Patent ID: 7882901
Filing Date: 2011-02-08
Classification: B23B,B23Q,Y10T

Abstract:
1. A drilling machine, comprising: a first gear with a first axis of rotation, and having a cam follower surface rotationally fixed to the first gear; a second gear with a second axis of rotation coincident with the first axis of rotation; a housing configured to support the first gear and the second gear, the housing having a cam surface fixed to the housing; a tool holder spindle with a third axis of rotation; wherein the first and second gears are configured to impart both a linear feed and a rotation to the spindle by which, when the first and second gears rotate, the spindle simultaneously rotates and axially advances through the first gear and the second gear along the first and second axes, whereby, a single rotation of the spindle causes the spindle to advance through the first and second gears by a first axial displacement, the first and second axes of rotation being coincident with the third axis of rotation such that the cam follower surface is in contact with the cam surface, so that rotation of the first gear causes the cam follower surface to rotate against the cam surface; and further; wherein the cam surface and the cam follower surface are shaped with undulations such that for every single rotation that the first gear undergoes, an assembly comprising the first gear and the spindle advances and retracts by a second axial displacement.