Method and system for forming a workpiece

Abstract

A method for shaping a workpiece having a base portion using a tool is provided. The method includes rotating the tool at a fixed rotational speed in a first direction and rotating the workpiece in the first direction. The tool is positioned in contact with the workpiece at a first portion of the base portion of the workpiece. The workpiece is rotated at a first rotational speed when the tool contacts the first portion of the base portion of the workpiece. The workpiece is rotated at a second rotational speed when the tool contacts a second portion of the base portion of the workpiece. The first rotational speed and the second rotational speed are different.

1 . A method for shaping a workpiece using a tool, the workpiece having a semi-circular base portion, the method comprising:
 rotating the tool at a fixed rotational speed in a first direction;   rotating the workpiece in the first direction   positioning the tool in contact with the workpiece at a first portion of the semi-circular base portion of the workpiece;   rotating the workpiece at a first rotational speed when the tool contacts the first portion of the semi-circular base portion of the workpiece; and   rotating the workpiece at a second rotational speed when the tool contacts a second portion of the semi-circular base portion of the workpiece; and   wherein the first rotational speed and the second rotational speed are different.   
   
   
       2 . The method of  claim 1  wherein the first portion is located in a first half of the semi-circular base portion. 
   
   
       3 . The method of  claim 2  wherein the second portion is located in a second half of the semi-circular base portion. 
   
   
       4 . The method of  claim 3  wherein the second rotational speed is greater than the first rotational speed. 
   
   
       5 . The method of  claim 4  wherein the workpiece increases rotational speed at a constant rate between the first rotational speed and the second rotational speed. 
   
   
       6 . The method of  claim 5  further comprising the step of rotating the workpiece at a third rotational speed when the tool contacts a third portion of the semi-circular base portion of the workpiece. 
   
   
       7 . The method of  claim 6  wherein the third portion is located at an end of the semi-circular base portion. 
   
   
       8 . The method of  claim 7  wherein the third rotational speed is equal to the first rotational speed. 
   
   
       9 . (canceled) 
   
   
       10 . A system for shaping a workpiece, the workpiece having a semi-circular base portion, the system comprising:
 a rotatable mounting portion for receiving the workpiece therein, the rotatable mounting portion operable to rotate the workpiece;   a rotatable grinder positioned proximate to the mounting portion for contacting the workpiece;   a controller in communication with the mounting portion and the grinder, the controller having a memory with control logic, the control logic including a first control logic for rotating the grinder at a fixed rotational speed in a first direction, a second control logic for rotating the mounting portion in the first direction, a third control logic for positioning the tool in contact with the workpiece at a first portion of the semi-circular base portion of the workpiece, a fourth control logic for rotating the mounting portion at a first rotational speed when the tool contacts the first portion of the semi-circular base portion of the workpiece, and a fifth control logic for rotating the mounting portion at a second rotational speed when the tool contacts a second portion of the semi-circular base portion of the workpiece; and   wherein the first rotational speed and the second rotational speed are different.   
   
   
       11 . The system of  claim 10  wherein the first portion is located in a first half of the semi-circular base portion. 
   
   
       12 . The system of  claim 11  wherein the second portion is located in a second half of the semi-circular base portion. 
   
   
       13 . The system of  claim 12  wherein the second rotational speed is greater than the first rotational speed. 
   
   
       14 . The system of  claim 13  wherein the controller increases rotational speed of the mounting portion at a constant rate between the first rotational speed and the second rotational speed. 
   
   
       15 . The system of  claim 14  further comprising a sixth control logic for rotating the mounting portion at a third rotational speed when the tool contacts a third portion of the semi-circular base portion of the workpiece. 
   
   
       16 . The system of  claim 15  wherein the third portion is located at an end of the semi-circular base portion. 
   
   
       17 . The system of  claim 16  wherein the third rotational speed is equal to the first rotational speed. 
   
   
       18 . The system of  claim 17  wherein the controller decreases rotational speed of the mounting portion at a constant rate between the second rotational speed and the third rotational speed.