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我厂某飞行器上有一平板零件(如图1),材料为铝合金,在板件的对称平面上沿45°方向钻有一排18个平行减轻孔,直径均为φ15mm,孔深从108～421mm各不相等。由于减轻孔孔深不准会导致零件重心偏移,从而影响飞行器的飞行状态,因而孔深测量较为重要。该零件孔深指孔轴心线和孔口端面的交点到孔底之间的距离。过去我们为了测量孔深,设计了18套专用量具,既麻烦又易出错。后来我们应用0～500mm深度卡尺,在不影响其原来工作性能的前提下,增加了几个辅助
I plant an aircraft has a flat plate parts (Figure 1), the material is aluminum alloy, in the symmetry plane of the plate along the direction of 45 ° drilled a row of 18 parallel relief holes, diameter φ15mm, hole depth from 108 ~ 421mm Each is not equal. Hole-depth measurement is important because mitigating the depth of the hole is not likely to result in a shift in the center of gravity of the part, which in turn affects the flight status of the aircraft. The hole depth of the part refers to the distance between the intersection of the hole axis and the end face of the hole to the hole bottom. In the past we used to measure the depth of holes, designed 18 sets of special measuring tools, both cumbersome and error-prone. Later, we applied 0 ~ 500mm depth caliper, without affecting its original working performance under the premise of adding a few auxiliary