Process Control

Question 1

Variability

Answer 1

Is the tendency of something to change it a lack of regular pattern

Question 2

Variation

Answer 2

Is a change or difference in the properties of something

Question 3

Process

Answer 3

Set of actions that transform our input into output

Question 4

Specification

Answer 4

Defined parameters of the product characteristics. Clearly defined parameters are key to making a consistent product.

Question 5

Target

Answer 5

The desired value of the process parameter eg. Temperature or percentage moisture.

Question 6

Range

Answer 6

All processes have a degree of acceptable variation: upper and lower specification limits (USL,LSL)

Question 7

Run chart/control chart

Answer 7

A graph used to study process changes over time. Results are plotted over time with the USL &LSL, and target vales specified.
- only constructed once the process is reasonably under control.

Question 8

USL, LSL

Answer 8

Upper specification limit, lower specification limit. Set by operator.

Question 9

Statistical process contol

Answer 9

To use simple tools to improve the process until it is well within specification. Know as process “capability”

Question 10

Process capability

Answer 10

Is the ability of a manufacturing process to consistently make products within a specification. This specification is set by the manufacturing company to reflect the needs of the customer.

Question 11

UCL, LCL

Answer 11

Upper control limit, lower control limit. Calculated limits based on the standard deviation info from process data. Give limits and expectations.

Question 12

UWL, LWL

Answer 12

Upper warning limit, lower warning limit. Shows when results are trending out of spec.