Study Guide: Product and Process Control Flashcards
Why is it important to identify materials used in producing a product?
Reduce risk
Most effective method of account for and tracking product materials
Radio frequency identification
Acceptance sampling is most appropriate when
Inspection costs are high
Disadvantage of sampling inspection
Reject a lot that conforms due to variability in sampling
Which tool is most appropriate when evaluating a sampling plan?
OC Curve
A company requires a part on a small lot-by-lot basis. On which probability distribution should the OC curve of the sampling plan be based?
Hypergeometric
How does the probability of acceptance change as the sample size increases
Pa Decreases
What has the least effect on the OC Curve?
The lot size
What is AOQL
Maximum average outgoing quality limit
What type of sampling method is most appropriate for destructive testing
Sequential sampling
What is a disadvantage of a single sampling plan?
They do not use tightened inspection
Dodge-Romig tables use the AOQL and LTPD for plan selection. These plans are designed to
Minimize average total inspection
Why is sampling integrity is important?
To ensure a product has not been contaminated during inspection
Used to maintain Sample Integrity
Batch Control
Change Control
Configuration Control
Tool thats used to determine conformance or non-conformance
Gauges
Most common method for surface measurements
Stylus Averaging
Which measurement tool is appropriate for a round shape?
Precision Spindle
What tests tensile strength?
Non-destructive testing
Slight changes in temperature where parts are measured for conformance could lead to:
Random error in measurement
Info on the contribution to error of technicians or a labs procedures can be found in:
Measurement assurance protocols
When measurements are consistently larger than reference value what has occurred:
Systematic error
Goal of calibration is to maintain the systems’ ______
Accuracy
What component contributes to accuracy?
Linearity
The observed average minus the reference value
Bias
Inherent fluctuations in the measurement system
Random Error
Measurement error caused by humans, imprecise measuring devises, or poor methods:
Systematic Error
The accuracy of a measurement system consists of (3)
Gage Bias
Linearity
Stability
Repeatability and reproducibility describe
The precision of the measurement system
Measures how changes in the size of the part being measured affect the bias of the measurement system
Linearity
Variability of the test instrument when used to measure the same part
Repeatability
Variability due to different operators or setups of the measurement system measuring the same part
Reproducibility
This type of chart provides info about special causes of variation related to the gage R&R study
R Chart
