From a distance, the antennas atop a cell-phone tower don’t look that big. In fact, those “little” white boxes are 4 to 12 feet long, 2 feet wide and 1 foot deep. These boxes may be packed with ...

Abstract: This paper proposes low-cost automatic screw machine using a commercial manual electric screwdriver. The proposed system is designed for measuring torque and Z-axis force while fastening the ...