What should you do when the bit on the Drill Press begins to breakthrough the back of the stock?

When the bit on the Drill Press begins to breakthrough the back of the stock, easing up on the feed pressure is the appropriate action to take. As the bit nears breakthrough, it may create increased friction and unexpected forces that could lead to a dangerous situation, including the potential for the bit to grab or tear the material. By reducing the feed pressure, you allow for a more controlled and smoother exit of the bit through the material. This not only helps in maintaining precision but also enhances safety by minimizing the risk of damage to the workpiece or personal injury.

The other choices do not address the situation effectively. Increasing feed pressure would lead to more aggressive cutting, increasing the chances of the bit breaking through abruptly. Stopping the drill immediately might not provide the necessary control and could create stresses on the machine. Changing the bit is not relevant at this moment, as the current bit could still be used effectively with adjusted pressure during the breakthrough process.