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Dimensions Tolerances and Assemblies - Coggle Diagram
Dimensions Tolerances and Assemblies
Dimensions
Type of Dimension
Superimposed Running Dimension
Simplifies parallel dimensions in order to reduce the space used on drawing
Parallel Dimension
consists of several dimensions originating from a common reference surface
Chain Dimension
If the function of the object would not be affected by the accumulation of tolerances
Combined Dimension
use both chain and parallel dimensioning
Dimensioning Small Features
Place arrow head outside the extension line
Dimensioning of Multiple Features
Use N x Dimension
Dimensioning of Radius
Dimensioning of Circle, Arc and Hole
Dimensioning Angle
Rules of Dimensioning
Dimensions should not be duplicated
Avoid dimensioning to hidden lines and features
Dimension lines, extension lines and object outlines should not cross or overlap
Tolerance
The Importance of tolerance
parts cannot be manufactured exactly to the dimensions
included with dimensions in engineering drawings to take into account these manufacturing limitations
included with dimensions in engineering drawings to take into account these manufacturing limitations
Types of Tolerance
Unilateral Tolerance
allowed to vary in only one direction
Limit Tolerance
the upper and lower limits of the dimension are specified
Bilateral Tolerance
allowed to vary in two directions from the specified dimension
Both directions need not vary by the same amount.
Assembly Modelling
What is Assembly Modelling
facilitates the collaboration among others to ensure a product assembly works
multiple parts are brought together to define a larger, more complex product representation.
Type of Joints
Slider
Cylindrical
Revolute
Pin Slot
Rigid
Planar
Ball
Clearance Fit and Interference Fit
In clearance fit, there would still be an allowance for two parts to move
In interference fit, it would be difficult to move (or remove) the two interfacing parts. Usually, a lot of force is needed to remove the two parts.