Machine tools probe styli

Styli for machine tool touch probes to ensure maximum measurement accuracy

SILVERCNC provide various specifications of touch probe styli, with small deformation, stable quality and cheap price. Your best choice

Brand:                            SILVERCNC
Port:                               Shenzhen China

Logo printing:           SILVERCNC/None/Customized

Type :                             Straight, Cylinder, Extensions

Model :                          Standard or customized

Packaging details:      Carton
Shipping:                      DHL/TNT/UPS, 3-7 days

How a touch probe stylus works?

A stylus is the part of the touch probe which makes contact with the parts, causing the probe’s mechanism to displace and leading to trigger signal . The generated signal enables a measurement to be taken.Each touch generates a point that is defined using coordinate values in X, Y and Z. Feature, size, form and position can then be computed from these points.

The importance of styli for precision

The design and quality of stylus have a decisive influence on measurements in tactile metrology. If the roundness of the styli ball is poor, the position incorrect, the deformation of the ball and the thread tolerance is large, these will lead to the measuring rod large deformation. Any error may become an influencing factor of measurement uncertainty and may reduce the measurement accuracy by up to 10%

most frequently used stylus for probing applications on machine tools

Straight styli

Straight styli are the simplest and most frequently used type of stylus. Straight shouldered stems and tapered stems are available. Styli with tapered stems offer better rigidity when the work piece is easily accessible.
Stylus balls are made from ruby, silicon nitride, zirconia, ceramic or tungsten carbide.
The holders and stems come in a range of materials – titanium, tungsten carbide, stainless steel, ceramic and carbon fibre.

touch probe stylus

Cylinder styli

For measuring sheet metal, pressed components and thin work pieces with which proper contact cannot be guaranteed with ball styli. In addition, various threaded features can be probed and the centres of tapped holes located. Ball-ended cylinder styli allow full datuming and probing in X,Y and Z directions, thus allowing surface inspection to be performed.

machine tools cylinder styli


Extensions are used for measuring very deep features and bores, or probing points that are difficult to access.

machine tool styli extensions

What's the styli stem material defference

Tungsten carbide

Provides exceptional rigidity, particularly with small stem diameters and shouldered probes.With large stem diameters and long styli you need to be careful about the weight. Ideally suited for most standard applications.


Due to its lightness, ceramic is mainly used for long styli. It is thermally stable, for production-related pplications. It can also be used as a break protection in machine tool applications.


For styli with superior rigidity for standard applications where weight is not an issue.

Carbon fibre (thermally stable)

Also ideally suited for long styli as carbon fibre styli only weigh around 20% of tungsten carbide styli. Its thermal stability delivers huge benefits, particularly with very long styli and this makes it suitable for use in a production environment.

stylus models and price list

dimensions of styli

Ruby ball styli with tungsten carbide stems

ruby ball styli with tungsten carbide stems

Ruby ball styli with ceramic stems

Ruby ball styli with ceramic stems

Ruby ball styli with carbon fiber

touch probe ruby ball styli with Carbon fiber)

Flat bottom cylinder stylus wi th tungsten carbide

Flat bottom cylinder stylus tungsten carbide

Stylus extensions ceramic

touch probe stylus extensions(Ceramic)

Tips to Choice the right styli components and accessories

you should choose the machine tool probe styli according to the different machining materials. For example, when we measure relatively hard workpieces, we can choose stainless steel styli or tungsten carbide styli with better rigidity to ensure that probe styli will not be bent or the bending amount will be minimized in the detection and measurement. For another example, when measuring some machined parts of specific materials, we should always pay attention to avoid adhesion and wear between the probe and the corresponding materials. When measuring machined parts made of aluminum or cast iron, if selecting ruby probe , the phenomenon of adhesion and wear will appear on the measuring ball of the measuring probe, resulting in inaccurate measurement.

Secondly, choose the machine tool probe styli according to the measurement accuracy requirements . In general, the shorter the measuring rod, the larger the diameter of styli ball or the fewer the number of measuring styli components, the higher the measurement accuracy. Because if the measuring rod longer, it is likely to bend or deform, which will affect the measurement and detection results.the larger the diameter of the measuring ball can reduce the false trigger caused by the collision of the measuring rod during contact measurement, and it can also reduce the impact of the surface roughness.
Why choosing fewer assemblies probe is that when the number of probe assemblies increases, a connecting point will be added to the probe. The more connecting points, the more likely to lead to the bending of the rod. And components will lead to the allowable length and weight exceeding the standard, which will affect the measurement accuracy.

Finally, you should to choose the probe styli according to the actual vibration of the machine tool . In many cases, if does not consider these, which will often lead to the excessive vibration of the NC machine tool, resulting in the collision of the measuring . and when the measuring rod is broken , it will affect the measurement results. In general, if the CNC machine tool with large vibration, the carbon fiber probe with high-quality anti vibration performance should be selected instead of the ceramic styli with poor vibration performance