In the appendix of Reliability-Centered Maintenance II, John Moubray lists 102 proactive maintenance techniques in six categories:
1. Dynamic effects: monitoring of vibration, pulses and acoustic emissions (17 techniques)
2. Particle effects: monitoring of particles in the component’s operating environment, e.g. lubricant (15 techniques)
3. Chemical effects: monitoring of chemical elements in the component’s operating environment, e.g. lubricant (27 techniques)
4. Physical effects: monitoring of surface cracks, fatigue, wear, etc (24 techniques)
5. Temperature effects: thermography (4 techniques)
6. Electrical effects: (15 techniques)
While extensive, Moubray’s list is by no means exhaustive. And new predictive techniques are being devised … continue reading »
Ralph Waldo Emerson once said:
“As to methods there may be a million and then some, but principles are few. The man who grasps principles can successfully select his own methods. The man who tries methods, ignoring principles, is sure to have trouble.”
It’s a pretty astute observation from a poet. That principles are far more important–and powerful, than methods. And when you consider that a lot of troubleshooting is conducted by trial of method, while principles are ignored, it’s not too surprising that the path is often long and torturous, with missteps along the way.
This story from Simon … continue reading »
A hungry donkey enters a barn in search of hay. Much to his delight he discovers two, identical haystacks, each on the opposite side of the barn. The donkey stands in the middle of the barn between the two piles of hay, not knowing which one to choose. Hours go by, and then days, but he still can’t make up his mind. Unable to decide, the donkey starves to death.
This short parable comes from the French logician and philosopher Jean Buridan’s commentaries on Aristotle’s Theory of Action, and so the story is known as ‘Buridan’s Ass’.
When he constructed … continue reading »