Power cutting tool

A power cutting tool having a body, a base for supporting the body, and a housing provided at the front end of the body, comprises a substantially saucer-shaped rotary cutter rotatably supported within and by the housing and having a cutting face substantially on the same level as the bottom of the base; a guide roller disposed in front of the housing and adapted to roll on a workpiece surface, which guide roller being vertically movable with respect to said body so as to control the depth of cut of the rotary cutter; a movable cover fitted to the lowermost end of the housing and adapted to annularly enclose the rotary cutter and to cover the workpiece surface so as to define a cutting chamber which in turn is defined into an inside chamber and an outside chamber by the rotary cutter; and a plurality of communicating ports provided on the rotary cutter and adapted to communicate the inside chamber and the outside chamber therethrough.