Trust, but Verify

In 2005, I was asked to be part of a team to help Armstrong’s Mobile Alabama ceiling tile plant improve their performance.  Production output had steadily declined over the first few months of the year, and they were well behind budget.  The team was tasked with identifying and implementing improvements to the operation that would drive performance back to budget for the full year. The team leader called the effort a “Full Court Press”, meaning we would not give up until we accomplished our mission.

The Mobile plant had one board forming line and two fabrication and packaging lines. The board forming line was clearly not the problem, as the quality, productivity, and safety were well above budgeted performance. The fabrication and packaging lines were where the losses were occurring, so we agreed to focus our efforts there.

On our first day at Mobile, we attended the morning production meeting. We introduced the team to the staff and reviewed performance. The plant staff members were open to our help, but weren’t sure what we would be able to deliver in a short time. We assured the staff we would do our best and coordinate any efforts through them. Once the meeting ended, we took a tour of the fabrication department. During this tour, we observed many problems and spoke with operators, mechanics, and other staff to get feedback and ideas. Many were disappointed with the performance and hoped we would be able to help them turn things around.

Each of our team members had a specialty. One was interested in the programming used to control the equipment, another was fascinated by the coordination of materials and resources. My area of expertise was flow of materials through the production line. During the tour, I noticed many line-stops and jams. I knew I could provide help.

With the agreement of our team leader, another team member and I took a detailed look at one of the main fabrication lines. This line was led by a technician named Walter. Walter was extremely interested in what we were doing, and asked if he could tour the line with us. We were happy to have him along, as he introduced us to all of the crew members and lent credibility to our efforts. He also appreciated our approach of watching the line carefully to identify the causes of the line-stops and jams.

Something Isn’t Hitting Right

On our tour, we stopped at the punch press to watch its operation. Something didn’t look right to me. The press creates holes in the ceiling tiles which allow air and sound to enter the tile. It’s critical for the ceiling tile to enter and exit the press squarely and centered. Following the press, there’s a gate that stops the tile while the press completes its work. If the tile is angled, the edge of the tile gets damaged when it hits the gate. As I watched the tiles enter and exit the press, I noticed they weren’t exiting the press squarely and hitting the stop-gate at an angle.

I asked the press operator if he was concerned about the tiles hitting the stop gate at an angle. He told us he thought any damage would be cut out later down the line. It looked to me as though the amount of damage wouldn’t cut out completely, but the operator was convinced otherwise. I made notes of what I had seen, and we continued our tour.

Following the press, tiles were being painted and then cut to final size. After the cutting station, tiles went through an inspection station, where two operators were visually checking the quality of each and every one. While we were there, the inspectors were rejecting one-third of the tiles they were inspecting. There was so much scrap being generated they were having a hard time keeping up and had to stop the line many times.

During one line-stop we asked the inspectors what they were seeing. They showed us the broken edges of the tiles. The edges had cracks down the length of the tiles at an angle. They looked just like the angle of the press stop-gate we had seen earlier. I asked the inspectors for a few samples, which they were more than happy to share.

A New Angle on the Situation

We took a walk back to the press with Walter. We showed the press operator the sample ceiling tiles. He was shocked. He didn’t realize the stop-gate was causing so much scrap. He immediately shut the line down to make adjustments.

While the line was down, I asked if I could take a look inside the press to see if there might be a reason the tiles were hitting the gate at an angle. After locking out the press, I took a closer look and was amazed at what I saw. The guide rails in the press were not straight as designed, but curved. These rails were causing the tiles to turn at an angle when they entered the press. All plants had scheduled maintenance to replace press guide rails every six months. When I asked the press operator when the last time the rails had been changed, he didn’t remember, but thought it had been years. I then asked if they had backup press guide rails in their storeroom. Luckily, they did. Even luckier, they were straight.

Setting Things Straight

We replaced the curvy press guide rails with straight ones, and started up the press. Immediately we stopped the press. We were still damaging the edges of the tiles, this time at a different angle. We quickly identified the problem. The stop-gate was angled for the curvy guide rails and had not been adjusted for straight press guide rails. Once we straightened the stop-gate, the edge damage disappeared. After a few handshakes and high fives, we created a monthly press guide rail inspection and a six-month replacement program for this critical component.

During the week, the team made many other quick improvements and planned out other work that helped the Mobile plant return to budgeted performance for the year. If there’s a lesson to be learned from Armstrong’s Mobile plant, it’s to trust your processes, but verify them on a regular basis. Trust alone cannot eliminate inefficiencies or waste from creeping in, but consistent verification can identify these issues quickly so that they can be corrected.