A valve train systems manufacturer was using a hollow, machined rod in the assembly of a valve assembly. This component makes the link between the plunger and the spool. These are the components that allow the assembly to complete a cycle. Due to the fact that the rod is the link between the plunger and spool, it is a very critical component. One of the requirements of this product (used as the link) is that oil needed to pass through the ID of the part.
The machined component had a solid wall with a hole drilled in its center. Due to the fact that it was stainless steel, the run time to produce a single component was extensive. Even though the machined component met the performance requirements of the application, the customer wanted to reduce the cost of this expensive rod.