# Basic Assembly Assembly Constraints Assembly constraints are parameters

Basic Assembly

Assembly Constraints • Assembly constraints are parameters that define geometric relationships between components in a CAD assembly • Constraints include Mate/Flush Angle Tangent Insert

Degrees of Freedom • A component floating in space has six degrees of freedom 3 rotations around X, Y, and Z axes 3 translations along X, Y, and Z axes • Degrees of freedom are systematically removed in an assembly until only the desired components are allowed to move

Mate Constraint • Constrains two faces, edges, points, or axes together • Red arrows represent normal vectors and point toward each other

Flush Constraint • Constrains two faces or work features together • Normal vectors will point in the same direction

Angle Constraint • Constrains two faces or edges at an angle to one another • Normal vectors parallel to each other equal 0° angle

Insert Constraint • Constrains a cylinder flush into a hole

Tangent Constraint • Constrains a curved surface to a plane or another curved surface

Base Component • First component placed in an assembly should be a fundamental part or subassembly – E. g. , a frame or base plate, on which the remainder of the assembly is attached • First component in an assembly file sets orientation of subsequent parts and subassemblies

Grounded Component • When the first component is placed in the assembly, its origin is coincident and aligned with the assembly coordinate origin • All degrees of freedom are removed from the first component • Base component will be grounded and should be left that way

Editing Components • Double click on a component to exit the assembly environment and enter part environment • Other components in the assembly will become translucent • When finished editing a part, exit the part environment and return to the assembly environment

Today: Gather and Complete the following – – – – – Title page Brief autobiography and your picture Puzzle Design Challenge Brief Brainstorming Possible Part Combinations (Activity 4. 1 a Puzzle Part Combinations) Isometric sketches of two possible complete Puzzle Cube designs Justification of your chosen Puzzle Cube design solution Multi-view sketch, fully dimensioned of each of the five puzzle parts in your chosen design (Activity 4. 1 b Graphical Modeling) Physical model of your puzzle. Statistics related to the solution time of your puzzle as required above. CAD drawings for each part, colored the same as the puzzles you built placed into an assembly.

Next Week – CAD drawing(s) displaying a fully dimensioned multiview of each puzzle part and two different isometric views of the assembled puzzle. – Drawing review comments from a classmate. – A written summary of your puzzle test results and a discussion of the validity of your design. Does your design meet the design criteria? Does your design “provide an appropriate degree of challenge to a person who is three years of age or older” (as stated in the design statement)? – A discussion of possible changes to your puzzle cube that would improve the design.

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