Adige S.p.A., part of the enterprise group BLMGroup, manufactures laser-cutting machines. These machines are complex, their maintenance, in particular, requires advanced expertise. With the goal of reorganizing the knowledge management strategy of maintenance expertise, the company investigates semantic technologies in the OntoCommons project with the collaboration of the Laboratory for Applied Ontology (CNR-ISTC). The expected results are, among others, a decrease in the time required to solve previously encountered problems and an increment in the information that can be extracted from maintenance records. The resulting efforts produced ontologies containing domain terms, as well as methodological guidelines for functional and structural modeling of engineering systems, and failure analysis.