M3 RENISHAW, Disc styli, silicon nitride disc, carbon fibre shaft

Disc styli are used, among other things, to measure rotationally symmetrical workpieces with undercuts or recesses and bores. However, a strong filtering of the surface roughness usually occurs. With the design of the sphercial disk stylus, a higher accuracy is achieved compared to disk styli.

Carbon fiber shafts represent an optimum combination of stiffness, weight, and thermal linear expansion. This makes them particularly suitable for long styli and demanding measurement tasks, such as in production with constantly changing ambient temperatures. They are also ideal for magnetic applications. The straight shaft is the simplest stylus design and the one with the longest usable length. The full shaft length can be used as measuring length. Carbon fibre shafts have the best thermal behaviour and the lowest weight, but a little less stiffness.

Silicon nitride styli are just as universally applicable as ruby styli. However, they show less material deposits when scanning aluminum or other soft materials. This does not mean that there iare no deposits here. SiN spheres also shows this problem, the effect only occurs at a later point in time in the process. Due to the almost identical hardness compared to ruby, SiN spheres are equally susceptible to material removal when measuring hard, abrasive materials.