theory of cad i
DESCRIPTION
ensc 489 topic 2TRANSCRIPT
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Theory of CAD I
Sketches, 2D
ENSC 489
Mike Henrey
September 16, 2015
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Geometry and terminology
Axis
Plane
Origin
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Geometry and terminology
Face
Edge
Vertex
Base feature first feature created
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Degrees of freedom (DOF)
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DOF
Point on a 2D sketch
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DOF
Line on a 2D sketch
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DOF
Arc on a 2D sketch
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Relations
In SolidWorks, you can add relations between sketch elements
Relations work by reducing the number of DOF that each sketch element has
Note that dimensioning a sketch element also reduces the number of DOF that the element has in this sense, a dimension is a type of relation
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Coincident
Points
Line and point
Arc and point
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Horizontal/Vertical
Points
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Co-radial
Arcs and circles
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Equal
Radius
Lines
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Other
Parallel
Perpendicular
Tangent
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Fully constrained
In SolidWorks, when a sketch is fully constrained, all the sketch elements become black
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From Sketch to 3D
Basic workflow in SolidWorks:
Select a (2D) plane
Sketch on the plane
Create 3D geometry from the sketch
Select new plane, repeat