目前一般光学仪器中广泛应用可调式目镜结构,而大节分又是采用多头螺纹进行视度的调节,多头螺纹的配合要求较高,配合间隙要小,转动舒适,因此在机械加工上比较复杂,我厂过去加工此种螺纹是在普通车床上用小刀架分度的工艺方法来加工的,因此存在着很多缺点。如: 一、因导程较大车速不宜太快,故生产率低。二、操作时由于经常开闭马达正转或反 Adjustable eyepiece structure is widely used in general optical instruments, and the large section is the adjustment of the degree of vision by using the multi-head thread. The requirement of the multi-head thread is high, the gap is small, the rotation is comfortable, and therefore the machining is complicated , I plant in the past processing of such threads are in the ordinary lathe with a knife indexing process technology to process, so there are many shortcomings. Such as: First, because of the larger lead speed should not be too fast, so the low productivity. Second, the operation is often due to open and close the motor forward or reverse