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Dimensions, Tolerance & assemblies - Coggle Diagram
Dimensions, Tolerance & assemblies
Dimensions
provides clear and accurate dimensions
Dimension text
the base dimension
tolerance
+- 0.2 , knowing the range of diemnsion is acceptable
Dimension line
the arrows
Extension line
the line that is extended out from the drawings to know where the dimensions of the drawings is until
extension offset
the gap in between the drawing and extension line
Parallel Dimension (datum dimensioning)
several dimensions
from a
common refernce
surface
superimposed running dimension
simplified verion
of parallel dim
save space
used on drawings
Chain dimension
Original dimension
only use
when if
not affected
by the accumulation of tolerance
Combine Dimension
use both chain & parallel
Dimension small features
difficult to read (inside)
put outside
Dimension multiple features
N x Dimension
indicate multiple same dimentions
Dimensioning of Radius
a) shows the R dim
with the centre of radius
b) dimension of radii with
no centre
located
dimension circle, arc & hole
Circle - diameter
Arc - Radius
Holes- centrelines
Dimensions of angles
:red_cross: should not be duplicated
:red_cross:aviod dim hidden lines
:red_cross:overlap
tolerance
Bilateral
Vary in 2 directions
both direction no need to be the same amount
unilateral
vary in 1 direction
Limit
upper and lower limits are specific
tolerance = upper limit - lower limt
10.3 - 9.8 = 0.5
Clearance fit
an object can fit into the another object
allow 2 parts to move
interference fit
it cannot fit nicely into the other object
difficult to move
assembly
Rigid joint
Fixes two components to one another
Revolute joint
a single rotation degree
