Abstract: Four essentials of the self-collimation design principle of machine bed are narrated on the basis of successful application of the new-type self-collimation guideway grinders, their kernel is to make gravitational deformation of machine bed automatically compensate for its thermal deformation which is caused by the variety of environmental temperature. To verify the self-collimation design principle, some experiments such as groundsill stability, self-collimation characteristics of simulant parts and grinding are carried out, their results show that the machine bed’s guideway of the new-type self-collimation guideway grinder possess higher precision stableness.

Key words: Gravitational deformation, Guideway grinder, Precision stableness of machine bed’s guideway, Self-collimation, Thermal deformation