The measurement of parts generally uses two vision tools, pattern matching and edge detection individually or in combination. These tools are very fast when properly applied. Speeds of over 100 measurements per second are not uncommon. With today's vision engines, repeatability within .0003 is common-place at these speeds. Lighting techniques become very important in achieving the utmost accuracy. It is important to involve Alcock Consulting at the earliest stages of your project so that staging and space requirements can be designed into your process.