Manufacturing Intelligence Glossary

Every GD&T symbol, tolerance standard, JPH/cycle-time term, and OEM specification reference precision manufacturers actually use.

Body-in-White (BIW)Body-in-White is the welded vehicle body structure - body sides, roof, floor pan, doors, hood - assembled before paint, trim, or powertrain... Cpk (Process Capability Index)Cpk is a process capability index measuring how well a process produces output within specification limits, accounting for process... Envelope Principle (Rule #1)The envelope principle (ASME Rule #1) states that the surface of a regular feature of size must not extend beyond the en... ISIR (Initial Sample Inspection Report)ISIR (Initial Sample Inspection Report) is the German automotive (VDA) equivalent of PPAP, documenting measured results from initial production samples... ISO 286 Limits and FitsISO 286 is the international standard defining the system of tolerance grades (IT) and fundamental deviations for holes ... JPH (Jobs Per Hour)JPH is the throughput rate of an automated production line - the number of completed units required to be produced in one hour of operation... MIL-A-8625 (Anodize)MIL-A-8625 is the military specification for anodic coatings on aluminum and aluminum alloys, defining Type I (chromic a... Surface Roughness (Ra)Ra is the arithmetic average surface roughness, measuring the mean absolute deviation of the surface profile from its ce... Title BlockThe title block is the rectangular information area in the lower-right corner of an engineering drawing that contains identifying metadata:...