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7.4 Assembly Models
Transcript of 7.4 Assembly Models
Assembly Constraint: Parameters that define geometric relationships between components in a CAD assembly.
Types of Constraints:
- Components can be individual parts or subassemblies.
7.4 Assembly Models
By: Josh M., Jake E., and Irene K.
Used to constrain two edges, faces, points or axes together.
- Red arrows (normal vectors) point toward each other
Constrains two faces or features together. Used to align faces.
- Normal vectors will point in the same direction.
Degrees of Freedom:
-3 rotations around the x, y, and z axis
-3 translations around the x, y, and z axis
Angle Constraint: constraints two faces/edges at an angle to each other
Insert Constraint: constraints a cylinder with a hole or edge
Tangent Constraint: constrains a curved surface to either a plane or another curved surface
- Subassemblies are groups of components that act as one single unit.
Types of Components:
Base Component: 1st component placed in an assembly, should be a fundamental part (ex. a frame on which the rest of the assembly is attached)
Grounded component: when a component is grounded, it loses all degrees of freedom. The base component should be grounded.
Patterning Component: Function duplicates one or more components
- Replace Component: a new component is placed in the same location as the original component. Any assembly constraints may be deleted.
- Editing Components: used to edit a part
Shows how different parts of a multi-component design fit together
May contain: One or more views, dimensions, balloons, parts list or bill of materials (BOM)
Types of assembly drawings:
- Design Assembly
- General Assembly
- Detail Assembly
- Erection Assembly
- Pictorial Assembly
- show relationships between components.
- often based on preliminary/the first sketches before product is modeled. Working models usually evolve from these.
- most common
- does not have dimensions
- displayed as a multi view drawing
Detail Assembly: combines an assembly view with several parts as dimensioned multi view drawings on one sheet.
- More suited for designs with less components
- Reduces number of drawing sheets needed
Erection Assembly: similar to general assembly, typically associated with cabinetry or products made from structural steel.
Subassembly Drawing: these show how to assemble components of the overall project
Often used in catalogs and advertisements, the pictorial is sectioned to show interior details
Usually an isometric or perspective drawing
Can be drawn in an exploded view
- A circle with a number that is connected to an assembly component with a leader line
Balloons correspond to item numbers in the part list
Balloons in an assembly drawing should be the same size and easy to read