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Geometrical Dimensioning & Tolerancing (GD&T)

Department of Mechanical Engineering and MechanicsFundamentals of Computer Aided DesignGeometrical Dimensioning & Tolerancing (GD&T) MEM 201 Department of Mechanical Engineering and MechanicsToday s Tolerances and why do we need them. Different types of tolerances. To learn how to effectively tolerance parts in engineering drawings. Allowance/Clearance Expressing tolerances in of Mechanical Engineering and MechanicsTolerancing Definition: Allowance for a specific variation in the size and geometry of part. Why is it needed: No one or thing is perfect ! Hence, engineers have come up with a way to make things close to perfect by specifying Tolerances! Since variation from the drawing is inevitable the acceptable degree of variation must be specified.

Geometric Tolerancing • Allows for specification of tolerance for the geometry of a part separate from its size • GDT (Geometric Dimensioning and Tolerancing) ... • Circular hole patterns may be defined with polar coordinate dimensioning. • When possible, dimension angles in …

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