Chapter: Mechanical : Computer Aided Design : Assembly of Parts

Mating condition, Mating feature and interference fit

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.

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.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Mechanical : Computer Aided Design : Assembly of Parts : Mating condition, Mating feature and interference fit |