U Shield 3 Axis CNC Router Training in Tegal City Metal Group to Improve Machinery Capability

ABSTRACT


INTRODUCTION
Tegal is Kota Bahari (a maritime city) with an area of 87.60 km 2 . It has many shipbuilding industries. The boundaries of the city of Tegal are Brebes Regency in the west, Tegal Regency in the south, and Pemalang Regency in the east [1]. Besides, Kota Bahari, Tegal is also known as the Japanese of Indonesia. The nickname is due to the large number of foundry and metalworking industries and many residents that open workshops to process and produce agricultural tools, auto and motorcycle parts up to jewelry [2]. Small and Medium Industry (IKM) is the most important sector for the contribution of the country's gross income, where it is hoped that every year there will be an increase in the number of IKM centers in the regions. There are 4 pillars of a strategic approach in order to increase competitiveness, where it is hoped that small and medium industries will have creativity, innovate technology, and good insight and knowledge. The 4 pillars are [3] Based on research, one of the main problems faced by micro, small, and medium enterprises is limited capital that the average workforce is only junior high school graduates so that they have low competence and ability to improve product quality [4]. Then, [5] in the study to identify the problems of micro, small, and medium enterprises, there are low quality of human resources, traditionally-managed business, and products that can only be competent in the local field.
Increasing creativity, innovating technology and having good insight and knowledge in small and medium industries (IKM) in the metal sector of Tegal City are the obligations and responsibilities of the relevant agencies and universities. The work program of the Tegal City Industry Service to advance the knowledge and skills of the IKM human resources continues to be encouraged, in synergy with the Pancasakti University of Tegal. There are so many technologies that are produced by academics but only as a beacon, and have no impact yet to IKM. Aspects of knowledge, attitudes and skills must be possessed by IKM human resources because the demands of the market and consumers are so high in productivity, ability of human resources, and quality products [6]. This strategy to increase the capacity of human resources can be done by creating a partnership program between metal producers on a national scale and metal IKM entrepreneurs in Tegal City [7], or it could be through collaborative trainings between universities-IKM and the local government. The Tegal City government's attention to the enhancement of the competitiveness of the metal industry is massive, because the Regional Government has procured CAD and NC-based machine tools, where it is hoped that the use of the latest NC-based machine methods can replace the old method that uses manual skills and simple equipment [8]. However, many of the human resources of the small and medium metal industries in Tegal City are not quite ready to operate these NC-based machines because of its high technology and they have not mastered it. One of the NC-based machine technologies, namely the U shield 3 axis router machine, was developed by lecturers and students from the mechanical engineering study program, Faculty of Engineering and Computer Science, Pancasakti University Tegal. The machine was assembled and made by the academic community themselves. The specifications of the U Shield 3 axis router machine are that it uses the TB6600 motor driver with Match3 driving software, and has been applied for pocketing [9].

U Shield 3 Axis Cnc Router Training in Tegal City Metal Group to Improve Machinery Capability (Santosa et al)
177 Based on the problems described above, the formulation of the problems in this community service program consisting of: a. How is the training model for the metal entrepreneur group on the operation of the 3 axis U Shiled CNC Router machine in Tegal City? b. How is the participants' enthusiasm for the operation of the 3 axis CNC Router U Shiled 3 axis machine training activity? The purpose of holding this community service activity is hoped that the small and medium industries of Tegal City engaged in the metal sector will increase their understanding of the operation of CNC and some supporting software and establish good cooperation between universities and small and medium industries.

METHOD
The method adopted by the community service activities is by training the operation of wood lathes on the target group Usaha Jati Murni Sekuro Village [11]. The stages of implementing this program are as follows: a. Problem Identification.
In implementing the community service program, planning is needed by identifying the problems of the Tegal City metal entrepreneur group. Problem identification is based on interviews with the head of the metal group in Tegal City and also interviews with the Department of Industry. The results of the problem identification are:

Product Design and Simulation using CAD-CAM
The stages of making a product that will be made using CAD-CAM are described in the following steps : a. First is to open the Inventor software to create an HP casing design. b. The dimensions of the workpiece are 100 mm long, 50 mm wide and 5 mm thick. c. The next step is the CAM process for setting and simulating machining. Some things that need to be set are: Workpiece setup, Tool selection, Speed and Feedrate settings, and the Simulation process.

The Effectiveness of Operational Training on U Shield 3 axis CNC Router Machines for Metal Entrepreneurs in Tegal City.
In accordance with the flow of activity, the implementation is divided into several stages as follow: a. Socialization Stage At this stage, the team coordinates and communicates with related parties regarding the training activities. Coordination and communication are carried out intensively so that activities can take place properly according to the wishes and expectations of the target group. The target group is the metal entrepreneur group of Tegal City with as many as 15 participants, so that they are present in the service activity.  At this stage, participants are trained on how to make HP casing products using materials that have been prepared. The target group was given design practice in 2D and 3D and machining simulation using supporting software and the practice of using U Shield 3 Axis CNC Router machine.

Evaluation of Training activities
This stage was the evaluation of the implementation of the U Shield 3 axis CNC Router machine training activity using the questionnaire method [12]. It was carried out during practice, namely by looking at the direct conditions of participants doing practice and post-practice evaluation.
During the practice, many of the participants complained about the slow loading of their laptops because they had to install some supporting software. This took time as the technical specifications of the laptops from the participants were different each other. Then, during the practice of making product designs using CAD and machining simulations using CAM, some participants often missed the drawing and simulation steps [14][15][16][17]. It was because the VERY REQUIRED REQUIRED participants' abilities in understanding technical drawings and understanding of G code were not the same. For the practice of machining the U Shield 3 Axis CNC Router machine, participants did not experience many problems because they had prior understanding of machining [18][19][20]. The only obstacle experienced by the participants when they first operated the NC-based machine was setting the zero point of the work piece and the tools used.

Post-Activity Evaluation
Post-activity evaluations were carried out to monitor the progress of the target group towards the training, both hard skills and soft skills that have been given. The evaluation was to see the level of success and enthusiasm of participants for this service activity [13]. In the post-activity evaluation, an online questionnaire was given to the participants to see their enthusiasm, understanding, and knowledge about this service program.
Some of the questionnaires given, especially the role of the Department of Industry in Tegal City regarding progress and programs to support Metal entrepreneurs in Tegal City, showed that the role of the Office was related to the good category of metal entrepreneurs in Tegal City. Then, the material delivered by the tutor regarding NC-based machines and their development was also categorized as good by the participants. Based on the questionnaire regarding the practice of operating the U Shield 3 axis CNC Router machine, many participants answered that the machine was very easy to operate. They answered that training activities like this were very necessary to increase knowledge of NCbased machines.

CONCLUSION
It can be concluded that the implementation of activities divided into several programs, namely Soft Program and Hard Program. The Soft Program includes the provision of material from the Department of Industry regarding programs from the Regional Government on the progress of metal in Tegal City and material on NC-based machines and their development. While the Hard Program covers the practice of how to make 2D and 3D product designs, machining simulation, G code transfer and machining practice. Evaluation of activities during practice is about the slow loading of laptops from participants whose specifications are not the same. Then, there are still many participants who are left behind in carrying out the design steps to simulation. The post-activity evaluation is that the participants are enthusiastic about the continuation of this service activity. They expect the continuation of this training program but more concentrated on design training or drawings in 2 and 3 dimensions, because many metal entrepreneurs in Tegal City get job sheets from consumers in the form of finished objects that must be redrawn, while the redrawing process usually uses a third party.