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Dimensions and Tolerances - Coggle Diagram
Dimensions and Tolerances
Types of dimensioning
parallel dimensioning
several dimensions originating from common reference point
Superimposed Running Dimensioning
simplifies parallel dimensions
Chain Dimensioning
only be used if function of object is not affected by tolerance
Combined Dimensioning
use both parallel and chain dimension
Dimensioning Small Features
place arrowheads outside of extension
Dimensioning of Multiple Features
dimension multiple dimensions (N x Dimension)
Dimensioning of Radius
shows radius dimensioned with center of radius marked
Dimensioning of Circle, Arc, and Hole
circle dimensioned by its diameter and arc is dimensioned by its radius
Dimensioning Angles
marked with dimension line with degree
tolerances
Parts can't be made to exact dimensions due to manufacturing limits
Tolerances allow for acceptable variation
They ensure proper fit, function, and quality
types of tolerance
Bilateral Tolerance
Dimensions can vary in both directions, but not always equally.
Unilateral Tolerance
allowed to vary in only one direction
Limit Tolerance
the upper and lower limits of the dimension are specified
Formula: upper limit - lower limit
Clearance and interference fit
minimum shaft diameter bigger than maximum hole diameter = interference fit
Clearance fit allows parts to move freely, like a door hinge.
Interference fit makes parts hard to move or remove and needs force.
Used where parts must stay fixed, like a shaft in a bearing
Sufficient clearance between shaft and hole means it's a clearance fit.