一般在分度头上测量角度,是用手拖动装有千分表的表架,使表头直接接触被测件的被测部位。若被测部位是小直径的梢子,则表头很难停放在最高点(当表座与分度头台面相互吸牢时,移动表架也很费力);若被测部位是小孔或小槽,用此法测量角度就不可能了。为了能在光学分度头上测量齿轮 Generally speaking, the angle of measurement on the indexing head is dragged with a watch holder with a dial gauge so that the meter head directly touches the measured part of the device under test. If the test site is a small diameter of the shooter, the head is difficult to park at the highest point (when the table seat and sub-table mesa suction each other, the movement of the table frame is also very laborious); if the test site is a small hole or small Groove, use this method to measure the angle is impossible. In order to be able to measure the gear on the optical indexing head