A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

Control systems are disclosed for power tools such as table saws, miter saws, band saws, hand-held circular saws, jointers, shapers, routers, and up-cut saws. The control systems include systems to turn power tools on and off, and to control the supply of power to motors. The systems to turn power tools on and off may include dual switches that must be operated together to turn a power tool on. The systems to provide power to motors may include dual relays in series implemented with methods to minimize arcing and welding of the relays. The systems described herein may be implemented in power tools equipped with active injury mitigation technology.

Control systems are disclosed for power tools such as table saws, miter saws, band saws, hand-held circular saws, jointers, shapers, routers, and up-cut saws. The control systems include systems to turn power tools on and off, and to control the supply of power to motors. The systems to turn power tools on and off may include dual switches that must be operated together to turn a power tool on. The systems to provide power to motors may include dual relays in series implemented with methods to minimize arcing and welding of the relays. The systems described herein may be implemented in power tools equipped with active injury mitigation technology.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

Control systems are disclosed for power tools such as table saws, miter saws, band saws, hand-held circular saws, jointers, shapers, routers, and up-cut saws. The control systems include systems to turn power tools on and off, and to control the supply of power to motors. The systems to turn power tools on and off may include dual switches that must be operated together to turn a power tool on. The systems to provide power to motors may include dual relays in series implemented with methods to minimize arcing and welding of the relays. The systems described herein may be implemented in power tools equipped with active injury mitigation technology.

The problem of penetrating through nets and other objects is solved by cutting the object using various cutter systems, which include, for example a track and a moving carriage containing a cutter, a stationary carriage with a fixed or rotating arm, and/or abrasive cutters. The object is cut by a severing, slicing, or wearing action caused by a moveable blade or abrasive surface. An underwater vehicle incorporating an embodiment of the cutter system can cut a sufficiently large opening in the object to allow the vehicle to pass through.

Embodiments of a power saw are disclosed which comprise a base structure including a generally flat top having an upper work surface with the top having an opening through which a circular blade can extend, a relatively narrow box-like undercarriage pivotably mounted to the base around a pivot axis to provide an adjustable bevel angle of the blade relative to the top, and a motor saw assembly comprising an arbor shaft for mounting a circular blade thereon, a drive motor having an output shaft extending generally parallel to the plane of the blade, the output shaft being oriented 90 degrees relative to the arbor shaft, a speed reducing gear train interconnecting the output shaft and the arbor shaft, a gear housing enclosing the gear train, the motor saw assembly being adjustably mounted to the undercarriage to vary the portion of the blade that extends above the upper work surface.

A method of cutting a polymeric tubular member and apparatus therefor is provided. The method includes moving the polymeric tubular member along a central longitudinal axis into a position to be cut. Further, providing at least one actuator with a cutting blade operably connected to the at least one actuator, with the cutting blade extending lengthwise along a cutting blade axis. Then, actuating the at least one actuator and moving the cutting blade into cutting engagement with the polymeric tubular member along a driven axis that extends in oblique relation to the cutting blade axis.

A method and apparatus for cutting a polymeric tubular member is provided. The method includes moving the polymeric tubular member along a central longitudinal axis into a position to be cut and providing a cutting blade operably connected to an actuator. The method further includes actuating the actuator to move the cutting blade conjointly along a straight linear axis. Then, bringing a cutting region of the cutting blade into cutting engagement with the polymeric tubular member, with the cutting region engaging the polymeric tubular member extending over a length of the cutting blade that is greater than a diameter of the polymeric tubular member.