Pengembangan Produk Lifestyle Berfitur Menghibur Dengan Teknologi CNC Bagi Komunitas Kreatif Cirebon

Kegiatan Pengabdian kepada Masyarakat pengembangan produk gaya hidup dengan fitur menghibur berbasis teknologi CNC bagi komunitas kreatif Cirebon melibatkan akademisi, desainer-pengusaha, aktivis desa, serta mahasiswa Merdeka Belajar dan Kampus Merdeka (MBKM). Pelatihan berlangsung selama 6 bulan dan telah menghasilkan output berupa produk dan skill dan metode-metode pengembangan produk, serta pengenalan pasar. Proses pengembangan produk menekankan pemanfaatan teknologi Computer Numeric Control (CNC). Teknologi Computer Numeric Control (CNC), khususnya untuk pemotongan bahan dan pembuatan kontur 3 dimensional. Hasil akhir pelatihan adalah 6 tas kulit dengan dengan fitur baru mekanik pengunci dari logam dan kayu yang memberikan efek menghibur. Keenam produktersebut telah terdaftar Hak Desain Industri-nya pada Direktorat Jenderal Kekayaan Intelektual (DJKI). Kedepan produk pengembangan ini akan mengikuti pameran dan diharapkan menjadi usaha dan produk yang memiliki daya saing ditengah pasar modern saat ini

Enhancing Students Learning Outcomes and Creative Thinking Skills in Computer Numeric Control Subject Using Project-Based Learning Model

This study aimed to determine the effect of project-based learning on student learning outcomes and creative thinking skills in computer numeric control subjects at SMK KAL-1 Surabaya. This study used a quasi-experimental factorial research design with a 2-way ANOVA test technique. In this study, 66 students from class XI of the Mechanical Engineering Expertise Program were divided into experimental groups (n= 33) and a control group (n= 33). The instrument used in this research is in the form of test sheets and observations to measure the level of students creative thinking and their learning outcomes. This study found that student learning outcomes using project-based learning are significantly higher than students who taught using direct learning models in computer numeric control subjects. Furthermore, the learning outcomes of students who have a high level of creative thinking are significantly higher than those of students who have a low level of creative thinking. Moreover, there is an interaction between using learning models and creative thinking on three domains of learning outcomes (cognitive, affective, and psychomotor) in computer numeric control subjects.

Rapid prototyping of custom radiocontrast agent markers for computed tomography–guided procedures

The objective of this study was to evaluate a method for printing a custom radiocontrast agent mixture to develop computed tomography markers of various shapes and sizes for assisting physicians in computed tomography–guided procedures. The radiocontrast agent mixture was designed to be bright in a computed tomography image, able to be extruded from a nozzle as a liquid and transition into a solid, and sufficiently viscous to be extruded through the tip of a needle in a controlled manner. A mixture printing method was developed using a syringe to house the mixture, a syringe pump to extrude the mixture, and a computer numeric control laser cutter to direct the nozzle in the desired path. To assess the efficacy of printing the radiocontrast agent mixture, we printed several designs, collected computed tomography images, and evaluated various physical properties of the printing method and the resulting computed tomography markers. The average line thickness was 1.56 mm (standard deviation of 0.19 mm, n = 30), the infill percentage was 99.9%, and the deviation in roundness was 0.23 mm ( n = 30). These results demonstrated the ability of the proposed method to create various types of skin markers, such as dots, lines, and hollow or solid shapes. Additionally, flat printed patterns can be folded to form three-dimensional structures that can be used to guide and support needle insertions.

Effect of Pipe Cutting Gap using CNC toward Surface Hardness

This research concerned the standard value of surface roughness on Computer Numerical Control (CNC) to obtain fine pipe cutting result and is more useful for company to simply recognize the appropriate standard gap in designing. Standard design used is 30 mm with 3 specimen variations and variation gap value of 42 mm, 44 mm, and 46 mm. In recognizing fine refinement, standard on Roughness Average (RA) is used with surface roughness scale tool. Based on the experiment, it shows that gap design for pipe with Computer Numeric Control (CNC) in 30 mm has less optimum result because its cutting result still has crust, the gap is still considered too close. Therefore, re-grinding was conducted to result smoother result in achieving surface roughness value of 32RA. Fine pipe result without crust is 46 mm with roughness value of 4 RA. The smaller value obtained from measuring surface roughness, the more optimum result obtained.

Accelerated Thermal Simulation for Three-Dimensional Interactive Optimization of Computer Numeric Control Sheet Metal Laser Cutting

In the context of computer numeric control (CNC)-based sheet metal laser cutting, the problem of heat transfer simulation is relevant for the optimization of CNC programs. Current physically based simulation tools use numeric or analytic algorithms which provide accurate but slow solutions due to the underlying mathematical description of the model. This paper presents: (1) an analytic solution to the laser heating problem of rectangular sheet metal for curved laser trajectories and convective cooling, (2) a graphics processing unit (GPU) implementation of the analytic solution for fast simulation of the problem, and (3) an integration within an interactive environment for the simulation of sheet metal CNC laser cutting. This analytic approach sacrifices the material removal effect of the laser cut in the favor of an approximated real-time temperature map on the sheet metal. The articulation of thermal, geometric, and graphic feedback in virtual manufacturing environments enables interactive redefinition of the CNC programs for better product quality, lower safety risks, material waste, and energy usage among others. The error with respect to finite element analysis (FEA) in temperature prediction descends as low as 3.5%.

Pervasive Investigations of Critical Speed over Weight and Deflection Factors of Shaft Assembly in CNC Ball Screw System

The demand for higher productivity requires machine tools to work on the adequate critical speed to have faster and more accurate ball screw system. Ball screw affects severely over the higher rotation speed of the shaft in computer numeric control (CNC) machining centers. This paper deals with an approach to calculate the initial critical speed of the shaft. Critical speed requires significant attention due to its major use in the manufacturing sectors. The impacts of weight on the critical speed of shaft assembly have been analyzed from theoretical as well as analytical investigations. Additionally, we evaluated the impact of weight on the deflection of the shafts along with failure analysis of shafts with respect to critical speed. Further, we computed the results for critical speed based factor to enhance the accuracy of CNC machining centers. Finally, the analytical estimations have been carried out to prove the validity of our proposal.