单件或小批生产中,常常遇到工件上有两个或几个平行孔,孔距有精度要求。在没有钻模的情况下,怎样才能钻出合格的平行孔呢? 如图4所示,要钻d_1和d_2两孔,孔距为L。首先划线,先钻出一个孔,例如,先钻出直径为d_1的孔。如孔精度要求较高,还可用铰刀铰一下。然后用一直径为d_1的销子与孔紧配。再用一直径为d_3的销子夹在钻夹头中,用卡尺或千分尺控制尺寸L_1,就能保 In one-piece or small-batch production, there are often two or more parallel holes in the workpiece, the pitch of which is required. In the absence of drilling die, how to get a qualified parallel hole? As shown in Figure 4, to be drilled d_1 and d_2 two holes, hole spacing L. First scribe, first drilled a hole, for example, first drilled hole diameter d_1. If the hole accuracy is higher, but also reamer hinge. Then use a pin of diameter d_1 to mate with the hole. Re-use a diameter d_3 pin clip in the drill chuck, with a caliper or micrometer size L_1, will be able to protect