9 - STRONG
3 - MEDIUM
1 - WEAK
OPERATION Easy to close
Stays open on a hill
Easy to open
Doesn't kick back
Doesn't leak in heavy rain
No road noise
No wind noise
Easy to clean
What Is Its Purpose?
To join components, formless material, and
sub-assemblies into a Complex Product
1) Movement between parts is required
2) Different material needed
D a te
Au g1 9 1 3
Con cu rren tE n gin eerin g
Au g2 1 1 3
Au g2 6 1 3
Con strain ts/Man u factu rin g
How can we estimate population parameters from a
Given a large enough set of
observations, we can look at the distribution of values.
Frequency Distribution of Data
Cumulative Frequency Distribution
Measures of Centr
ME 557 Design for Manufacturability
Statistics Review Problems
The diameters of a batch of ball bearings are known to follow
normal distribution with a mean 4.0 in and a standard
deviation 0.1 in. If a ball bearing is chosen randomly, find the
Probability deals with the laws of chance which govern
the occurrence of random events.
the probability that an event A will occur
P(A) = 0 A is an impossibility
P(A) = 1 A is a certainty
P(A) = number of ways in N that pro
DIMENSIONING ENGINEERING DRAWINGS
Engineering Drawings are used to convey shape
Types of Drawings:
- Detail drawing: typically provides 3 views with
dimensions, and material and surface finish data.
- Assembly drawing: provides the relative
DESIGN FOR MANUFACTURABILITY
What: Integrating product design with
downstream production issues
Lower production cost
Quicker time to market
When: Product concept through product disposal
SHOULD BE DONE ROUTINELY!
QUALITY FUNCTION DEPLOYMENT
Translate the customer wishes into the design of a
Utilizes the House of Quality.
Targets what needs to be designed first; versus how
the design will look and work.
Advantages of QFD:
- Preserves knowledge
- Fewer star
IMPORTANCE OF DESIGN IN DFM
By the time the design is finished less than 10% of
the product cost has been spent yet 80% of the cost
has been committed!
WHAT IS DESIGN?
DESIGN is the PROCESS by which PLANS are
prepared for PRODUCTS to satisfy the NEEDS of