Abstract: A mortising machine comprises a base plate arranged to be located on a surface of a workpiece to be machined and having an opening, a mortising tool extending through the opening of the base plate and arranged to penetrate into the workpiece so as to remove chips and to produce a groove-like recess in the workpiece during displacement of the mortising machine, and a chip removing device provided with a suction opening in the area of the opening of the base plate. The chip removing device is also provided with a second suction opening which is spaced from the first mentioned suction opening so as to open out in the area of the groove-like recess in the workpiece.