أرسل هذا في رسالة قصيرة: Measurement and analysis of thrust force and torque in friction drilling of difficult-to-machine materials

__    __   _    _    _    _    _    _             
\ \\ / // | || | || | |  | || | || | ||   ____    
 \ \/ //  | || | || | |/\| || | || | ||  |    \\  
  \  //   | \\_/ || |  /\  || | \\_/ ||  | [] ||  
   \//     \____//  |_// \_||  \____//   |  __//  
    `       `---`   `-`   `-`   `---`    |_|`-`   
                                         `-`