Ball screws and ball screw assemblies have been designed to be very accurate and are often referred to as precision ball screws. It should be noted that the levels of precision can vary, based on the exact ball screw design along with the production method. Generally, the least costly precision ball screws , because they production method is less precise.
The less accurate designs of of ball screws are the rolled ball screw assemblies. These ball screw assemblies have low levels of friction and are not very costly to make. However because of the rolling method that is employed they have lower levels of accuracy than other editions of ball screws. Precision ball screws produced through rolling are typically precise up to several thousandths of an inch in each foot.
High-precision ball screws are not the ball screws with the highest precision levels, but they are more precise than ball screws that are manufactured using the rolling method. They are more accurate because of the way in which they are produced, which is a combination of machining, case hardening and grinding. These are therefore types of ground precision ball screws, and have a precision level of at least a thousandth of an inch per foot.
The most accurate types of ball screw shafts are called instrument quality ball screws. These items are made with extreme care employed modern machinery with high levels of accuracy. Precision milling machines are commonly utilised to create these precision ball screws. Tools like these are generally utilised to create optical lenses, that must have extremely accurate measurements so as to be produced correctly. The instrument quality ball screw shafts are generally made out of Invar, as a result of this metal’s ability to sustain higher temperatures that would usually damage other metals. Instrument quality precision ball screws are generally precise up to 250 nanometers per centimeter.
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