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大多数带有孔的机器零件都有内外径的同心度要求。对内径有自由公差的长工件,检验时要在刻度盘上获得准确的读数非常困难。为了克服过大的指针变化,设计了一个特殊柱塞,该柱塞当工件旋转时能以恒定压力压在工件内孔表面。二个弹簧支承的滚珠提供压力抵住工件内孔表面,上述结构可以进行调整并可防止刻度读数的变化。当工件内径在φ7.62～31.75mm范围时,柱塞孔的直径取约0.127～0.254mm,小于内径研磨工具的直径。对大的工件间隙稍微大些,这取决于所用滚珠的尺寸。为
Most machined parts with holes have concentricity requirements for inside and outside diameters. It is very difficult to obtain accurate readings on the dial for long workpieces with free tolerances on the inside diameter. In order to overcome the excessive pointer change, a special plunger is designed which presses the workpiece bore surface at a constant pressure as the workpiece rotates. Two spring-loaded balls provide pressure against the workpiece bore surface. The above structure allows for adjustments and prevents changes in the scale reading. When the workpiece diameter φ7.62 ~ 31.75mm range, the diameter of the plunger hole to take about 0.127 ~ 0.254mm, less than the diameter of the diameter of the abrasive tool. For larger workpieces the gap is slightly larger, depending on the size of the balls used. for