Basic Dimensioning Rules of Dimensioning. Working Drawing Definition: A drawing from which a part can be produced. Must be a complete set of instructions.
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Basic Dimensioning
Rules of Dimensioning
Working Drawing
Definition: A drawing from which a part can be produced.
Must be a complete set of instructions Consists of:
The views needed to describe the shape Dimensions needed for manufacture Notes (materials, etc.)
Dimensions are noted using:
Extension lines
Symbols
Notes
Dimension linesLeaders
Types of Dimensions
Overall dimensions overall length.width and height
Detail dimensions all other dimensions used to describe an object
The standard units measurement Metric = millimeters Imperial = inches Always specify full size dimensions
Place dimensions off between or above views
Dimension a feature where the shape is shown
Dimension a feature only once and always to an object line
Omit one detail dimension in a chain
Place consecutive detail dimensions in line
8-2 Dimensioning Circular Features
Diameters and radii
Cylindrical and slotted holes
Dimensioning Cylindrical Objects
Repetitive features
Dimensioned once with an indication of how many repetitions are required
Chamfers
Normally dimensioned using angle and linear length
Knurls
Expressed in terms of type, pitch, and diameter before and after knurling
Undercuts
Expressed as width by diameter
Plain Undercut
Polar Coordinate Dimensioning
Commonly used in circular planes or circular configurations of features.
Indicates the position of a point, line, or surface with a linear dimension and an angle.
Chain Dimensioning
A series of dimensions is applied on a point-to-point basis.
Chain dimensioning may allow undesirable tolerance accumulation.
Datum or Common-Point Dimensioning
Several dimensions are measured from a common point or line.