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用普通圆规划线,无论定心和在阶梯表面上划圆和弧都比较困难,且划线的质量差,生产效率低,要求钳工的技术熟练程度也高。图1所示是用废旧卡尺改制成的精密万能圆规。这种圆规有可换的锥形定心装置和接长的中心划针,它能完全克服普通圆规的缺点。其改制的方法、结构和工作原理如下。制造一个导向框20(图1)框内装进压板19和划针2,当拧动螺钉1时,压板19使镶有硬质合金尖的划针2贴紧卡尺左端。把废旧卡尺的固定量脚
Ordinary circular planning line, regardless of the centering and the ladder on the surface of the circle and the arc are more difficult, and the quality of scribing poor, low productivity, requiring fitter’s skilled proficiency is also high. Figure 1 shows the use of scrap calipers converted into a precision universal compasses. This type of compasses has a conical centering device and a long centering stitch, which completely overcomes the disadvantages of conventional compasses. The method of restructuring, structure and working principle is as follows. A guide frame 20 (FIG. 1) is manufactured to insert a pressure plate 19 and a scribe pin 2 into the guide frame 20. When the screw 1 is tightened, the pressure plate 19 causes the scribe pin 2 with the carbide tip to be stuck to the left end of the caliper. The fixed caliper caliper feet