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Lesson 1
Statistical Process Control Concepts |
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Lesson 3
Attributes
SPC Control Charts |
Purposes
and Value of SPC
Quality
Characteristics
Variables
Attributes
Histograms
The Normal Distribution
Mean/Average
Standard Deviation/Range/Spread
Examples and Exercises
Charting Data Over Time
Deming's 14 points
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Conformance
to Specifications
Nonconformities/defects
Nonconforming/defective
Types of Attributes Charts -- Decision Tree
p Chart:
(%) of nonconforming units
Variable subgroup sizes OK
Need large enough sample size to find
nonconforming units
Creating a p chart
np Chart:
Number of nonconforming units
Needs constant subgroup size
Creating an np chart
c Chart:
Number of nonconformities per
subgroup
Can be any unit of production
Need constant subgroup size
Creating a c chartu Chart:
Number of nonconformities per
unit
Can be any unit of production
Variable subgroup size OK
Creating a u chart
Examples and Exercises
Analyzing Attributes Charts for Suggested Actions
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Lesson 2
Variables
SPC Control Charts |
Application
of the Central Limit Theorem
Components of a Control Chart
Rational subgroups, "within" variation, and "between" variation
X-bar, R Calculations
Control Limits
Analyzing SPC Charts for Patterns of Variation
Natural Patterns
Unatural Patterns
Outliers
Runs
Trends
Sudden change in level
Others (Western Electric Rules)
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Responding to Chart Signals
What to Do
What Not to Do
Creating and Plotting SPC Charts
Filling out top of chart
Entering subgroup sample data
Calculating X-bar and R values
Plotting X-bar and R values
Control vs. Capability
Determining Process Capability
Conditions/Assumptions for
Determining Capability
The Process Capability Indices (Cp and
Cpk; Cpm; Ppk)
Identifying the Need for Corrective
Action and Process Capability
Improvement (Variation Reduction)
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Lesson 4
Other Types of SPC Control Charts |
Variations
of Conventional Control Charts
X-bar, S Chart; Median Chart
IX, MR Chart
Target X-bar, R Chart
Target IX-MR Chart
Proportional Chart
Group Charts
3D X-bar, R Chart
Charts for Processes with Predictable Trends
Short-Run X-bar, R Chart
Short-Run Group Charts
Short-Run Attributes Charts |
