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Dimensions and tolerances - Coggle Diagram
Dimensions and tolerances
Types of dimensions
Parallel
Superimposed Running
Chain
Combined
small features
Multiple features
Radius
Circle, arc and hole
angles
rules of dimension
Not duplicated
Avoid hidden lines and features
No overlap or crossing
Tolerance
Unilateral
Only one direction
Bilateral
Allowed to vary in two directions and not vary by same amount
Limit
Upper limits and lowers limits are specified
Tolerance = upper limit - lower limit
Clearance fit
there is sufficient clearance for the shaft to interface the hole
allowance for two parts to move eg, door hinge
Interference fit
if the minimum shaft diameter is larger than the maximum hole diameter
difficult to move two interfacing parts eg, shafts are fitted through bearing so the shaft does not slip