Measuring Surface Finish on Valve Seats
Measuring surface roughness of valve seats on cylinder heads is challenging. The land areas are short, and the roughness values are high. Normally, valve seats require basic roughness parameter analysis by a skidded measuring system. However, because of the short length and high roughness values, some argue that a skidless system is the best way to measure roughness of these surfaces.
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For these reasons—minimizing the effects of mechanical filtering as a result of a long skid length on a longitudinal probe, and having a short skid radius when using a lateral-type skidded probe—skidless measurement probes are often recommended for the evaluation of short-land/high-value applications such as valve seats. Because the datum surface on a skidless system is built into the drive unit rather than being placed at the end of the measurement probe, mechanical filtering of the measurement results does not take place, and measurement results are more accurate.
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