ME180 Lecture 14 Geometric Tolerancing

# Feature control frame no additional tolerance as in

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Unformatted text preview: or LMC Very restrictive, seldom used (5%) Used when location or orientation is important Ex: dowel holes, gear centers, press fits, etc. Difficult (impossible?) to verify with functional gaging Must use indicator-type equipment 28 29 Feature Control Frame 30 GD&T Tolerance Zones 31 32 33 34 35 Geometric Characteristic Symbols Straightness Element of a surface or an axis is a straight line Specifies a tolerance zone within which the element of axis must lie Tolerance is applied in the view where the elements to be controlled are represented by a straight line 36 Straightness 37 Straightness 38 Geometric Characteristic Symbols Flatness Condition of a surface having all elements in one plane Flatness tolerance specifies a tolerance zone defined by two parallel planes within which the surface must lie 39 Flatness 40 Flatness 41 Geometric Characteristic Symbols Circularity (Roundness) Specifies a tolerance zone bounded by two concentric circles within which each circular element of the surface must lie 42 Geometric Characteristic Symbols Cylindricity Condition of a surface of revolution in which all points of the surface are equidistant from a common axis Applies simultaneously to both circular and longitudinal elements of the surface (the entire surface) 43 Geometric Characteristic Symbols Profile of a Line Specifies a uniform boundary along a true profile within which elements of the surface must lie Profile of a line is two-dimensional and applies in the view in which shown 44 Geometric Characteristic Symbols Profile of a Surface Specifies a uniform boundary along the true profi...
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