“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.