push drill การใช้

• As of 2013 Schroeder of Germany continues to sell " Yankee " branded screwdrivers and push drills.
• Since a wide variety of drill bits are available in this format, the tool can do double duty as a " push drill " or Persian drill.
• push drill ", one of the very few mechanisms that use a screw in the " backwards " sense, to convert linear motion to rotational motion.
• Most screws are designed to be self-locking, and in the absence of torque on the shaft will stay at whatever position they are left . However, some screw mechanisms with a large enough pitch and good lubrication are not self-locking and will overhaul, and a very few, such as a push drill, use the screw in this " backwards " sense, applying axial force to the shaft to turn the screw.