Since the constructed of 12 GeV proton synchrotron started 35 years ago, technologies have been dramatically developed. Computers, software, hydrostatic bearing and scanning tunneling microscope have given us a big impact on accelerator development. Computer aided numerical control machine can realized any shape with an accuracy of nanometer order. Hydrostatic bearing can be used for ultra high-precision tuning and milling, and scanning microscope for the observation of surface roughness with atomic level. In this article, we describe the development of accelerator related precision engineering technologies utilizing these new technologies.