This paper evaluates whether Wi-Fi sensing using CSI can detect NC milling machine tools' machining status and other operations without contact sensors. Since the transmission path of Wi-Fi communication changes slightly due to equipment vibrations, the CSI data changes depending on the NC machine tool's operation. We evaluate whether the NC machine tool's operation status can be estimated from these changes. Experiments conducted by changing the operating conditions and cutting materials showed that NC milling machines' operating and machining conditions could be estimated using CSI.
