Development of CNC machining II textbooks to increase the effectiveness of student learning in the mechanical engineering education study program

This research is research development. The research model used in this research is
the development of 4D (Four-D Model) which consists of four stages: the defining stage, the
design stage, and the development phase. While the dissemination phase was not carried out
because this research was only limited to the feasibility test and the effectiveness of learning
media in the form of books. In this study, the respondents were 3 book experts, 3 lecturers who
had CNC machine expertise competence in the Department of Mechanical Engineering
Education, Faculty of Engineering, State University of Medan. The research instrument used to
collect data in the form of questionnaire sheets and observation sheets. Data analysis was
performed to determine the feasibility and effectiveness of the resulting CNC II / advanced
book. From the results of this development research, it was shown that the developed CNC II /
advanced book was suitable for use in learning advanced CNC courses. The results of book
validation by book experts amounted to 86.67%, CNC exports amounted to 95.80.% Included
in the very feasible criteria. The effectiveness of the advanced CNC learning book that was
developed already meets the requirements of learning media with a percentage of positive
student responses to the book of 96.11% of the criterion score, as well as an increase in student
learning activities expressed in percentag