Pipe end preparation machine

A pipe end preparation machine comprising:

• a frame mounted on a mast positionable in oriented relation from and beyond an end of a pipe;
• a tool head, means mounting the tool head on said frame for rotation about an axis, means for rotating the tool head;
• a tool slide, means mounting the tool slide on said tool head for movement along a path radial to said axis to provide radial feed for a tool carried thereon;
• and drive mechanism for moving said tool slide radially including a rotatable gear carried by the tool head, a ring gear mounted rotatably relative to said tool head and meshing with said rotatable gear, and means including a variable speed motor with an output shaft which is braked when the motor is deenergized and a disengageable clutch operable to connect or disconnect the motor output shaft with a drive gear meshing with the ring gear operable to establish three different conditions of operation of the tool slide responsive to three different conditions of operation of the ring gear including a first condition wherein the clutch is disengaged and the ring gear is free to rotate with the tool head as caused by engagement of the rotatable gear with the ring gear and the tool slide does not move radially, a second condition wherein the clutch is engaged and the motor output shaft is braked to lock the ring gear against rotation and the rotatable gear is caused to rotate by rotation of the tool head relative to the ring gear and the tool slide moves radially, and a third condition wherein the clutch is engaged and the motor operating to rotate the ring gear and modify the rotation of the rotatable gear from that obtained in the second condition to obtain a different speed of radial movement of the tool head than that in the second condition.