木工/钳工圆心定位尺Center positioning ruler

本模型在设计时，将尺子位置从中心线向外偏移了0.25mm，预留公差补偿画笔直径造成的公差，如下图所示：

During the design of this model, the ruler position was offset outward by 0.25mm from the centerline, and a tolerance was reserved to compensate for the tolerance caused by the brush diameter, as shown in the following figure:

同时，还在尺子表面设计倒角，方便划线；

At the same time, chamfers are also designed on the surface of the ruler for easy marking;