Porter-Cable's new 390K 5-inch random orbit sander looks different because it is different. It is built around a new type of DC motor that Porter-Cable calls the EnduraTech. Besides not having brushes to replace, the motor has 71% fewer wear components, which should result in much longer tool life, according to the company. This DC motor also gives the sander more torque and a much shorter profile, much like the look and low-slung balance of pneumatic, random orbit sanders commonly used in manufacturing industries.
