공회전 시간을 줄인 혁신적인 드릴 설계

Long idling time of currently used commercial electric drill increases the risk of accident and waste of time until restarting. Moreover, the long idling time causes the overpower of motor and reduces the life of battery. In this study, the new drill to reduce the idling time was designed. The breaking system using magnetic and rear was newly developed and installed to the new drill. The result shows that the idling time was largely reduced. It seems that the newly developed drill reduces the risk of accident and increases the efficiency.