On-site machining, Preheat and PWHT services, Field machining services, cnc prototype & production work, General machine shop Machine design & Manufacturer Performance Machining Inc. is a diverse company serving a variety of industries. We are capable of handling all of your field machining, stress relieving / PWHT. Our portable equipment, dedicated engineers and highly trained machinists enable us to meet all of your machining, and stress relieving needs at your location saving you downtime and money. In most cases it is not necessary to tear down your equipment we are able to machine it as it is.