Part I - Tolerancing - Control of Variability. Goals Understand the description and control of variability through tolerancing Understand the various classes of fits Reference Technical Graphics Ch. 6 Dimensions and Tolerances. Agenda. Understand principles of Tolerances
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Ch. 6 Dimensions and Tolerances
Tolerance is the total amount a dimension may vary. It is the difference between the maximum and minimum limits.
Ways to Express:
Feature Control Frame
Geometric dimensioning and tolerancing (GD&T) is a method of defining parts based on how they function, using standard ANSI symbols.
General tolerance note specifies the tolerance for all unspecified toleranced dimensions.
General Tolerances could be in the form of a note similar to the one shown below:
ALL DECIMAL DIMENSIONS TO BE HELD TO .002”
Means that a dimension such as .500 would be assigned a tolerance of 0.002, resulting in a upper limit of .502 and a lower limit of .498
See Table A.1 in the Appendix (pp. A-3 to A-9)
The "minimum size" of the hole is equal to the "basic size" of the fit
Nominal Size = Basic Size