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Introduction to Assemblies
Chapter 6
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Assemblies
• Assembly files consist of multiple parts and the mates that define constraints between parts
• By default, the first part placed in the assembly is fixed in space
• Subsequent parts are free to move (translate and rotate) except as constrained by mates
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Assembly Example
• These two blocks are to be combined as shown.
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Placement of First Part
• Placing first part at the origin of the assembly is good practice – allows for Front, Top, and Right planes of the assembly to be used as planes of symmetry
• Instead of clicking in the graphics area to place the first part, click the check mark (OK) to place it at the origin
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Placement of Subsequent Parts
• Subsequent parts are placed at arbitrary locations – can be moved and rotated within the assembly until motion is constrained by mates
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Fixed
Floating
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Moving Parts Within an Assembly
• Click and drag with left mouse button to translate
• Click and drag with right mouse button to rotate
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Moving Parts Within an Assembly (cont.)
• The Triad Tool allows for more precise movements.
• Click and drag on an axis to translate along that axis
• Click and drag on a circle to rotate about the axis associated with that circle
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First Part Placed in Assembly is Fixed
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Mate 1 – Concentric Mate
• Two cylindrical faces are selected
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Mate 2 – Coincident Mate
• Back face of small block and front face of large block selected – the mate places the two faces in the same plane
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Effects of First Two Mates
• Small block’s allowed movements are now restricted to rotation about the axis of the holes
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Mate 3 – Parallel Mate
• Top surfaces are constrained to be parallel
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Small Block is Now Fully Constrained
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Editing Mates
• Mates are stored in the FeatureManager, can be edited or deleted.
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Tips for Adding Mates
• If the wrong entity is selected, click it again to de-select it, or right-click in the graphics area and choose Clear Selections
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Tips for Adding Mates (cont.)
• Use Select Other for selecting hidden faces without rotating the view orientation
Right-click, choose Select Other
Left-click desired face
Back face is now selected
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Tips for Adding Mates (cont.)
• Use a filter to help select small features
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Tips for Adding Mates (cont.)
• When filter is active (indicated by icon next to cursor), only that type of entity can be selected
• Make sure to clear filters when finished
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Tips for Adding Mates (cont.)
• Useful keyboard shortcuts:• x: turn on selection of faces (most mates are
made between faces)• F6: turns off selected filter
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