Abstract: An apparatus for cutting a piece of work has a work supporting table which is movable only in one horizontal direction, and a spindle unit including a cutting tool which is disposed below the table for cutting the work from below. The spindle unit is movable in another horizontal direction perpendicular to the direction in which the table is movable, and in a vertical direction. The apparatus requires only a small space for installation, is simple in construction, an can perform an accurate cutting job at a high speed.

Abstract: A riding simulation system of motorcycle provides at least a model motorcycle on which a person can ride and which can be operated by a person. In response to the operation and movement of the person who rides on the model motorcycle, the model motorcycle is moved by a movable mechanism in a desirable direction such as a yawing direction, a rolling direction and a pitching direction. Preferably, the moving image such as the scenery which is seen from the running motorcycle is displayed in front of the person who rides on the model motorcycle. Such moving image is varied in response to the driving condition of the model motorcycle.