Patent ID: 8007210
Filing Date: 2011-08-30
Classification: B23B,B23Q,Y10T

Abstract:
1. A drilling machine, comprising: a first gear with a first axis of rotation, and having a cam follower 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 plate fixed to the housing; and 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, the first and second axes of rotation being coincident with the third axis of rotation, and wherein the cam follower is adjacent the cam plate; a plurality of steel balls partially embedded in either one of the cam plate or the cam follower, the steel balls being free to rotate; and an undulating surface on the other one of the cam plate or the cam follower, the undulating surface being in contact with the steel balls and being configured such that, when the first gear rotates to impart a linear feed to the spindle, the first gear is caused repeatedly to retract and then to advance.