小模数薄片齿轮是我厂量表产品中的关键零件（见图1），其特点是尺寸小、批量大、加工精度要求高。其中齿圈径向跳动△Fr为齿轮运动精度的重要指标，然而由于零件结构尺寸的局限（内孔φd小于4mm、厚度δ小于1mm），检验十分困难，严重制约了我厂齿轮传动式量表的批量生产。对? Small modulus thin film gear is the key parts of our factory scale products (see Figure 1), which is characterized by small size, large quantities, high precision machining. Among them, the radial runout of ring gear △ Fr is an important index of gear movement accuracy. However, due to the limitation of the size of the part structure (inner diameter φd is less than 4mm and thickness δ is less than 1mm), the test is very difficult and severely restricts the gear transmission type scale Mass production. Correct?