Case: Process stability T 59
Introduction
How to check the stability of a process (which tool to use)
Scope: production company
Target group: Quality manager, quality technician, production manager, project leader, area manager, team leader
Situation
In the company Nicetoy, Mr. Thenose, quality manager, asks the team leader, Mr Theleg, to give him the amount to produce and nonconformities per hour on the MX2 machine that morning.
At half past twelve, Mr. Theleg presents a table with the following figures:
|
hour |
quantity |
nonconformities |
|
7.00 - 8.00 |
1000 |
11 |
|
8.00 - 9.00 |
2000 |
21 |
|
9.00 - 10.00 |
1500 |
16 |
|
10.15 - 11.15 |
350 |
12 |
|
11.15 - 12.15 |
250 |
9 |
|
total |
5100 |
69 |
Challenge
Mr. Thenose must check whether the process is stable.
What is the simplest tool to check the stability of the process?
1. Scatter diagram
2. Control chart
3. Pareto chart
4. Check sheet