Ground Ball Screws

{flickr|100|campaign} Ball screws are generally produced using one of two methods, grinding or rolling. Ground ball screws are a little bit harder to make and also more costly. These ball screw assemblies are commonly termed precision ground ball screws, and are manufactured through a three step process.
This method initially using machining technique to form the basic shape. Once this step is finished the maker must then enforce the ground ball screw by employed a method that is called case hardening. Case hardening essentially hardens the ball screw by fusing traces of a harder metal to its surface. During the case hardening stage, small amounts of this harder metal are fused into the surface of the ball screw, producing a harder alloy. This then makes a ball screw component that has a relatively soft core but an exceptionally hard outer shell.
After the case hardening stage is completed, the ball screw piece is then ground. Grinding is a metalworking technique that is often commonly referred to as milling. Milling machines are incorporated into the manufacturing process to give the ground ball screw a high level of precision. Milling machines are typically employed in any type of manufacturing that demands high levels of precision, and as a result of this they can produce ground ball screws that are exceptionally accurate.
When they are producing ground ball screws, metalworkers must bear in mind that high temperatures can can seriously affect the composition of the ball screw at particular stages of the process but are needed for other manufacturing stages. It is in fact because of this that ground ball screws must be produced in separate steps.
High precision ground ball screws have a high degree of precision, and can be trusted up to one thousandth of an inch per foot. It is an undisputed fact that ground ball screws have much better accuracy than rolled ball screws. A result of this is that they are much more expensive however.