用过—般圆柱量规(Plain cylinderical pluggage)的人,差不多都有一个感觉;量规在插入所量的孔时,相当的不容易而且费时间。在进入孔时,量规中心固然须和孔之中心缐相符合,然而进入后,稍稍偏置,即生挤阻现象。若用力插入,既要损坏工作品,对量规本身亦有伤害,故必须拔出后再量,因而浪费时间。当所量之孔的位置比较难于达到或处于特殊地位的时候,用这种量规更是困难。现在我们介绍几种经过改进的量规。 People who used a plain cylinderical pluggage almost had a feeling that gauges were not easy and time-consuming to insert the amount of holes. While entering the hole, the center of the gauge should be consistent with the center of the hole. However, after entering, the gauge is slightly offset, which means the phenomenon of crowding resistance. If you force the insert, it is necessary to damage the work, the gauge itself also hurt, it must be unplugged and then, so wasting time. When measuring the location of the hole is more difficult to reach or in a special position, the use of such gauge is more difficult. Now we introduce several improved gauges.