Abstract: An observation device for a portable circular saw includes a recess defined in the base and located at a position corresponding to a periphery of the circular blade. An observation device includes a transparent member which is connected to the base and covers the recess. The user can see the position that the periphery of the circular blade cuts the object via the observation device.

Abstract: A laser guiding device is adjustably connected to a support frame on a top of the tile cutting machine and includes a frame in which a laser generating piece is received. An adjusting screw threadedly and transversely extends through the frame and is rotatably connected between two side walls of the support member such that the laser generating piece is moved in the direction of the adjusting screw to generate a laser beam on the tile to be cut. The laser beam is visible regardless of the surface condition of the tile and the debris during cutting.

Abstract: A tile positioning device of a tile cutting machine includes a first piece slidably engaged with the gauge and a second piece is pivotably connected to the first piece. The second piece includes two protrusions and a right angle is defined between two surfaces of the two protrusions for clamping two sides of a tile and the tile can be rotated relative to the blade of the cutting machine by rotating the second piece. A third piece is optionally and pivotably connected to one of the two protrusions for adjusting the positioning of the tile.

Abstract: A laser guiding device is adjustably connected to a protection member on a top surface of the tile cutting machine so as to produce a laser beam on a tile to be cut. An adjusting screw threadedly and transversely extends through the laser guiding device and the protection member such that the position of the laser generating piece of the laser guiding device can be adjusted. The laser beam is visible regardless of the surface condition of the tile. A first fence is pivotably connected to an open bottom of the protection member to cover the rotating blade. A second fence is pivotably connected to the protection member and is pivoted upward by the tile so as to pivot the first fence upward.