Thanthai Periyar EV Ramasamy Government Polytechnic College Vellore, Tamil Nadu
This work describes the conceptualization, construction, and experimental assessment of an economical mini belt grinding machine designed for accurate material removal with minimized energy usage. The developed unit operates using a single-phase electric motor that drives a continuous abrasive belt through a refined drive and idler wheel arrangement, ensuring consistent belt alignment and controlled grinding force. Mechanical robustness and reduced vibration are achieved by employing a rigid mild steel support structure, properly balanced rotating components, and low-resistance rolling bearings to ensure smooth functioning. An adjustable belt tightening mechanism together with a precisely finished platen surface contributes to improved geometrical accuracy and superior surface characteristics for different workpiece materials. Performance trials carried out on mild steel, aluminum, polymeric materials, and wood indicate stable stock removal capability and improved surface texture under various abrasive grit specifications. Energy performance comparison reveals lower electrical consumption than traditional bench-type grinding machines while sustaining effective machining efficiency. Due to its compact layout, affordable manufacturing cost, simple maintenance requirements, and scope for future enhancements such as variable speed regulation and automation features, the proposed system is well suited for small manufacturing enterprises, training institutions, and distributed workshop applications.
The mini belt grinder is a compact and multifunctional machining device designed for grinding, polishing, sharpening, and surface finishing applications. Its development addresses the increasing demand for space-efficient and economical grinding solutions in small workshops and decentralized manufacturing units. The system operates through a continuously rotating abrasive belt driven by an electric motor via a drive and idler wheel arrangement. Unlike conventional rigid grinding wheels, the flexible abrasive belt enables uniform material removal and improved surface integrity. The structural frame, typically fabricated from mild steel, ensures mechanical strength, rigidity, and vibration resistance during operation. A belt tensioning and tracking mechanism maintains proper alignment and stable motion throughout the grinding process.
2. System Architecture and Component Specification of the Mini Belt Grinder
This section presents the structural configuration, functional elements, and technical specifications of the developed mini belt grinder. The machine is designed to achieve efficient material removal, operational stability, and ease of maintenance through a carefully selected combination of mechanical and electrical components.
2.1 Prime Mover: Electric Motor
A 0.5 HP, 1440 rpm single-phase AC motor is employed as the primary power source of the system. The motor converts electrical energy into rotational mechanical energy required to drive the abrasive belt. Operating typically at 230 V and 50 Hz, the selected rating provides adequate torque for light to medium grinding tasks such as sharpening, polishing, and controlled stock removal.
2.2 Drive Wheel Assembly
The drive wheel is the principal rotating component responsible for transmitting motion from the motor to the abrasive belt. It is fabricated from mild steel or aluminium depending on load requirements and weight considerations. The wheel is mounted securely on the motor shaft using a key–keyway or set screw mechanism.
2.3 Idler Wheel Mechanism
The idler wheel is a non-powered rotating element that guides and supports the belt while maintaining alignment. Materials such as nylon, plastic, mild steel, or cast iron may be used depending on load and durability requirements. The idler wheel rotates freely on rolling-element bearings to reduce friction and wear.
2.4 Belt Tensioning System
A spring-loaded tensioning mechanism incorporating a high-carbon steel tension spring and adjustment bolt is provided to maintain optimal belt tightness. The system compensates for belt elongation during operation and ensures consistent contact pressure between the belt and workpiece. Proper tension improves tracking accuracy, reduces vibration, and enhances grinding efficiency.
S. Arunachalam*, U. Gokulnath, M. Kathiravan, S. Dhanush, G. Kaviyarasu, Design Optimization of a Mini Belt Grinding Machine for High-Accuracy Lathe Tool Edge Preparation, Int. J. Sci. R. Tech., 2026, 3 (2), 222-226. https://doi.org/10.5281/zenodo.18678645
10.5281/zenodo.18678645
