目前各厂通常使用的千分表,与扭簧比较仪相比较,其表敏度较低。尤其是在测量表面光洁度高于10的工件时,触头预压力不宜过大,否则易将表面拉毛;而扭簧比较仪往往因其量程较小和触头部分直径较大,不能完全代替千分表的功用。在这种情况下,千分表就显得太“迟钝”了。为了提高千分 At present, the dial indicator commonly used by each factory, compared with the torsion spring comparator, the table sensitivity is low. Especially in the measurement of the workpiece surface finish higher than 10, the contact pre-pressure should not be too large, otherwise easy to surface hair; and torsion spring comparator is often due to its smaller range and larger contact part diameter, can not completely replace the thousands Sub-table function. In this case, the dial indicator is too “dull”. In order to improve the thousandths