A table saw includes a base assembly having a base structure and side walls, a table top assembly top surface, and an undercarriage assembly including a motor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. The lubricating media may collect in the collection area to a static level when the pumping system is off and to a dynamic level when the pumping system is on.