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Lesson 6 - Coggle Diagram
Lesson 6
Dimension
The 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 outline should not cross or overlap
9 types of dimensioning
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Superimposed Running Dimensioning
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Dimensioning small features
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Dimensioning of multiple features
Dimensioning of circle, ark, and hole
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Tolerance
In practice, parts cannot be manufactured exactly to the dimensions stated in the drawing, due to manufacturing variations. Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations
3 Types Of Tolerance:
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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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Fits
In clearance fit, there would still be an allowance for two parts to move, such as in a door hinge.
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
Assembly Modelling
What is Assembly Modelling?
In an assembly model, multiple parts are brought together to define a larger, more complex product representation. Assembly modelling facilitates the collaboration among designers, engineers, manufacturing technicians and others to ensure a product assembly works. Individuals in different disciplines can work concurrently, resulting in faster and less costly delivery of products to market
How Assembly Modelling Works?
Constructing an assembly normally begins with bringing in a base component, selected because of its central role. Each component brought in needs to be oriented and located relative to other components in the assembly. Assembly joints are used between elements of components.