MAE184_Assembly

# MAE184_Assembly - MAE 184 MAE Assembly Fundementals Content...

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MAE 184 MAE 184 Assembly Fundementals Assembly Fundementals

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MAE 184 Assembly 2 Content: Content: The lesson is organized as follows: 1.Discussion of Assembly Constraints 2.Assembly Design Issues 3.Assembling the Components 4.Assigning Appearances
MAE 184 Assembly 3 Assembly Constraints Assembly Constraints We specify assembly constraints to fit the various components together. The geometric relation between any two parts has six degrees of six degrees of freedom freedom : : 3 translational and 3 rotational. In order to completely define the position of one part relative to another, we must constrain or provide values for all these degrees of freedom. the part relation needs to be fully constrained .

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MAE 184 Assembly 4 This symbol illustrates the three translational and rotational degrees of freedom available. Degrees of Freedom
MAE 184 Assembly 5 Assembly Constraints There are a number of constraint types that we can specify. (In this lesson, we will use six of them.) The individual constraints are used with the surfaces, axes, and datum planes of the two parts. The constraints usually must be used in combinations in order to The constraints usually must be used in combinations in order to fully constrain all 6 degrees of freedom fully constrain all 6 degrees of freedom . Here are all the constraint types: MATE COINCIDENT (or just MATE for short) MATE OFFSET ALIGN COINCIDENT (or just ALIGN for short) ALIGN OFFSET ALIGN ORIENT

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MAE 184 Assembly 6 Assembly Constraints: Assembly Constraints: Mate Mate MATE COINCIDENT (or just MATE) Two planar surfaces or datums become coplanar and face in opposite directions. When using datums, you must specify either the yellow or red side. This constrains 3 degrees of freedom. Can you think what they are? There are still 3 unconstrained degrees of freedom (what are they?).
MAE 184 Assembly 7 Assembly Constraints: Assembly Constraints: Mate Offset Mate Offset MATE OFFSET Two planar surfaces or datums are made parallel, with a specified offset, and face in opposite directions. The offset can be negative, and can be used in assembly relations to automatically change the distance between the surfaces. What degrees of freedom does this constraint fix? Which ones are still free?

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MAE 184 Assembly 8 Assembly Constraints: Assembly Constraints: Align Align ALIGN This can be applied to planar surfaces datums, revolved surfaces and axes. Planar surfaces become coplanar and face in the same direction.
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MAE184_Assembly - MAE 184 MAE Assembly Fundementals Content...

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