The print is on your desk, the feature control frame reads position at maximum material condition relative to three datums, and the part in your hand either passes or it doesn't — and you have to know which before it ships. Misread one compartment of that frame, pick the wrong datum, or forget the bonus tolerance the larger hole just earned, and you scrap a good part or pass a bad one into an assembly that fails in the field. This book closes the gap between knowing a symbol and applying it correctly, carrying every control from the page of ASME Y14.5-2018 to the drawing, to the machine, to the inspection bench. Here is what this book delivers: • Read any feature control frame as a sentence — name the control, the zone, the modifier, and the datum order so the meaning is never in doubt • Choose datums by function, not convenience — the single decision that wrecks more drawings than any calculation error • Calculate bonus tolerance and virtual condition on demand — turn ASME Y14.5-2018 material condition modifiers into real, earned tolerance at the bench • Set position tolerances from the assembly — apply the floating and fixed fastener formulas before you draw a single zone • Run a tolerance stack-up both ways — worst-case for certainty, root sum square for cost, and know when each governs • Control rotating features with runout — the practical replacement for the concentricity ASME Y14.5-2018 removed • Verify what you draw — match every callout to a functional gage, a coordinate measuring machine, or a surface-plate setup This book serves practicing mechanical and manufacturing engineers, designers and drafters, quality engineers, CMM programmers and inspectors, and candidates preparing for the ASME GDTP certification.
