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Dimensions Tolerances and Assemblies - Coggle Diagram
Dimensions Tolerances and Assemblies
Tolerances
Why is it important
Prevents rejection of parts
Ensures that parts made by different companies are able to work with each other
Ensures quality control
Ensure mating of parts with fit properly according to the schematics
Limit Tolerance
upper and lower limits of the dimension is specified
2.3007
2.3000
This means that the dimensions are able to only vary at a point of 0.007
Unilateral Tolerance
Allow to vary only in one direction
70.7+0.3
This means the object can only vary up till 71.0
Bilateral Tolerance
allows for variation in two directions from the specified direction
59+-0.3
This means the object can be 59.3 or 58.7
Fitting
Clearance Fit
Made for a part to have space when passing through
Pen cap or pen ink cartridge when inserting it into a barrel
Interference fitting
Made to be forced together or to cause friction so that parts are not so easily separated
hammering a wooden dowel into a plank with a hole diameter smaller than the dowel to make a tighter fit
Assembly modelling
Why is it important?
When animated, an assembly model is able to display how the product is supposed to come together
It can show how each part should be oriented, the steps or order the parts are supposed to come together and also how the assembly should work
Joints
Rigid
Fixes two components together providing no room of movement
Revolute
Provides a single point of rotation for movement like a door hinge or a book