During turning, the neck of a workpiece is ​three-lobed deformed due to the clamping pressure on the gripping jaws. While the workpiece is deformed, the machining tool will cut along a preprogrammed circular path. After removal from the chuck, the material returns to its original shape thus deforming the circular path. This means the processed part is no longer circular, as it should be.

Typically, this type of problem is usually solved by changing the fixtures (jaws) or adjusting the clamping pressure. This thesis takes a different approach that is based on creating a compensated toolpath that follows the workpiece deformation. This can be a much faster and cheaper way to solve the problem and the technique can be applied to other cylindrical workpieces.

The main results of this thesis are a methodology to address the deformation problem as well as suggested changes to the manufacturing process for the workpiece. This involves in particular a change from turning to milling in the last manufacturing stage involving fine machining.