How is a power rating (UWO) generated?
Measuring a drill’s power output is a common procedure in the industry. When manufacturers refer to power, they could be referring to UWO or MWO. A UWO rating is generated using a process that can reflect the users applications. A drill is mounted into a rig. The chuck of the drill is locked onto a spindle. The spindle in this test is not fixed and thus rotates as the drill is fully powered. With the chuck spinning at the maximum RPM (could be 1st, 2nd, or 3rd speed) torque loads are increasingly applied to the spindle. As the torque loads increase, the drill slows down. These torque loads can reflect the users applications. The drills Unit Watts Out is the point of the drills maximum power output (Power, remember, is a combination of speed and torque). It is found where the drills speed and torque level are the highest.
