误差对测量结果的影响,无论是对螺纹制件,还是对螺纹量具,都是可以忽略的。牙型半角不对称的螺纹,不管钢针直径选得多么合适,钢针的外圆与螺纹型面的两切点总不能同时接近中径处,与牙型半角对称的螺纹比较,其半角误差对测量结果的影响要大得多。一般资料对牙型半角
When using the three-needle measurement of the single diameter of the thread, the closer the tangent of the outer surface of the needle and the thread profile is to the middle diameter, the smaller the influence of the half-angle error on the measurement result. Tooth type half-width symmetry thread, the choice of the general manual recommended steel needle, half-angle error on the measurement results, whether it is on the thread parts, or on the thread gauge, are negligible. No matter how suitable the thread diameter is, the two points of the outer circle and the thread profile of the steel needle can not be close to the middle diameter at the same time. Compared with the half thread symmetry thread, the half angle error The impact on the measurement results is much larger. General information on the tooth half-width