C.I. Hayes Inc., Cranston, R.I., built and installed a continuous vacuum pressure quench vacuum furnace including fully automated PLC controls and enhanced cooling designs at a captive heat treater. The furnace has a 3-tray hot zone and a 170 lb gross tray capacity. It is designed to process one tray every 15 minutes. The control panel contains a PLC control system and proprietary programming logic. The furnace will be used to heat treat reciprocating, jig and hack saw blades made of carbon steel, bimetal steel and high-speed materials.