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Dimensions, Tolerance and Assemblies - Coggle Diagram
Dimensions, Tolerance and Assemblies
Rules of Dimensions
- Should be neat and not be duplicated.
- Avoid dimensioning hidden lines & features
- Dimension liners, extension liners and object outlines should not cross or overlap.
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Assembling modelling
Multiple parts bought together to define a larger, more complex product representation
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.
Types of joints
Rigid, Revolute, Slider, Cylindrical, Pin Slot, Planar, Ball
Revolute joints: has a single rotational degree of freedom, much like a hinge
Rigid joints: Fixes two components to one another, it provides no degrees of freedom
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Clearance Fit
There would still be an allowance for two parts to move, such as in a door hinge
Interference Fits
difficult to move (or remove) the two interfacing parts. Usually needs a lot of force to remove the two parts.
Example : shaft that are fitted through bearings, so that the shaft does not slip.