Measurement Standards Linear measure-inch, foot, yard, meter Standards kept by governments; meter=1,650763.73 wavelengths Kr. Sensitivity-also called resolution, is the smallest
difference in dimensions that the instrument can detect or distinguish. Precision-the degree to which the instrument gives repeated measurements of the same standard.
Allowance Basic size Bilateral tolerance Clearance Clearance fit Datum Feature Fit Geometric tolerancing Hole-basis system interferance
Interferance fit IT Grade Limit dimensions Macumum material condition Nominal size Positional tolerancing Shaft-basis system Standard size Transition fit Unilateral tolerancing Zero line
Engineering Metrology and Instrumentation
Limits and fits
Running and sliding Locational clearance Locational transition Locational interferance Force and shrink Metric classification