Ismael EHtiwesh, Ali Ahmed, Moayed Ali

Design and Implementation of a Closed-Loop CNC Engraving Machine Using Arduino-Based PID Control

Introduction

Design and implementation of a closed-loop cnc engraving machine using arduino-based pid control. Design and implement a low-cost Arduino-based closed-loop CNC engraving machine with PID control. This system enhances accuracy, repeatability, and responsiveness for digital fabrication, ideal for education and prototyping.

Abstract

A This paper presents the design and implementation of a low-cost desktop CNC engraving system enhanced with a closed-loop control mechanism using Arduino microcontrollers. The system addresses key limitations associated with traditional open-loop configurations, including position loss, limited motion accuracy, and inadequate response to dynamic disturbances. A dual-microcontroller architecture was adopted, where an Arduino Uno serves as the master for user interface and G-code parsing, while an Arduino Mega 2560 acts as the slave for real-time motion control. Closed-loop regulation was achieved through encoder-based feedback on the X and Y axes, driven by DC servo motors, while the Z axis employed a stepper motor. A digital PID controller was implemented to improve motion stability and tracking performance. A wireless PS2 controller and LCD display were integrated to support user interaction and manual positioning. Experimental evaluation included PID tuning, calibration of encoder-to-displacement mapping, and dynamic response assessment. The results confirmed notable improvements in positional accuracy, repeatability, and responsiveness over the open-loop baseline. The study demonstrates the feasibility of building accessible, precise, and responsive CNC systems using open-source hardware, contributing to affordable digital fabrication technologies for education and small-scale prototyping.

Review

This paper, "Design and Implementation of a Closed-Loop CNC Engraving Machine Using Arduino-Based PID Control," presents a significant contribution to the field of accessible digital fabrication. It adeptly addresses the pervasive limitations of traditional open-loop CNC systems, such as positional errors, compromised accuracy, and inadequate dynamic response, which often hinder their adoption in applications requiring precision. By proposing and implementing a low-cost, Arduino-based closed-loop control mechanism for a desktop CNC engraving system, the authors aim to democratize advanced manufacturing capabilities, making them viable for educational settings and small-scale prototyping. The methodological approach is robust and well-conceived, featuring a dual-microcontroller architecture where an Arduino Uno handles the user interface and G-code parsing, while an Arduino Mega 2560 is dedicated to real-time motion control. This division of tasks effectively optimizes the computational load for each microcontroller. Closed-loop control is skillfully applied to the critical X and Y axes through encoder-based feedback driving DC servo motors, with a digital PID controller implemented to ensure superior motion stability and tracking performance. User interaction is enhanced via a wireless PS2 controller and LCD display, adding to the system's practicality. The experimental validation, including PID tuning, encoder calibration, and dynamic response assessment, appears comprehensive, designed to rigorously test the system's performance improvements. The study's findings are compelling, demonstrating notable improvements in positional accuracy, repeatability, and responsiveness when benchmarked against an open-loop baseline. These results underscore the feasibility and inherent value of employing open-source hardware to construct sophisticated, precise, and responsive CNC systems at a fraction of the cost of commercial alternatives. The paper makes a strong case for advancing affordable digital fabrication technologies, offering a practical and effective framework for educators, researchers, and small businesses. Its contribution lies in successfully bridging the gap between low-cost hardware and high-performance control, thereby fostering innovation and expanding access to advanced manufacturing tools.

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