将自制的内测量爪,与百分表配套使用(见图),检验六角孔对边尺寸。读数准确,方法简便。具体介绍如下。由套管1铣出两个平面和两条槽,向上的大平面焊有固定短爪2,与测杆上活动短爪4成对。短爪高出平面1.8mm。套管右边的平面上焊有固定长爪3,与活动长爪5成对,高出 Self-made measuring claw, and dial indicator supporting the use of (see Figure), hexagonal hole on the side of the test size. Accurate reading, the method is simple. Specific introduction is as follows. The casing 1 is milled into two planes and two grooves. The fixed large claw 2 is welded to the large plane in the upward direction, paired with the movable short claw 4 on the measuring rod. Short claw height above the plane 1.8mm. The fixed long claw 3 is welded on the right side of the casing, paired with the movable long claw 5 and raised