Patent ID: 8167518
Filing Date: 2012-05-01
Classification: B23Q,Y10S,Y10T

Abstract:
1. A power feed drill comprising: a servo motor; a roller screw rotatably mounted to the servo motor; a ball spline shaft having a first end connected to the roller screw, wherein the ball spline shaft has a channel and the roller screw extends into a portion of the channel, wherein rotation of the roller screw in a first direction moves the ball spline shaft in the first direction and wherein rotation of the roller screw in a second direction moves the ball spline shaft in an opposite direction to the first direction along an axis; an air motor capable of transmitting rotation motion to the ball spline shaft to rotate around the axis; and a collet chuck fixably attached to a second end of the ball spline shaft, wherein the collet chuck is adapted to receive a tool.