CMM valve seat measurement solution

The measurement of valve seats and guides has traditionally been so challenging and time-consuming that methods used are often a compromise and do not allow for responsive process feedback. Renishaw's solution enables very fast collection of large amounts of data, from which the analysis parameters for both the valve seat and the valve guide features can be calculated. The method performs exceptionally well in both repeatability and reproducibility tests, and takes as little as 20 seconds per valve. The new measurement process involves two helical scans, one on the valve guide bore and the second over the valve seat area. On the guide, a single helical scan is used with a typical pitch of 0.5 mm, at a scanning speed of 150 mm/s, while for the seat, a single helical scan is carried out at a finer pitch of 0.1 mm and a faster scanning speed of 500 mm/s. The latter scan utilises REVO's adaptive scanning capability, which allows a single scan command to cover the areas above and below the critical valve seat surfaces. The two measurement routines rapidly capture all necessary data about the valve seat and valve guide surfaces, which is then analysed within a utility embedded in Renishaw's new MODUS metrology software.