Mechanical Assembly Design

A method of development where considerations are made to simplify the manufacturing process or processes and to lessen the time and cost needed to create a product.

• Design for Assembly (DFA)
• Design for Manufacturability (DFM)
• Mechanical Assembly
• Interference Fits

A type of standard fit based on inch units. Most commonly used in the US.

• ANSI Fits
• ISO Fits
• Snap Fits
• If the shoe fits

An assembly method where mating parts have a temporary interference during assembly, but once assembled they interlock with some level of clearance or less interference.

• Snap Fits
• ISO Fits
• ANSI Fits
• Snap Ring

A method of development where considerations are made to simplify assembly and disassembly.

• Design for Assembly (DFA)
• Design for Manufacturability (DFM)
• Mechanical Assembly
• Bearings

Common Mating conditions in Part Assembly are:

• Coincident

• Concentric

• Checkmate

• Touch move

How do we know that out CAD product model may be under-mate or over-mate?

• Mass Property Analysis

• Finite Element Analysis

• Clash and Sectioning features

• Motion analysis

Analysis of the motions of mechanisms and the

effects of mass is the definition of ......................

Below are type of analysis can be done with the assembly model, EXCEPT:

• Tolerance analysis

• Kinematic analysis

• Dynamic analysis

• Treatment analysis

Two type of techniques in doing Assembly are:

• Top-down Assembly

• Bottom-up Assembly

• Left-right Assembly

• Skew-up Assembly

What is the major issue to properly plan a proper assembly technique?

• COST!!

• TIME

• Operator handling

• Production set-up