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Dimensions and Tolerances and Assemblies - Coggle Diagram
Dimensions and Tolerances and Assemblies
Tolerances
Bilateral Tolerances
Allowed to vary in two directions from the specified dimension
Unilateral Tolerances
Only one direction
Limit Tolerances
The upper and lower limit of the dimension
Dimensions in Drawings
Dimension Line
Dimension Text
Tolerances
Extension Line
Extension Line Offset
Type of Dimensioning
Parallel Dimensioning
Consists of several dimension originating from a common reference surface
Superimposed Running Dimensioning
Simplifies parallel dimension in order to reduce the space used on a drawing
Chain Dimensiong
Should only be used if the function of the object would not be affected.
Combined Dimensiong
Use both chain and parallel dimensiong
Dimensioning Small Features
Placing arrow heads between the extension lines may make the dimension very difficult to read
Radius
Dimension start with capital R
Dimensioning Of Multiple Features
To dimension multiple some dimension
Circle, Arc and Hole
Circle- By in Diameter, Arc - By its Radius and Hole - By their centerlines
Angles
It is marked with a curved dimension line
Clearance and Interference Fits
Clearance
Allow for two parts to move
Interference
Use a lot of force is need to remove the two parts
Assembly Modelling
Revolute Joint
Has a single rotational degrees of freedom
Rigid Joint
Fixes two components to one another, it provides no degrees of freedom