# Obtaining Various Shapes of Machined Surface Using a Tool with a Multi-Insert Cutting Edge
These tools are made from several profile cutters assembled together to form one profile. Changing the shape of the cutting-edge profile of these cutters requires the replacement of individual cutting sections of the tool. It makes sense, in the high-volume machining of objects with rectilinear outline shapes, to use specially designed cutters. For example, form-milling cutters with multiple inserts were used to manufacture screw rotors in [29]. Profile cutters are manufactured using classical methods: rough cutting, followed by machining, and grinding for finishing [30; 31; 32; 33; 34; 35]. However, efficient approaches are needed to reduce the manufacturing time of profile form tools and their costs, to meet the current industrial requirements for low-carbon, energy-saving production. [PERSON] [36] applied a computer-assisted system for the rapid production of form-edge cutting tools, using carbide tool materials. In this system, an electro-discharge machining (EDM) process was used for cutting edge shaping. Starting with a CAD model of the workpiece surface, the desired surface geometries of the rake and clearance surfaces were computed along the outline surface of the form tool edge. The form tool edge geometry is using in the EDM process for G-code control file generation. [PERSON] and [PERSON] [17] proposed a novel design for a generic multi-profile form milling cutter for machining various complex surfaces with reduced machining time and high accuracy. They described a mathematical model that applied non-uniform rational B-spline curve(s) and sweep surfaces to control the shape of the cutting flutes of the generic multi-profile form milling cutter. Further optimum rake angles of the profile cutter were guaranteedby the geometric mapping relationship of the screw coordinate system. It generated a milling cutter coordinate system, using the coordinate transformation theory in a graphic software package authored by [9]. Form tools produced by conventional techniques are relatively expensive and time-consuming to manufacture. A strong disadvantage of the commonly used forming tools mentioned above is the fixed shape of their cutting edges that limits their use to a single surface. Furthermore, in some areas, e.g., in the furniture industry, there are demands for efficient manufacturing methods, to produce complex profiles with different patterns [36; 37]. The application of profiled rotary tools with current solutions means that, in the majority of cases, large numbers of tools are necessary to manufacture a wide variety of patterns [38]. Multi-insert tools can be an interesting alternative in many branches in the manufacturing of brittle materials [39]. Special tools can improve the whole cutting process, reducing cutting time [40; 41]. Prime Turning(tm) [41] is a new methodology that enables one to perform turning in all directions in a much more efficient and productive (>50%) way as compared to conventional turning. This concept is comprised of a new turning method, dedicated CoroTurn(r) Prime tools, and a code generator. This methodology enables the use of longer lasting inserts and higher metal removal rate that translate into more parts per run by doubling the speed and feed. CoroPlex(r) MT [40] combines two valuable tool concepts - CoroMill(r) 390 and CoroTurn(r) 107. It can be used in rotary applications as an efficient milling tool or in different settings for external and internal turning using two CoroTurn 107(r) inserts. The idea of universal tools capable of producing various profiles has emerged, in order to reduce the number of tools, thereby meeting current industrial requirements for material and energy savings [42; 43]. This functional aspect of the universal tool turns it into a multi-insert instrument with replaceable cutting edges. Each cutting-edge element produces only a part of the entire profile. The range of functions can produce a large number of profiles with a limited number of simple cutting-edge profiles.