The ranges of most optical methods which are used in high precision surface profiling, are limited by the wavelength of light.
在较高精度面形测量的光学方法中，很多测量范围都受到光波波长的限制。
2
Practice proved that profiling finger, sleeve, etc special tools can shorten die manufacturing period and guarantee die manufacturing precision, and can be widely applied.
生产实践证明，仿形指、套筒等专用工具起到了缩短模具制造周期、保证模具制造精度的作用，可以推广应用。
3
The traditional processing method of brake CAM shaft is to process on the profiling machine, with low efficiency and bad precision.