ABSTRACT
This chapter details air-powered and electrically powered screw-driving equipment. In the industry it is customary to categorize all applications as “hard” or “soft.” A “soft” joint is one that never stops being soft, similar to driving a wood screw. “Hard” draw or slam described the situation where there is either a free-running condition of screw entry into the hole until just before the screwhead seats, when there is a sudden buildup of resistance. Right-angle drivers have drive-spindles at a 90 degree angle to the combination handle and body motor housing. Electric screwdrivers have many good features, not the least of which is low noise. Clutch-controlled power drivers are found in the field much more frequently than the direct-drive—air stall type. The reason is one of convenience; the fact that they are adjustable within ranges of torque is an important consideration since they may be used more easily on a wider variety of applications.
