A power tool includes a table structure defining a blade slot, a frame supporting the table structure, a blade assembly mounted within the frame, and a carriage assembly. The blade assembly includes a blade positioned within the blade slot and a motor assembly to rotate the blade, in which the carriage assembly supports the motor assembly relative to the table structure. The carriage assembly defines a chamber within which said blade operates and a discharge chute for discharge of dust and debris from the chamber during operation of the blade. The bottom wall of the carriage assembly below said blade defines a plurality of openings that are sized to permit passage of the dust and debris. The openings may be sized to comply with finger probe test safety standards. In certain embodiments, the openings may be provided with a cover that is movable to expose or close the openings.