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Engineering Design (Lesson 6) - Coggle Diagram
Engineering Design (Lesson 6)
Types of dimensioning
Parallel Dimensioning
Superimposed Running Dimensioning
Chain Dimensioning
Combined Dimensioning
Dimension Rules
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
Avoid dimensioning to hidden lines and features
Dimension lines, extension lines and object outlines should not cross or overlap
Types of tolerance
Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
Unilateral Tolerance: allowed to vary in only one direction
Limit Tolerance: the upper and lower limits of the dimension are specified
Calculating Tolerance
Tolerance = Upper limit – Lower Limit
Type of Fit
clearance fit
In clearance fit, there would still be an allowance for two parts to move, such as in a door hinge
interference fit
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. Examples are shafts that are fitted through bearings, so that the shaft does not slip
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.
types of joints in Fusion 360
Rigid
Rigid Joint: Fixes two components to one another; it provides no degrees of freedom.
Revolute
Revolute Joint: Has a single rotational degree of freedom, much like a hinge.
Slider
Cylindrical
Ball
Planar
Pin Slot