Was involved in the installation and commisioning of a $13M, 9 machine, automated machining cell. It was running perfectly when the "powers that be" came out to look at their expensive new toy. Just prior to them coming out to the cell, the thing went nuts-all kinds of errors, machine shutdowns, alarms, finally complete system shutdown. Ceremony was postponed while we tried to find problem. Turned out that the "in process/real time" information was coupled out of each machine by an optical system. Just prior to the "dog and pony" show, a well-intentioned janitor had made a pass through the area with a ride-on floor sweeper that had two safety strobes on it. It had apparently "glitched" the communication system to the point that nothing knew where it was, and the cell supervisory computer "failed safe" by shutting down. Cleared and reset entire system and it ran perfectly again. Were able to reproduce error a couple times to verify suspicions. Immediate, panic driven, low cost FEF (Field Expedient Fix) was to install a couple of coffee cups over the strobe lights of the sweeper when it was in that area.
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Today's Featured Article - Show Coverage: The Old Gold National Antique Tractor Show - by Cindy Ladage. Over the fourth of July weekend, the Illinois State Fairgrounds in Springfield, Illinois, was the site of the Old Gold National Antique Tractor Show. Tractors of all makes and models were displayed and separted into categories by their age. Deere, Oliver and even a Wards and Keck Gonerman were part of the crowd. A sea of red International Harvester's seemed to be the the model with the biggest showing. The crowd was decent for the scorching July heat. The opening day started o
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