The pneumatic drill has member defining an air input and an air output and a housing defining an internal cylindrical chamber having bearing surfaces having a through axis. A driven shaft is coupled to the tool engaging chuck that defines a plurality of longitudinal slots. The driven shaft is disposed within the chamber and has a longitudinal axis offset from the through axis. A plurality of vanes each being partially formed of graphite that are individually disposed within one of the plurality's of longitudinal slots. Two of the vanes, the housing, and the driven shaft define a moving compression chamber.

A rotational control structure of a pneumatic tool includes a housing provided with a cylinder unit. The cylinder unit has a bottom wall with two through holes and a guide post extending outwardly. The guide post has a gas passage and a gas outlet. The guide post is closely connected with a rotatable control ring leaning against the bottom wall. A sealing ring is provided between the bottom wall and the guide post. The control ring has a control passage therein. The control ring is rotatable for the control passage to communicate with one of the through holes of the bottom wall, thereby controlling the forward/reverse rotation of the pneumatic tool.

A pneumatic motor with dual air intake includes a pneumatic cylinder and a rotor. The pneumatic cylinder includes a cylinder body, and an elliptic-cylinder-shaped accommodating room located in the cylinder body. The cylinder body has two air inletting paths, two air venting paths, two air venting holes and a front axial hole, which communicate with the accommodating room and outside. The rotor includes a rotor body rotatably accommodated in the accommodating room of the pneumatic cylinder, a plurality of grooves parallel provided on the rotor body, a plurality of vanes accommodated in the grooves respectively, and a front axle extended from the rotor body and inserted through the front axial hole. As a result, the pneumatic motor with dual air intake is lowered in friction of the rotor when it rotates, raised in power output, and lowered in vibration when in use.

A method of processing a workpiece comprises identifying processing locations on the workpiece, drilling a first hole at one of the processing locations using a rotary drive, sensing a flow of fluid while drilling, generating an operation signal based on the flow, comparing the duration interval of the operation signal to a predetermined temporal value, and drilling a different hole at a different processing location based on the duration interval and the temporal value.

The pneumatic drill has member defining an air input and an air output and a housing defining an internal cylindrical chamber having bearing surfaces having a through axis. A driven shaft is coupled to the tool engaging chuck that defines a plurality of longitudinal slots. The driven shaft is disposed within the chamber and has a longitudinal axis offset from the through axis. A plurality of vanes each being partially formed of graphite that are individually disposed within one of the plurality's of longitudinal slots. Two of the vanes, the housing, and the driven shaft define a moving compression chamber.

A pneumatic motor with dual air intake includes a pneumatic cylinder and a rotor. The pneumatic cylinder includes a cylinder body, and an elliptic-cylinder-shaped accommodating room located in the cylinder body. The cylinder body has two air inletting paths, two air venting paths, two air venting holes and a front axial hole, which communicate with the accommodating room and outside. The rotor includes a rotor body rotatably accommodated in the accommodating room of the pneumatic cylinder, a plurality of grooves parallel provided on the rotor body, a plurality of vanes accommodated in the grooves respectively, and a front axle extended from the rotor body and inserted through the front axial hole. As a result, the pneumatic motor with dual air intake is lowered in friction of the rotor when it rotates, raised in power output, and lowered in vibration when in use.

A system for processing a workpiece, including a rotary drive having a path along which a flow of a fluid is established during operation, a sensor in communication with the path, to generate a signal responsive to the flow of the fluid and not to generate the signal responsive to an absence of the flow, and a controller communicatively coupled to the sensor to enable the operation of the rotary drive subsequent to a termination of the signal if a duration interval thereof is greater than or equal to a predetermined value, and to prevent the operation if the duration interval of the signal is less than the predetermined value. The rotary drive may include a drill.

A system for processing a workpiece, including a rotary drive having a path along which a flow of a fluid is established during operation, a sensor in communication with the path, to generate a signal responsive to the flow of the fluid and not to generate the signal responsive to an absence of the flow, and a controller communicatively coupled to the sensor to enable the operation of the rotary drive subsequent to a termination of the signal if a duration interval thereof is greater than or equal to a predetermined value, and to prevent the operation if the duration interval of the signal is less than the predetermined value. The rotary drive may include a drill.