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过去我们镗发动机汽缸时,采用镗刀刀尖定心。用这种方法定心准确性差,并且不能校正缸套的垂直度,影响了加工质量。最近修理车间镗工胥锦云同志制作了一种百分表定心器,结构如图1所示。固定套2以固定螺钉1固定在镗床镗杆上。在固定套2上焊有立柱4,在立柱4上用螺钉固定着两个夹板9,此上装有固定轴7,杠杆8可绕固定轴7摆动。杠杆上端接触百分表量头,下端装有触杆6。制作时杠杆中心要保持a= b(如图2)。触杆6表面淬火到HRC52～56,圆头表面光洁度达▽▽▽7。
In the past when we bore the engine cylinder, the use of boring tool centering. In this way, the centering accuracy is poor, and the verticality of the liner can not be corrected, which affects the processing quality. Recently repaired shop boring workers Comrade Xu Jinyun produced a dial indicator setter, the structure shown in Figure 1. The fixing sleeve 2 is fixed on the boring bar by the fixing screw 1. A stud 4 is welded on the fixing sleeve 2, two splints 9 are fixed on the stud 4 by screws, a fixing shaft 7 is mounted thereon, and the lever 8 can swing around the fixing shaft 7. The upper end of the lever is in contact with the gauge head and the lower end is equipped with the contact lever 6. Production lever center to keep a = b (Figure 2). Rod surface hardened to HRC52 ~ 56, round head surface finish ▽ ▽ ▽ 7.