普通车床在大修理过程中,床身与床鞍导轨副的修理常采用修刨后钳工刮研或以磨代刮。这样,容易改变以床身导轨为基准面的与床鞍有关的几组尺寸链。如我厂首次大修CW6140A普通车床时,采用变位齿轮修正法来弥补对齿条尺寸链产生的△D差值。对走刀箱联系尺寸链产生的△B差值与托架尺寸链中产生△C差值,仍采取移位铰孔的方法来解决以上差值,见图 Ordinary lathe in the process of major repairs, bed and saddle guide rail repair often used after the repair workers fitter scraping or scraping scratch. In this way, it is easy to change the bed rails with the saddle-related group of several size chains. As I plant overhaul CW6140A ordinary lathe, the use of displacement gear correction method to make up for the difference between the size of the rack chain △ D. The difference between △ B and ΔC generated in the chain box due to the size chain still adopts the method of shifting the reaming holes to solve the above difference