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FLEXO Magazine : April 2014
a cost/benefit that makes sense. OEE data is only meaningful in the context of a given situation and the efforts to improve it. How do you determine the Ideal Cycle Time or Ideal Run Rate of a machine or process? The simple answer is the Nameplate Capacity—the stated capacity given by the manufacturer or engineer. But like the speedometer in a car, this number may only be an approximation and may vary considerably with machine age and other circumstances. Ideally you should experiment, take measurements and come up with a unique number. How do you define whether a machine is “producing”? If the machine is producing anything at all, the production clock is running. Even if a machine is not producing, if production is planned, the production clock is running. How do you minimize number crunch- ing, spreadsheets and reports and make OEE simple? Data isn’t very useful if it isn’t seen until tomorrow, or at next week’s production meeting. The printout in the manager’s office isn’t nearly as helpful as having real time data, with visual cues, already digested into a form that is useful to you and your operators. Automate the OEE data collection and calculation process, and spend time dealing with the issues that impact productivity here and now. What period of time do you use for an OEE calculation? You can choose any period. Most com- monly, it’s based on the working cycle of the plant, i.e . one shift (8 hours or 480 minutes). Other time frames include one day, one job or even continuous monitoring. Is it possible to have processes that exceed 100 percent? No. If you obtain readings greater than 100 percent, then at some point of the process things are not being defined correctly. It means process capacity was underestimated when parameters were input. If there are several interpretations for the cause of a problem, where do you start? Always look for the simplest and most direct explanation (the root cause). Ob- viously there are exceptions, but here’s what’s important: Rather than ponder and discuss 50 different causes, start with the most straightforward hypothe- sis and test it. Use a process of elimina- tion until you are certain the root cause has been reached. Committed to increasing your productivity and profitability Contacts Xymid, LLC • 5141 Craig Rath Blvd. • Midlothian, VA 23112 fax 804-744-5331 • flexoprintsleeves.com UltraFlex Thin Sleeves DuraRound Thick Sleeves AccuMount Bridge Mandrels ProTek Anilox Covers Crystal Bray Customer Ser vice Rep. ph. 804-744 -5229 firstname.lastname@example.org Jeff Moore Regional Sales Manager ph. 704-948-4648 email@example.com 34 FLEXO APRIL 2014 www.flexography.org