Pieces written after sitting with work-order files, oil sheets, and arguments about when a line can actually stop. They are for planners and millwrights, not for a general business audience.
An average interval looks calm on a slide and hides the machine that fails every time a certain grade runs. Mixed-age lines make the average almost rude. The timeline is slower to draw and harder to argue with.
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Spare lead times do not respect the holiday window operations already promised to a customer. Drawing the wait across the outage hours is unkind to the calendar and kinder than finding the empty cage at dawn.
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A ‘watch’ on a route sheet and a rise in iron on a lab page can describe the same housing — or two different arguments. Reading them on the same morning changes what you ask the millwright to open.
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A drawer of tickets is not a rumour and not a complete history. Here is what two seasons of paper usually contain, and which gaps you should refuse to paper over with a confident line on a chart.
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