Development of online learning materials as a shop-talk substitute in grinding machine operation

The COVID-19 pandemic has changed the way educational institutions operate. Learning activities including grinding machines must adapt to a socially distanced learning environment, or to virtual classrooms, using online teaching materials. This study aims to; (1) describe the development of online teaching materials, including independent teaching materials, and video tutorials on Grinding Machine Operation; (2) describes the results of feasibility testing by experts, and (3) describes the results of testing the effectiveness of teaching materials substitution of Shop-talk grinding machines. The development of grinding machine teaching materials is carried out through Research and Development (R&D) adopting the Plomp model, the steps include; Preliminary research; Development or Prototyping; and Assessment. As test subjects, there were 39 students, who in 2020/2021 took the Grinding Machining course. Data were collected using questionnaires, multiple choice tests and performance tests to compose the WPS. Data were analyzed using descriptive analysis. The results of the development of teaching materials show: (1) the online teaching materials developed include; supplementary teaching materials for Shop-talk substitution, and grinding machine tutorial videos; (2) online teaching materials developed, based on expert judgment, are very suitable to be used as teaching materials for Grinding Machines; (3) the developed online teaching materials are effectively used for Grinding Machining training. The average test score for compiling WPS is 78. Of the 26 students, 18 of them (69.2%) were able to achieve the minimum mastery criteria for teaching materials.