Offset Algorithm for Compound Angle Machining of Parts when Tool Motion is Unrestricted in Space

Although the performance of CNC machines is accurate, unavoidable human errors at the part loading position have serious repercussions on engine performance.

In the present paper the authors would like to develop an algorithm for error compensation when the tool movement is unrestricted in space. The new solution algorithm will be in terms of the known initial system variables such as the part loading errors, drill tool inclinations, location of spindle etc. This modified paper employs the same principles of inverse kinematics as done in the earlier paper wherein a faulty compound-hole angle axis in space caused by the translational and rotational errors at the part loading position is identified with an imaginary true axis in space by enforcing identity through a modified machine axes taking into effect inclination of the drill tool in space. In the absence of any specific application, this algorithm is verified on Solid Works a commercial CAD tool and found to be correct. An example problem given at the end vindicates this statement.. This new algorithm can also be applied in the design of 2-link 6-DOF robotics manipulator or in CNC machining for contour generation on parts with part loading errors, or in orthopedic operations employing robotic manipulators to assist surgeons.