Please enable JavaScript.
Coggle requires JavaScript to display documents.
Dimensions, Tolerances and Assemblies - Coggle Diagram
Dimensions, Tolerances and Assemblies
Dimensioning
-
-
Chain dimensioning
Should only be used if the function of the object would not be affected by the accumulation of the tolerances
-
-
-
-
Dimensioning of Circle, Arc,
and Hole
-
-
-
-
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
-
Dimension lines, extension lines and object outlines should not cross or overlap
Tolerance
Bilateral Tolerance
allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount
-
-
-
In practice, parts cannot be manufactured exactly to the dimensions stated in the drawing, due to manufacturing variations. Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations.
Assemblies
Clearance fit
there would still be an allowance for two parts to move, such as in a door hinge.
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.
-
Revolute Joint
Has a single rotational degree of freedom, much like a hinge.