摘要
分析了基本尺寸、尺寸公差及公差等级之间的关系；线性尺寸，随着基本尺寸的增大尺寸公差增大，或随着基本尺寸的增大而公差等级提高，这种关系决定了线性尺寸的标注形式；角度尺寸的大小对角度误差影响不大，这一特性决定了角度尺寸的标注形式．
The relation among the basic size, common size difference and crmmon difference grade is analyzed,which determines the form of size mark. The angular size has little influence upon the angular error, the characteristic of which determines the size marking form.
关键词
线性尺寸
角度尺寸
尺寸柱注
精度分析
零件图
linear size
angular size
chain-like form
coordinate form
synthetic form
