How Does Fixture Datum Selection Affect Cab Body-in-White Dimensional Accuracy
Fixture datum selection has a direct effect on cab body-in-white dimensional accuracy because every locating pin, support pad, and clamp transfers a design reference into the real sheet-metal assembly. If the datum scheme is stable, the cab keeps its key openings, mounting points, and panel gaps through stamping and welding. If the scheme is poorly chosen, a small locating error can travel from one panel to the next, then show up as a door fit problem, a windshield opening error, or a cab that does not sit squarely on the chassis. You have to pick datums from cab features that are most stable, control six degrees of freedom with a […]