跨距测量有时稱为篇卡板测量,或稱跨于两齿以上的测量。此种方法已广泛地应用于正齿轮及螺旋齿轮上,具有十分理想的凖确性。可以在齿轮加工过程中进行测量,其准确程度不受外径误差的影响。不需要特殊的技巧,因而可以避免操作人员和检验人员之间的争执。此种测量方法不需要齿轮标准样板、固定用夹具、钢针、或钢珠;仅用一只一吋范围的分厘卡,可以適用于英过范围的节圆直径的工作物。用一支小的卡尺可以方便地测量大的齿轮。该方法是基于渐伸線齿轮齿面上任何法線包含 Span measurements are sometimes called palletizing measurements, or measurements spanning two or more teeth. This method has been widely used in spur gears and helical gears, with very good accuracy. Can be measured during gear machining, the accuracy of the diameter from the outside error. No special skills are required, so disputes between operators and inspectors can be avoided. This measurement method does not require the gear standard template, fixture, pin, or steel ball; only one inch range of PCT card, can be applied to the British over the scope of the pitch diameter of the work. With a small caliper can easily measure large gear. The method is based on any normal of the involute gear tooth flanks