THE ECONOMIC EQUATION FOR ROTARY DRAW BENDING RELATES THE VARIABLES OF MACHINE, TOOLS, OPERATOR, MATERIAL, AND LUBRICATION AND THEIR EFFECT OF THE QUALITY OF THE BENT TUBE AS WELL AS THE ECONOMIC IMPACT ON THE BENDING OPERATION. EACH VARIABLE IS INTERDEPENDENT ON THE OTHERS AND MUST BE UNDERSTOOD IN THIS OVERALL CONTEXT. THE MACHINE AND CONTROL MAKE UP THE INITIAL INVESTMENT AND THE SAME MANUFACTURING CONCERN NEEDS TO BE APPLIED IN SELECTING THE MACHINE. THE MACHINE FACTORS OF SPEED, RELIABILITY, DEPENDABILITY, AND ADAPTABILITY ROUND-OUT THE EQUATION FOR AN ECONOMICAL TUBE BENDING OPERATION.