![]() This means we can only use 50% of the total tolerance band for the parts to be capable. ![]() In this case, the total range of samples must measure between 246.34825mm and 246.41175mm (☐.03175mm). An example is a nominal dimension of 246.38mm with a ☐.127mm tolerance and a Cpk of 1.33 (typical for automotive). It means that the higher the Cpk requirement is, the closer to the nominal dimension the part must measure. But what does this mean to the mold designer or mold maker? ![]() For products or parts to be validated, they typically must pass a capability study with a process capability index (Cpk) of 1.33 or 1.67. ![]() However, there is more to the project than just being “in spec”. Often, the largest concern of mold designers or mold makers is to ensure the parts are within specification.
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