Experimental analysis and FEM modelling of a cutting tool vibrations

Presented in this paper is a comparative analysis of vibrations, measured during machining process and modelled by FEM. Moreover, microscopic structure of chip cross section was analyzed in order to establish the frequency of lamellae generation and its influence on the total level of vibrations of the cutting tool. Based on the results thus obtained, a method was proposed which allows determination of tool wear degree through separation of reliable indicators from the high-frequency spectrum of the measured vibration signals. This investigation showed that the change of chip segmentation frequency significantly influences the output vibration signal within the high-frequency spectrum, and is a function of tool wear degree

Configuring a new educational machine tool based on hybrid kinematic mechanism

U radu je pokazano konfigurisanje nove edukacione mašine na bazi mehanizma sa hibridnom kinematikom. Dat je opis koncepcije troosnog O-X hibridnog mehanizma koji se sastoji od jedne serijske translatorne ose i dvoosnog paralelnog mehanizma koji može da radi u dve varijante, sa opruženim O i ukrštenim X štapovima paralelnog mehanizma. Virtuelni prototip mašine je konfugurisan u CAD/CAM okruženju, gde su izvršene i simulacije rada mehanizma. Oformljen je sistem za programiranje mašine koji omogućava i verifikaciju programa. Za potrebe upravljanja konfigurisan je sistem upravljanja otvorene arhitekture na LinuxCNC platformi. Izvršen je probni rad mašine u cilju verifikacije realizovanog prototipa i upravjlanja.The paper shows the configuration of a new educational machine based on hybrid kinematics mechanism. The concept of a three-axis O-X hybrid mechanism is described, consisting of a single serial translational axis and a two-axis parallel mechanism that can operate in two variants, with extended form O and crossed form X-joints of the parallel mechanism. The virtual prototype of the machine was configured in a CAD/CAM environment, where simulations of the mechanism's operation were performed. A programming system for machine has been prepared that also enables program verification. An open architecture control system based on the LinuxCNC platform has been configured for control of the machine. The trial work of the machine was performed in order to verify the realized prototype and control

Configuring a new educational machine tool based on hybrid kinematic mechanism

U radu je pokazano konfigurisanje nove edukacione mašine na bazi mehanizma sa hibridnom kinematikom. Dat je opis koncepcije troosnog O-X hibridnog mehanizma koji se sastoji od jedne serijske translatorne ose i dvoosnog paralelnog mehanizma koji može da radi u dve varijante, sa opruženim O i ukrštenim X štapovima paralelnog mehanizma. Virtuelni prototip mašine je konfugurisan u CAD/CAM okruženju, gde su izvršene i simulacije rada mehanizma. Oformljen je sistem za programiranje mašine koji omogućava i verifikaciju programa. Za potrebe upravljanja konfigurisan je sistem upravljanja otvorene arhitekture na LinuxCNC platformi. Izvršen je probni rad mašine u cilju verifikacije realizovanog prototipa i upravjlanja.The paper shows the configuration of a new educational machine based on hybrid kinematics mechanism. The concept of a three-axis O-X hybrid mechanism is described, consisting of a single serial translational axis and a two-axis parallel mechanism that can operate in two variants, with extended form O and crossed form X-joints of the parallel mechanism. The virtual prototype of the machine was configured in a CAD/CAM environment, where simulations of the mechanism's operation were performed. A programming system for machine has been prepared that also enables program verification. An open architecture control system based on the LinuxCNC platform has been configured for control of the machine. The trial work of the machine was performed in order to verify the realized prototype and control

Modelling and analysis of machine tool with parallel-serial kinematics based on O-X glide mechanism

Machine tools with a parallel-serial (hybrid) kinematics structures represent a compromise solution that combines the advantages of traditional serial and parallel kinematic in the building of machine tools. By selecting a planar parallel mechanism with optimally designed components, the supporting structure of the machine tool is obtained with improved kinematic and dynamic characteristics in the desired direction with a satisfactory working space. Such solutions are suitable for modern, multifunctional machine tools. The paper describes the original parallel-serial 3-axis O-X mechanism developed for the purpose of building of multifunctional machine tools. The basic feature of the O-X mechanism is a dual kinematic structure that allows the formation of two different workspaces with different characteristics which can be adapted to different applications. The paper presents the first prototype of a machine, developed for the purpose of testing of characteristics with an open control system based on the LinuxCNC

Modelling and analysis of machine tool with parallel-serial kinematics based on O-X glide mechanism

Machine tools with a parallel-serial (hybrid) kinematics structures represent a compromise solution that combines the advantages of traditional serial and parallel kinematic in the building of machine tools. By selecting a planar parallel mechanism with optimally designed components, the supporting structure of the machine tool is obtained with improved kinematic and dynamic characteristics in the desired direction with a satisfactory working space. Such solutions are suitable for modern, multifunctional machine tools. The paper describes the original parallel-serial 3-axis O-X mechanism developed for the purpose of building of multifunctional machine tools. The basic feature of the O-X mechanism is a dual kinematic structure that allows the formation of two different workspaces with different characteristics which can be adapted to different applications. The paper presents the first prototype of a machine, developed for the purpose of testing of characteristics with an open control system based on the LinuxCNC