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lesson 6 - Coggle Diagram
lesson 6
dimensions
superimposed running dimension
reduce the space used on a drawing
Parallel Dimensioning (known as datum)
consists of several dimension from a common reference surface
chain dimensioning
object would not be affected by the accumlation of the tolerance
combined dimensioning
use both chain and parallel dimensioning
dimensioning small features
arrow heads between extension may make dimension difficult to read. it can be placed outside the extension line.
dimensioning of multiple feature
use N X dimension in a multiple dimension
dimensioning of radius
radial dimension with capital R
dimension radii did not need their centre locating
centre of radius located in the drawing
dimensioning of circle,arc and hole
arc dimension by radius
located by their centerline
circle is dimension by its diameter
dimensioning Angles
curved dimension dimension line and has degree symbol
assemblies
it is model in a multiple part brought together in a define larger more complex presentation
how it works?
bring the base component because its central role
located with other components in the assembly
tolerance
why is it iimportant?
Same parts can be made from different companies and they have to be interchangeable
types of tolerance
Bilateral Tolerance
allowed two direction in a specified dimension. it can be not be the same amount
Unilateral Tolerance
allowed only one direction
limit Tolerance
upper and lower limits dimension are specified