|
What is Six Sigma ?
An Explanation of Six Sigma Goals and
Processes
Developed and championed by Motorola engineers in the 1980's, Six Sigma
is an attempt to increase traditional quality levels from measuring defects
per thousands to measuring defects per millions.
Six Sigma methodology addresses variability in design, production, services,
processes and measurement. Decreasing a process's variability increases
control and predictability of the process, resulting in increased quality,
reliability and performance, while reducing cost. There are four main sources
of process variation:
-
Poor design resulting from bad design practices, unrealistic or
unclear requirements and requirement shift and creep
-
Variation in a manufacturing process due to varying manpower levels,
work methods and ethics, environmental factors, training and machine wear
-
Variation in measurement systems due to improper calibration and
implementation
-
Variation in parts and supplies from venders and subcontractors
The name Six Sigma refers to the six standard deviations in process's normal
distribution. Like groupings on target, Six Sigma's goal is a process centered
within a specification and having very little variation, as shown in Figure
1.
|
|
|
Scattered
|
Centered with High Variation
|
|
|
|
Off-Center with Low Variation
|
Centered with Low Variation
|
-
Figure 1. - Process Distributions
As a team project, Six Sigma has five phases:
-
Design - In the Design Phase, the team identifies the problem and
project scope.
-
Measurement - In the Measurement Phase, the team identifies critical
characteristics, maps the value stream and validates a measurement system.
-
Analysis - In the Analysis Phase, the team determines the current
process capability and causal relationships in the process and identifies
variability.
-
Improvement - In the Improvement Phase, the team conducts experiments
, identifies variable relationships and takes corrective action.
-
Control - In the Control Phase, the team monitors performance, determines
the new process's capability and analyzes the process to identify and eliminate
potential mistake activities.
This Six Sigma process is commonly referred to by its acronym
DMAIC.
Build a Statistical Catapult in just one night with TrebuchetStore.com
catapult plans and instructions.
Great Project
The Statistical Catapult provides a valuable, cost-effective addition
to your classroom or corporate training program. It works wonderfully for
class assignments, teambuilding exercises and science fair projects.
Professional Design
Professionally engineered, the Statistical Catapult allows you control
of up to four independent variables for a wide range of educational and
experimental applications in business, mathematics, science and engineering
including:
-
Causal Relationships
-
Statistics
-
Parameter Control
-
Taguchi methods
-
Six Sigma
-
LEAN Manufacturing
-
Quality Control
-
Manufacturing Design
|
-
Process Control and Improvement
-
Product Design and Development
-
Problem Recognition and Solving
-
Data Collection and Graphing
-
System Modeling and Simulation
-
Ballistics and Projectile Motion
-
Science and Math Projects
-
Design of Experiments
|
Easy to Build
All TrebuchetStore.com plans use common, inexpensive and easy to find
building materials, available at your local hardware store or home center.
Basic skills and tools are required, but the straightforward designs require
no complicated layout or joinery.
TrebuchetStore.com plans come complete with:
-
Parts Shopping List
-
Measured Drawings for all parts
-
Assembly Drawings
-
Step by step Assembly Instructions
-
Step by step Firing and Tuning Instructions
All the information you need to complete your project quickly and easily.
TrebuchetStore.com Plans and Instructions take the mystery out of catapult
design and construction.
Purchase of TrebuchetStore.com
Plans grants the customer a single license for personal, non-business use.
TrebuchetStore.com products are protected by United States Copyright Law.
You may not modify, duplicate, sell, rent, lease, loan, distribute or create
derivative works based on information provided in whole or in part. Please
read the complete License Agreement. |
