Manufacturers serious about improving OEE need to invest in automated data collection. Though the intention of manual data collection is good, this approach doesn’t provide real-time insight or the level of accuracy and detail that an automated data collection can produce. Perhaps more importantly, automated data collection helps you shift employees’ attention to high-value work like running machines and solving problems that hinder operational performance.
“It’s a sign of respect to give employees meaningful work” is a common theme among Lean practitioners. I assert that manual downtime collection is most often not meaningful work and in fact can be a de-motivating task for employees. This is unfortunate, as the intention is good — if no one understands downtime, the company can’t properly address it. At best, manual downtime collection paints a high-level picture and provides rudimentary data. At its worst, it can create a very misleading perception of how equipment is performing.
When there’s no automated data collection, companies rely on manual processes, sometimes using a paper log. This method is cumbersome and does not provide the data required to improve OEE.
Since manual data collection is tedious (and often provides little value), I have seen many instances of “pencil whipping” the downtime report at the end of the shift. In this scenario, the experienced line lead reviews the shift output and does some mental math to determine how many minutes of downtime needs to be accounted for. He then thinks back about the issues during the shift and distributes the requisite minutes of downtime in the log. While manual data collection is a poor use of time for one of the most valuable employees in the plant, the exercise is rendered useless because it is not based on solid evidence and not taken seriously.
Making things worse, the input isn’t a good foundation for analysis or improvement. The most rudimentary manual systems log downtime on paper at the production line, and slightly more sophisticated methods go into a shared drive. Manually collected data is often handed over to someone in an administrative role who then manipulates it into a usable format. It’s one more time-consuming activity that doesn’t provide real-time insight.
These and other pitfalls associated with manual data collection mean that operations leaders and continuous improvement specialists don’t have accurate insight regarding production rates.
Manual downtime tracking implies few downtime occurrences throughout a shift, and further provides no information about line slowdowns, post-changeover ramp-up timing, or other performance erosion. It creates an inaccurate perception of uptime and downtime — in reality, the line isn’t as stable as the data indicates.
Automated data collection reveals much more instability and that the production line has:
Ultimately, manual data collection isn’t worth the paper used to capture it.
The cost to implement an automated OEE system has decreased significantly over the years. Manufacturers have pushed machine OEMs to produce equipment that provides productivity data. In addition, many now provide adapters for older machines. Even without built-in connectivity, inexpensive data collection devices can be installed to provide the signals required for automatic OEE data collection.
On the OEE platform side, off-the-shelf systems now come with substantial “out of the box” functionality, eliminating the need for custom programming. All of this is good news — manufacturing companies can expect faster implementation and much less capital investment than just a few years ago. In addition, this investment can support other initiatives such as predictive quality or predictive maintenance, making the investment even more valuable to the organization.
The first step for any organization with manual data collection OEE tracking is have frank conversations to understand how much stock the team puts in the existing data. The next step is to determine the business benefit of improving capacity utilization — articulate the value in terms of increased revenue or decreased costs, what can you achieve as you free up capacity?
There are countless case studies from many industries to help justify automated data collection and they almost always show how:
If your company has delayed automated data collection, find out why. Then gather your analysis and the team to show how automated data collection supports achieving business goals. Everyone — from your line leaders all the way to the CEO — will thank you for driving the business to automated data collection which is foundational for OEE improvement.