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# The former edges are termed the primary mating edges

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Unformatted text preview: 1 and sin(θ)≈θ. For parts whose boundaries consist of line and arc segments, there are six types of distance constraints, with which we can model all contact and clearance specifications: 1. vertex-line; 2. edge-line; 3. arc-line; 4. arc-arc; 5. conditional edge-edge, and; 6. conditional arc-arc. The assembly in Figure 1 has all the six types of constraints. For each constraint type we write in parenthesis the number of degrees of freedom it constrains. 1. vertex-line constraint (1): this constraint is used to describe distance and angle relationships between two linear features. For example, in Figure 1, the flush relationship between the top of parts P6 and P4 is described with a vertex-line constraint between the left vertex of part P6 and the line supporting the upper edge of P4. 2. edge-line constraint (2): this constraint is used to describe a distance relationship between two edges. For example, in Figure 1, the contact relationship between the left edge of P6 and the right edge of P4 is descri...
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## This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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