OBRABOTKAMETALLOV Vol. 26 No. 4 2024 109 EQUIPMENT. INSTRUMENTS Systematics of multi-tool setup on lathe group machines Nizami Yusubov a, *, Heyran Abbasova b Department of Machine Building, Azerbaijan Technical University, 25 H. Cavid avenue, Baku, AZ1073, Azerbaijan a https://orcid.org/0000-0002-6009-9909, nizami.yusubov@aztu.edu.az; b https://orcid.org/0000-0002-0407-5275, abbasova.heyran@aztu.edu.az Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 4 pp. 92–111 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.4-92-111 ART I CLE I NFO Article history: Received: 17 July 2024 Revised: 19 August 2024 Accepted: 17 September 2024 Available online: 15 December 2024 Keywords: Systematics of multi-tool setup Lathe group machines Classifi cation formula for setup Parallel multi-tool machining Single-carriage two-coordinate setups Two-carriage two-coordinate setups Funding This work was supported by the Azerbaijan Science Foundation - Grant № АЕF-MGC-2024-2(50)-16/01/1-M-01. ABSTRACT Introduction. The analysis of factory lathe-automatic operations revealed a signifi cant variety of multi-tool setups and identifi ed its areas of application. To develop a matrix theory of accuracy for multi-tool machining and create a unifi ed algorithmic approach to errors modeling for all possible spatial multi-tool setups, it is necessary to consider the fl exibility of the technological system in all coordinate directions. In this regard, it is required to systematize a large number of existing multi-tool setups and classify it to structure the information and improve the understanding of its application. Purpose of the work is to develop a classifi cation of multi-tool setups on multicarriage and multi-spindle CNC lathes, enabling the creation of both a matrix model of machining accuracy for each classifi cation class and a unifi ed generalized matrix model of machining accuracy for the entire classifi cation class. The work investigates the systematics of multi-tool setups, oriented toward the development of matrix models of machining accuracy. Therefore, the classifi cation considered in this work is aimed at identifying the characteristics of force loading and deformation of the technological system during multi-tool machining. The research methods involve identifying the parameters used for classifi cation and the hierarchy of these parameters, which determines the levels and order of the systematics. Based on the principles of systematics of multi-tool setups used in traditional automatic lathes, an analysis of its adaptation to the capabilities of modern lathes designed for multi-tool machining is conducted. Results and discussion. As a result of the research, a formalized six-level classifi cation of multi-tool setups is developed, which includes the following aspects: the method of workpiece mounting, the set of carriages, the types of cutting tools, the types and directions of carriage feeds, the orientation of cutting tools relative to the workpiece, and the method of tool engagement (parallel, sequential). This classifi cation takes into account the technological capabilities for organizing multi-tool machining on modern CNC lathes. The main classes of the proposed systematics of multi-tool setups in the presented work include single-carriage single-coordinate setups, single-carriage two-coordinate setups, dual-carriage single-coordinate setups, dual-carriage two-coordinate setups, and multi-carriage setups. The proposed systematics of multi-tool setups on lathe group machines is aimed at developing machining accuracy models and can serve as a basis for developing recommendations on cutting modes for these CNC machines. The proposed classifi cation of multi-tool setups forms the foundation of the methodological support for the CAD system of lathe-automatic operations and serves as the basis for creating next-generation CAD systems for lathe operations. For citation: Yusubov N.D., Abbasova H.M. Systematics of multi-tool setup on lathe group machines. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 4, pp. 92–111. DOI: 10.17212/1994-6309-2024-26.492-111. (In Russian). ______ * Corresponding author Yusubov Nizami D., D.Sc. (Engineering), Professor Azerbaijan Technical University, 25 H. Javid avenue, AZ 1073, Baku, Azerbaijan Tel.: +994 (55) 324 50 12, e-mail: nizami.yusubov@aztu.edu.az References 1. Shinno H., Hashizume H. 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