Due to the problem of spatial interference by the high steepness, the contact measuring device can’t measure the high steepness elements surface profile error. Based on the four-axis ultra-precision machine tools and laser micro-displacement sensor, this paper introuduces a method of the measurement experiment platform. It adjusts the geometrical relationship among the machine axes by laser micro- displacement sensor. The accuracy of the measuring device system error is obtained by the high precision standard ball’s measurement. It establishes the position and the error simulation in spherical coordinate system. Applying this measuring system, it can realize the accurate measurement of the dome part’s surface profile error which includes the measuring multiple bus lines and data fitting.
Compared with conventional grinding tools, the chemical vapor deposition (CVD) diamond grinding tools have lots of advantages. However, the practical application of CVD grinding tools is limited, because of the small chip-holding space of abrasive layer. Based on the previous research, the structured grinding tools identified as an available method to improve grinding performance. Therefore, the micro-structured CVD diamond tools were invented. In this paper, the picosecond pulse laser was adopted to machine the micro-structures on CVD diamond. The ablation threshold of CVD diamond film was obtained with picosecond pulse laser. And then, the micro-grooves were machined on diamond film surface with different laser machining parameters. The effects of defocus, laser power, scanning speed, scanning times and machining offset on groove width and depth were analyzed respectively.