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Dimensions, Tolerances & Assemblies - Coggle Diagram
Dimensions, Tolerances & Assemblies
Dimensions
Types of Dimensions
Parallel (Datum),
Superimposed running,
Chain,
Combined,
Small features,
Multiple features,
Radius,
Circle, arcs & holes,
Angles
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 repeated, especially in different views
Tolerances
Types of tolerances
Unilateral
Limit
Bilateral
Tolerance = Upper limit – Lower Limit
Clearace fits
Allowance for two parts to move
Interface fits
A lot of force is needed to remove the two interfacing parts.
Assembly Modeling
Assembly joints are used between components
Assembly joints
Revolute
Has a single rotational degree of freedom
Rigid
Fixes two components to one another, provides no degrees of freedom
Each component needs to be oriented to the other components
Assembly begins with a base component because of its central role