A positive feed tool configured to operate in a first mode and a second mode, the feed tool comprising: an elongated spindle adapted to carry a tool bit and to rotate and to move axially along a feed path, the spindle configured to operate in a first mode to move axially along the feed path in a first direction and a second mode to move axially along the feed path in an opposing second direction; first and second gears (31, 32) each operatively connected to the spindle; a differential drive comprising an elongated shaft spaced laterally away from the spindle, a piston positioned on the shaft, and third and fourth gears (41, 42) positioned on the shaft; a drive train (20, 21) that is engaged with the third gear to drive the differential drive; the third gear and the first gear being engaged to rotate the spindle, and the fourth gear and the second gear being engaged to axially move the spindle; a chamber positioned at the differential drive and comprising sidewalls, a closed end, and an opposing open end, the chamber positioned with the shaft extending into the open end and the piston positioned within the chamber; an inlet that extends through the closed end of the chamber; a poppet valve comprising a head and a stem to control fluid flowing through the inlet and into the chamber; wherein the differential drive is movable relative to the chamber between first and second positions to selectively move the spindle between the first and second modes, the first position comprising the piston in closer proximity to the closed end, and the second position comprising the piston positioned a greater distance from the closed end; characterized in that a magnet is positioned on one of the piston and the closed end and a plate is positioned on the other of the piston and the closed end, the magnet and plate being magnetically attracted together to magnetically bias the piston towards the closed end of the chamber; the poppet valve is positioned at the inlet; and the first position comprises the piston in contact with the head to position the head across the inlet, and the second position comprises the head of the poppet valve spaced away from the inlet to allow fluid into the chamber. an elongated spindle adapted to carry a tool bit and to rotate and to move axially along a feed path, the spindle configured to operate in a first mode to move axially along the feed path in a first direction and a second mode to move axially along the feed path in an opposing second direction; first and second gears (31, 32) each operatively connected to the spindle; a differential drive comprising an elongated shaft spaced laterally away from the spindle, a piston positioned on the shaft, and third and fourth gears (41, 42) positioned on the shaft; a drive train (20, 21) that is engaged with the third gear to drive the differential drive; the third gear and the first gear being engaged to rotate the spindle, and the fourth gear and the second gear being engaged to axially move the spindle; a chamber positioned at the differential drive and comprising sidewalls, a closed end, and an opposing open end, the chamber positioned with the shaft extending into the open end and the piston positioned within the chamber; an inlet that extends through the closed end of the chamber; a poppet valve comprising a head and a stem to control fluid flowing through the inlet and into the chamber; wherein the differential drive is movable relative to the chamber between first and second positions to selectively move the spindle between the first and second modes, the first position comprising the piston in closer proximity to the closed end, and the second position comprising the piston positioned a greater distance from the closed end; characterized in that a magnet is positioned on one of the piston and the closed end and a plate is positioned on the other of the piston and the closed end, the magnet and plate being magnetically attracted together to magnetically bias the piston towards the closed end of the chamber; the poppet valve is positioned at the inlet; and the first position comprises the piston in contact with the head to position the head across the inlet, and the second position comprises the head of the poppet valve spaced away from the inlet to allow fluid into the chamber.