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Dimensions and Tolerances - Coggle Diagram
Dimensions and Tolerances
1.Types of Dimensions
1.Parallel Dimensioning/Datum
Several dimensions from the common reference surface(Datums)
3.Chain Dimensioning
If the function of the object is not affected by tolerances
4.Combined Dimensioning
Both chain and parallel dimensions
2.Superimposed running Dimensioning
Simple parallel dimensions to reduce space used in drawings
5.Dimensioning small features
arrow heads outside extension lines for better visibility
6.Dimensioning of multiple features
Multiple same dimensions (N x Dimension)
7.Dimensioning of radius
Dimensions that starts with R on curves or circles
8.Dimensioning of circle,arc & hole
Circle dimensioned by Diameter, Arc dimensioned by radius and Hole dimensioned by centerlines
9.Dimensioning Angles
Angles dimensioned with a Degree symbol
3.Tolerances
Bilateral Tolerance: allowed to vary in two directions from the specified dimension
Unilateral Tolerance: allowed to vary in only one direction
Limit Tolerance: the upper and lower limits of the dimension are specified
FORMULA:Tolerance = Upper limit – Lower Limit
2.Rules of dimensioning
Avoid dimensioning to hidden lines and features
Dimension lines, extension lines and object outlines should not cross or overlap
Dimensions should not be duplicated