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dimensions, Rules of Dimensioning, types of tolerance, Assembly Modelling,…
dimensions
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System where dimensions are measured from feature to feature rather than from a common reference point. Tolerances add up from one feature to the next.
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Aligning text inside the part outline may result in poor legibility. Place dimension text outside the part outline whenever possible.
Use a single dimension for repeated features whenever possible. For example: 4 x Ø8 means four features with a diameter of 8 units.
Always dimension arcs and fillets with a radius. Indicate with ‘R’ preceding the value.
For small arcs, it is necessary to indicate whether it is inside or outside.
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Holes are located by their centerlines, which may be extended and used as extension lines.
Can use either a length dimension and angle, or two length dimensions to define the feature.
Rules of Dimensioning
Generally, dimensions and drawings must be neat. In addition,
Dimensions should not be duplicated, i.e. same dimension should not be repeated on different views, or the same information need not be given in two different ways
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Dimension lines, extension lines and object outlines should not cross or overlap
types of tolerance
Calculating Tolerance
Tolerance is defined as the difference between the upper limit of a dimension and the lower limit of the dimension. Its formula is given by:
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Bilateral Tolerance: Allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
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Assembly Modelling
definition
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Facilitates collaboration among designers, engineers, and technicians
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Faster, less costly product delivery
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