Maintenance-
Maintenance has been a World Wide problem since the end of WWII. Most companies have lost interest and run production shops wide-open with no maintenance schedules or down time built into production schedules. Of the ones who do, it normally occurs at the biggening of the production day or at shift change without simple studies pertaining to when and why best scheduled. There are at least 50 variable to measure. Heat impact, time of day heat has greatest impact, lack of machine observation, lack of oil or hydraulic fluid observation or change, etc. I will not provide a complete Picquet List of variables. At least half should be common sense if you do any form of equipment obsolescence /replacement planning. SEMITECH looked at this in the 1990s to make it a required line in OSHA process books. It never took and remains the largest reason for shop accidents, product error, and unscheduled product production down time. Production managers tend to blame people for those problems not process or machine maintenance.
--Systems Integration Engineer - R&D Fabricator
1moKudos to you!