Provide 3 distinct reasons why we need to use GD T Explain

Provide 3 distinct reasons why we need to use GD & T. Explain with the aid of diagrams. How many form tolerances are shown? What are they? How many datum surfaces are indicated? What are they? Sketch the allowable feature variations (neatly) on the above drawing. Calculate the nominal. minimum and maximum values for the highlighted dimension. Clearly show your work. Assume that this is a rotary component. What additional GD&T; (or other related) information

Solution

Geometric dimensioning and tolerancing is an international language used on drawings to accurately describe a part. The language consists of a well-defined set of symbols, rules, definitions, and conventions that can be used to describe the size, form, orientation, and location tolerances of part features.

GD&T Provides Uniformity By providing uniformity in drawing specifications and interpretation, GD&T reduces controversy, guesswork, and assumptions throughout the manufacturing and inspection process.

GD&T: An Exact Language Geometric tolerancing is an exact language that enables designers to “say what they mean” on a drawing, thus improving product designs. Production uses the language to interpret the design intent, and inspection looks to the language to determine set up.

There are three form tolerances.

Datum B is perpendicular to datum A with tolerance of 0.1

The PROFILE OF SURFACE of the major diameter dia 22 should be in ref to A & B WITH TOLERANCE OF 0.1

All untoleranced surfaces The PROFILE OF SURFACE should be in ref to A & B A & B WITH TOLERANCE OF 0.1