Shine a Light on the Problem
The Corporate Quality Manager of a suspended ceiling manufacturer had a problem. When he wanted to check for defects on ceiling tiles, he had them shipped from the manufacturing plant and installed in ceiling grid in the corporate testing facility. This 12’ x 24’ ceiling grid configuration was adjacent to a large bank of windows. He then waited for the weather to cooperate. You see, he wanted the proper angle of sunlight to shine across the face of the tiles, and depending on the time of year and weather conditions, he might have to wait weeks to assess the quality of the tiles. The windows were often obstructed with testing materials, which made access and viewing even more difficult.
The ceiling manufacturer was about to introduce a large quantity of new products and the installation setup would not be sufficient to check all the new products’ quality prior to product launch. A change had to be made. As Lean Champion for the company, my help was enlisted to solve the problem. After some initial discussions and a tour of the area, the Quality Manager and I agreed we needed to think differently about the setup and process of quality testing. We decided to use a Kaizen event to optimize the design of the required testing space.
We assembled a team of testing technicians, quality technicians, scientists, and marketing representatives to think through the testing requirements and systems to install. We also identified a space to use for the new quality testing area. After a few weeks of touring various buildings and negotiating for space, we chose two adjoining 20’ x 50’ spaces on the ground floor of the testing facility. These spaces were filled with equipment and materials from many years of testing and development. We were sure we would be able to remove most of it and re-purpose the space for the benefit of the company. Although these spaces were large, they had no windows to the outside, so we would have to figure out another way to provide proper lighting to the face of the ceiling tiles.
On the first day of the Kaizen, we reviewed Lean principles and spent extra time on 5S. Next, we took the team on a walk of the current testing area and then to the identified spaces. Their first reaction was surprise and disappointment. They thought we should use the existing space by the outside window and reorganize materials and tools.
Our goal was to be able to assess tiles for quality at any time, regardless of the weather. This goal forced us to rule out the current location for testing. In the new space, the clutter got in the way of the team’s vision of what was possible. So, we did the first S, “Sort”. During Sort, the team removed 90 percent of what was in the space. Some equipment, which had been purchased to provide critical data in years past, was no longer useful, and was removed. The team contacted as many of the equipment owners as possible, to ensure we wouldn’t throw out anything critical. Everything would be removed from the space, no matter what.
Once we cleared out the space, we developed our concept for testing. The idea was to create a number of testing spaces, or pods, in which to install and check various types of ceiling tiles. These tiles needed to be at least seven feet off of the floor, so that they could be observed from below as well as from the side, using some form of raking light. The light had to go across the painted face of the tile, so defects and inconsistencies would be readily apparent. The team agreed the size of each pod should be 12’ x 12’. This allowed us to create three pods in each 20’ x 50’ space, for a total of six. We now had three times the capacity of the existing testing space. But, how were we going to create the necessary lighting?
The first thing we had to do was to identify the intensity and angle of light we needed. Fortunately, we were able to do so on the second day of the Kaizen, as the sun came out and provided the necessary lighting required in the existing testing space. Using light meters and the experience of the team, we identified the proper number of lumens (intensity) and optimal angle for the light in the pods.
The next step was to build the ceiling grid configurations in the pods. We put together three installations of ceiling grid in one of the two rooms. Each was squared up and then ceiling tiles were installed. We made sure we had enough space on all sides of the installations, so we could view the tiles from any angle, without obstruction.
Now it was time to go shopping. We purchased enough lights for one of the pods, before committing to all six. We bought a number of different fluorescent lighting configurations (and kept the receipts) to allow us to test and identify the optimal configuration.
On the morning of the third day, we performed our first lighting tests in one of the pods. A technician climbed a scaffold and held one of the lights up to the ceiling tile installation. The team wasn’t pleased. They asked him to move the light a little further away and a little higher. Things started to look better. Then, after a slight adjustment in location and height, they felt they were getting the type of lighting required. Using light meters, they verified a consistent result compared with the natural light measured on day two. The team collected several measurements and developed plans to assemble permanent lighting fixtures for all pods.
Later in the day, the first lighting fixture was installed and the team verified their results. Everything was as expected. Then the team realized an opportunity to provide the same lighting at a 90-degree angle to the original light fixture. They would just need to install an additional fixture and connect it at right angles to the original fixture. This gave them additional inspection capability they never had before.
On the fourth day, the first pod was complete and plans were made to install the same lighting in the other five pods and to hard-wire everything to make it as safe and efficient as possible. Now the team had a new problem. With the extreme increase in productivity and complete elimination of wait time to test, everyone would want to use the pods at the same time.
The solution was to designate an owner for the area and a system to ensure the area was well-managed and organized. To reserve the use of a testing pod, a white board was installed to make reservations visible, by pod. If someone used a pod longer than the requested time, the area owner would follow-up and hold them accountable to honor their commitments.
At the report out, the team proudly reported on their results. They were able to take a process that used to take weeks and reduced it down to minutes. They also increased the capacity of the area by a factor of three. Anyone could now use the pods safely and productively and testing would no longer slow down any new product development or testing project. In the next six weeks, all lights and wiring were installed, and the space has been in continuous use for years.
The team learned how to shine a light on the problem and solve it creatively.