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该检具可扩大游标卡尺的测量范围,它由衬套5、衬套—丝杆4、衬套—螺母3和手柄1构成。在衬套5的滚珠轴承内装有摩擦滚轮6,该滚轮通过丝杆2与螺母—丝杠传动机构相联。手柄1固定在游标卡尺尺身前端,衬套5固定在尺身尾端,而丝杆2与游标卡尺的游框连接。如果零件尺寸不超过游标卡尺主刻度尺长度,则用量爪进行测量,而滚轮用于微分讲给;如果零件尺寸超过主刻度尺长度,则
The gauge can expand the measuring range of the vernier caliper, which consists of a bushing 5, a bushing - a screw 4, a bushing-nut 3 and a handle 1. A friction roller 6 is arranged in the ball bearing of the bushing 5 and is connected with the nut-screw drive mechanism through the screw rod 2. The handle 1 is fixed on the front of the caliper ruler, the bushing 5 is fixed on the tail end of the ruler, and the screw rod 2 is connected to the travel block of the vernier caliper. If the part size does not exceed the main scale length of the vernier caliper, it is measured with a gripper and the wheel is used to differentiate; if the part size exceeds the main scale length