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FLEXO Magazine : April 2014
Should preventative maintenance downtime be allowed to penalize an OEE calculation? If the preventative maintenance happens during Planned Production Time (rather than during Planned Shutdown), then it is interfering with production and should be counted. This does not mean that you should not do preventative maintenance at that time; it only means that over time, OEE will tell you whether this mainte- nance results in less overall Downtime, because of fewer “surprises,” or more Downtime, because of the lost productiv- ity while maintenance is done. This is an example of how OEE can give solid an- swers to complex questions by attaching them to simple measurements. Should reworked pieces be counted as Good or Reject in the OEE calculation? In OEE, any part that doesn’t come out right the first time is a Reject Piece. It’s a production issue that needs to be addressed. Your strategy for improving original part quality vs. reworking reject parts is a separate management and financial issue. How can reworked pieces be counted in an OEE calculation? Reworked pieces are typically looked at as a completely independent OEE pro- cess. It takes into consideration that time and materials were used in the first pass run that resulted in a product that did not meet quality standards but where a part of some value exists. Where the original Ideal Cycle Time may have been 180 seconds, a rework Ideal Cycle Time may be only 26 seconds, for example. If a process can run during scheduled breaks, then is that break time fac- tored into equipment availability? A personnel break is not necessarily the same as a process break. If the process is expected to be running—producing anything—then regardless of whoever is or isn’t eating lunch, OEE considers the time to be part of planned produc- tion. On the other hand, in a multiple operator non automated process, a different Ideal Run Rate may be appli- cable during the break. n About the Author: Vorne Industries Inc. has been working for more than 30 years to deliver the best, field proven industrial automa- tion products avail- able. During this time, the company has evolved to meet and antici- pate ever changing needs by listening and responding to customers with well engineered, well thought out solutions to real world prob- lems. Vorne also provides Visual OEE, a display that tracks various relevant measurements in real time. Learn more at www.vorne.com and www.oee.com. The Fast Guide to OEETM Presented by Vorne Industries Specialists in Visual Factory and Production Monitoring Systems ©2002-2008VorneIndustriesInc., Itasca,ILUSA +1(630)875-3600 www.vorne.com www.oee.com 36 FLEXO APRIL 2014 www.flexography.org firstname.lastname@example.org · www.vetaphone.com 101 reasons to choose Vetaphone CORONA & PLASMA 101 Booth #1316 See the other 98 reasons on our website #14 Easy Cleaning & Maintenance #14 #25 Quick Change Cartridge #25 #39 Humidity Resistant #39