“How do I probe this?” is a question frequently asked by CMM operators and machinists when faced with unusual workpiece features or properties. Often, a traditional ruby ball, carbide stem, and threaded base stylus won’t work. The solution is a special stylus. This article is an overview of some special styli that make up an important part of a CMM or machine tool toolbox.

Browse through any coordinate measuring machine (CMM) or machine tool stylus catalog, and you’ll see an array of available materials from which to choose.

Most coordinate measuring machines (CMMs) are sold with a stylus kit containing an assortment of ruby ball styli and associated tools