j & r machining is a family owned and operated business located in southeast tennessee. i, jim koper grew up in my fathers fabrication shop in michigan and have been running machines since the age of 12. trained in plastic injection mold building, i have worked in the tool and die industry for 15 years. here at j & r machining we strive to provide quality service at a reasonable price. we specialize in designing and fabricating one of a kind components for automotive and motorcycle customization. we also handle everything from agricultural repairs to precision tooling. lets not forget the metal art work also