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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 10 Issue: 04 | Apr 2023

p-ISSN: 2395-0072

www.irjet.net

Design and Analysis of an 8-Speed Gear box. Abhishek Chavan1, Abhiraj Baji2, Yash Darakh3, Chinmay Inamdar4 145Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune-48, Maharashtra, India

---------------------------------------------------------------------***--------------------------------------------------------------------approximate 8.5HP(6.33kW) and 650rpm motor has been Abstract - Lathe Machine is used in all the engineering applications and in the college Workshops. Lathe machine is used to perform all the basic operations such as drilling, cutting, tapping, turning, etc. with the help of different tools placed in the work environment There are 2 main types of Lathe machines: Capstan Lathe and Turret Lathe. Turret Lathes use a turret head to perform operations. A turret head is a vertical cylindrical revolving tool-holder for bringing different tools into action successively in the lathe machine. The turret head needs to rotate at different speeds to perform different operations on the workpiece. This is controlled by a gearbox. A gearbox which converts high speed input into various output speeds is called a multi speed gearbox. A 6speed gearbox is usually used. But 8-speed and 9-speed gearboxes give a wider range of speeds and efficiency. The aim of this project is to design and analyze 8-speed gearbox which meets the functional requirements of a turret gearbox. Design and Analysis have been conducted and a detailed study has been performed for various components in the gearbox.

selected. The values will be explained further on in the project.

Key Words: Lathe, Gearbox, Turret, Gears, Shaft, Ray Diagram, etc.

2.1 Derivation of Structural Formula

1.2 Deciding Material After trial and error with various materials in the design process and opinions of industry professionals, materials for the following components were decided mainly based on strength and durability. Gear: All the gear are made from ‘Grey Cast Iron’. Shaft: All the shafts have been made of the material ‘Steel FeE 580’. Keys and keyways: All the keys have been made out of ‘Steel 50C4.’ Casing: The casing has been made from ‘Cast Iron’.

2. DETAILED DESIGN PROCEDURE

The structural formula gives information about various aspects of the gearbox like number of shafts, number of gears and a basic idea of transmission pairs. It tells about transmission range as well. The procedure followed to reach the structural formula is explained below.

1. INTRODUCTION Ever since the development of the first gearbox by Sturtevant in 1904 for automobile application, the utilisation of this technology has evolved marking its presence in various industrial sectors like power generation, petroleum refining, mining and material handling, metal processing and so on. Considering the metal processing and machining aspect, a wide range of industrial gearboxes are used in lathe machines. These gearboxes offer a vivid range of operating speed, and the main aim of this project is to design an 8Speed gearbox for using in turret lathe machines.

Law of Discretizing Speeds: Discretizing speeds between minimum speed and maximum speed is very important to know our output speeds. These speeds are decided by three basic laws as depicted in the table below.

1.1 Deciding Input Requirements Speed Requirement: After a comprehensive study on speed ranges (Nmin and Nmax) for turret lathe, we arrived at a generic average value of 100rpm to 1100rpm. These values are optimal for further processing and give a better design result as compared to other experimental values as well. Torque Requirement: Turret lathe gearboxes usually require a power of approximately 5-8kW [2]. Motor Selection: Motor selection has been done taking power and input speed conditions into account. An

Impact Factor value: 8.226

Fig -1: Laws of discretizing speeds.

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