MOTOR-DRIVEN MACHINING DEVICE

PROBLEM TO BE SOLVED: To provide a motor-driven machining device inexpensively manufacturable, easily performing the replacement of an electric motor and a maintenance inspection and shortening the total length when storing the device. SOLUTION: This device has a cylinder body 3 provided with mounting seats 11 and 12 mounted integrally with front and rear guide blocks 14 and 15 or a cylindrical member 18, a hollow member 40 slidably arranged on the cylinder body 13 and provided with a piston 21 at an intermediate position, a spindle 51 rotatably mounted on the hollow member 40, a motor supporting frame 54 provided on a base part of the hollow member 40, the electric motor 59 mounted on the motor supporting frame 54, and a belt member 60a for transmitting rotation power from a first pulley 60 provided on an output shaft of the electric motor 59 to a second pulley 53 provided on a base part of the spindle 51.