Design and Structural Analysis of 3-Axis CNC Benchtop Milling Machine

Abstract

When dealing with machining accuracy and reliability, performing a structural and modal analysis is an essential aspect of understanding loads' effects on physical structures and their components. In this paper, the static and modal analysis is performed on the 3-axis benchtop CNC milling machine. This study deal with all the required procedures for design two open frame structures of the machine using CAD software. Altair SolidThinking Inspire software proposes the new design, and the structures were analyzed using the FEA technique. The result of the dynamic analysis was compared and validated using the experimental impact of the hammer test. The result showed that mode shape one of design B structure's modal frequency was higher than design A, meaning that the spindle speed should be further limited. Design B produced reliable results for static displacement and dynamic performance. The theoretical, this machine was capable of performing machining operation with the maximum cutting speed of 1650 RPM. It ensured that the machining output could be enhanced in terms of accuracy and repeatability. By comparing the machine structure with both designs, design B is the better design and chosen as the machine design structure.