Dickeson--Lift, Pull and Other Dirty WordsNovember 1998
Before expecting a digital solution from a computer, let's think a moment. We know that computer programs still haven't found a practical solution to the classic salesman's routing problem. Ten or 15 years ago the Russians trumpeted that one of their scientists had developed a mathematical formula to handle the problem. Alas, it didn't work.
A computer program can handle a rover on Mars, but last I heard it can't figure the optimum route for the salesperson to follow next week in 12 cities at 12 different appointment times. Maybe some day, but not yet. Compared to scheduling forms and jobs in a commercial printing plant, routing a salesperson would be duck soup!
Brain vs. Box
Scheduling in printing must be done in the neural synapses of the human brain. The scheduling problem in the printing plant is impossibly dynamic—constantly shifting and changing—those infernal clusters constantly dancing around. A schedule solution for 8 o'clock won't work at 9 o'clock. It requires more compromises in a day than a Washington senator makes in a six-year term in office.
So, what shall we do to minimize lifts? Employ a smart scheduler who can use experience, common sense, judgment, an old-fashioned schedule board and a good production-center loading system. Merlin Inc. can provide computer software for work center loading. (This may be called a scheduling system, but it's really a loading system.)
There are some good ones available. In addition, provide some slack time and use it for maintenance tasks if it doesn't get filled by problems. Improve customer communications.
Give serious consideration to production standards that are "ranges" rather than some kind of average. It's much more realistic to say, "This form will require between five and seven hours of presstime," rather than an unrealistic "5.6 hours." Let your computer give you standard deviations. Those little motherboards are so happy when you let them do that!
And this above all: Cherish your schedulers—give them support. When's the last time you gave a scheduler a "high five"? They work against incredible odds. The wrath of sales, marketing, every production department and the controller is visited upon the schedulers. It's the most gut-wrenching, thankless job in the plant.
Every time we pull a job—lift a form before complete—to meet some delivery schedule, we hurt ourselves. The buck stops here. The blame is ours. We created it, and only we can fix it.
—Roger V. Dickeson
About the Author
Roger Dickeson is a printing productivity consultant based in The Woodlands, TX. He can be reached via fax at (281) 419-8213 or e-mail at email@example.com.