Abstract
The measurement of the feeling of machine operation of power drill for architectural machine screw on the market have been performed. As a results,at the state of tunning off the power supply, the bad sense of grasping during handling existed in the part of the little finger and the palm of the hand. Morover, some machime caused a atrong pain on the palm and litlle finger after machine operation.Both of these penomena caused at the case of handle size came off the optimum grasping diameter.
