A power tool comprising: a table structure including a work surface and defining a blade slot; a frame supporting said table structure; a blade assembly including; a blade operably positioned within said blade slot; a motor assembly coupled to said blade to operate the blade; and a carriage assembly supporting said motor assembly and pivotably mounted relative to said table structure to adjust the angular orientation of said blade relative to said table structure, said carriage assembly defining a chamber within which said blade operates and a discharge chute for discharge of dust and debris during operation of said blade, said carriage assembly including a cover arranged to define a gap between an upper edge of said cover and the underside of the table structure in which the size of the gap varies as the carriage assembly pivots relative to the table structure; and a dust cover assembly mounted between said carriage assembly and said table structure and sized to substantially cover said gap at all angular orientations of said blade relative to said table structure, said dust cover assembly mounted for movement relative to at least one of said carriage assembly and said table structure, characterized in that; said dust cover assembly includes a cover plate mounted to said carriage assembly for relative translation thereto, said cover plate including an upper edge mounted to said table structure for relative pivoting thereto, or said dust cover assembly includes a bendable sheet fixed at one end to one of said table structure and said carriage assembly; and the other of said table structure and said carriage assembly includes a guide channel within which an opposite end of said bendable sheet is slidably disposed. a table structure including a work surface and defining a blade slot; a frame supporting said table structure; a blade assembly including; a blade operably positioned within said blade slot; a motor assembly coupled to said blade to operate the blade; and a carriage assembly supporting said motor assembly and pivotably mounted relative to said table structure to adjust the angular orientation of said blade relative to said table structure, said carriage assembly defining a chamber within which said blade operates and a discharge chute for discharge of dust and debris during operation of said blade, said carriage assembly including a cover arranged to define a gap between an upper edge of said cover and the underside of the table structure in which the size of the gap varies as the carriage assembly pivots relative to the table structure; and a blade operably positioned within said blade slot; a motor assembly coupled to said blade to operate the blade; and a carriage assembly supporting said motor assembly and pivotably mounted relative to said table structure to adjust the angular orientation of said blade relative to said table structure, said carriage assembly defining a chamber within which said blade operates and a discharge chute for discharge of dust and debris during operation of said blade, said carriage assembly including a cover arranged to define a gap between an upper edge of said cover and the underside of the table structure in which the size of the gap varies as the carriage assembly pivots relative to the table structure; and a dust cover assembly mounted between said carriage assembly and said table structure and sized to substantially cover said gap at all angular orientations of said blade relative to said table structure, said dust cover assembly mounted for movement relative to at least one of said carriage assembly and said table structure, characterized in that; said dust cover assembly includes a cover plate mounted to said carriage assembly for relative translation thereto, said cover plate including an upper edge mounted to said table structure for relative pivoting thereto, or said dust cover assembly includes a bendable sheet fixed at one end to one of said table structure and said carriage assembly; and the other of said table structure and said carriage assembly includes a guide channel within which an opposite end of said bendable sheet is slidably disposed.