Introduction to Fundamentals of Assembly in ProE

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Introduction to Fundamentals of Assembly in Pro/E
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Bottom-Up Design (Modeling)
The components (parts) are created first and then
added to the assembly file. This technique is
particularly useful when parts already exist from
previous designs and are being re-used.
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Top-Down Design (Modeling)
The assembly file is created first and then the
components are created in the assembly file. The
parts are build relative to other components.
Useful in new designs
In practice, the combination of Top-Down and
Bottom-Up approaches is used. As you often use
existing parts and create new parts in order to
meet your design needs.
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Assembly and Exploded View
Assembly View
Exploded view
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Degrees of Freedom
An object in space has six degrees of freedom.

• Translation movement along X, Y, and Z axis
  (three degrees of freedom)

• Rotation rotate about X, Y, and Z axis
• (three degrees of freedom)

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Assembly Constraints
In order to completely define the position of one
part relative to another, we must constrain all
of the degrees of freedom.
Mate, Align, and Insert
Mate Two selected surfaces become co-planar and
face in opposite directions. This constrains 3
degrees of freedom (two rotations and one
translation)
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Assembly Constraints
Align Coincident Two selected surfaces become
co-planar and face in the same direction. Can
also be applied to revolved surfaces. This
constrains 3 degrees of freedom (two rotations
and one translation).
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Assembly Constraints
Align Offset This can be applied to planar
surfaces only, surfaces are made parallel with a
specified offset distance.
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Assembly Constraints
Insert This constrain can only be applied to two
revolved surfaces in order to make them coaxial
(coincident).
Used with cylindrical surfaces
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Fundamentals of assembly in Pro/E
In pull down menu File, select new and then
choose Assembly option.
Select
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Adding Components
In the pull-down menu, select Insert gt Component
gt Assemble
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Mating Components
Choose constraint type
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Informs you if the assembly is fully or partially
constrained
Add new constraint
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Creating an Assembly
Part
Part
Assembly
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Creating an Assembly Example
The example assembly requires three mates to
fully define it.
First constrain Mate between the hollow faces as
shown.
Hollow faces
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Example
Second Constrain Align the right faces of both
components.
Right side faces
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Example Switch Plate
Switch plate consists of two components, plate
and fasteners.
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Example Switch Plate
First Constrain Insert select the cylindrical
face of the fastener and the cylindrical face of
the switch plate.
Two degrees of freedom remains, the fastener can
still move in and out and rotate inside the hole.
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Example Switch Plate
Second Constrain mate the flat circular back
face of the fastener and the flat front face of
the switch plate.
The assembly is fully constrained.
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Example Switch Plate
Align Orient could be used to line up the slot on
the screw head with the flat top face of the
switch plate.
The assembly is fully defined
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Example