Mating condition, Mating feature and interference fit
Mating condition
• Part coordinates MCS (modeling coord.)
• Base part: Datum
• Global CS
• Local CS
• Explicit position and direction vs mating conditions
• 4 x 4 homogeneous transformation matrix
Mating feature
Types: against, fits, contact, coplanar fits: center lines are concentric
• Mating condition = mating type + two faces
• Normal vector + one point on the face
• against: two normal vectors are in against directions
• fits: between two cylinders: center lines are concentric
• Against and fits allows rotation and translation between parts
Interference fit
• Fits is clearance fit
• tight fits is interference fit
• Coplanar: two normal vectors are parallel
• ‘Coplanar’ complements ‘against’
ASSEMBLY MODELING OF PARTS
• Assembly modeling is a combination of two or more components using parametric relationships.
• Typically a designer would start with a base part
• Add other components to the base part using merge commands.
Assembly modeling is a technology and method used by computer-aided design and product visualization computer software systems to handle multiple files that represent components within a product. The components within an assembly are represented as solid or surface models.
