The stylus is an integral part of the measurement system that is in contact with the workpiece being tested to cause displacement of the probe mechanism. The resulting signal is processed to obtain the result. The shape of the workpiece to be measured will determine the type and size of the stylus to be used. In all cases, the large stiffness of the stylus and the sphericity of the ball are critical.
Ball material properties |
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| Stylist type | Material | Level | Sphericity | Structure | Ingredient | Purity | Density | Hardness | Compressive strength | Bending strength | Fracture toughness |
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（μm） | ﹣ | （wt%） | (%) | (g/cm3) | HV | (MPa) | (MPa) | (MN/M3/2) |
| Alumina Ruby ball | Artificial ruby single crystal | Level 5* | 0.13 | Single crystal | 99%Al?O? | 99.90 | 3.90 | 1800 | 2100 | 390 | 1 |
| Silicon nitride Measuring ball | Hard molding Si?N? | Level 5* | 0.13 | Polycrystalline | Si?N? | 90 | 3.0-3.2 | 1600 | 3000 | 1000 | 6 |
| Zirconia Measuring ball | sintering ZrO? | Level 5* | 0.13 | Polycrystalline | ZrO? | 90-95 | 6.05 | 1200 | 2000 | 700-1100 | 10 |
| Alumina Hollow ball | ceramics Al?O? | ﹣ | 1 | Polycrystalline | Al?O? | 99.80 | 3.8-3.9 | 1570 | ﹣ | ﹣ | ﹣ |
| Silver steel disc stylus | Silver steel | ﹣ | 1 | ﹣ | ﹣ | ﹣ | 8 | 450 | ﹣ | ﹣ | ﹣ |
| Silver steel simple cylindrical stylus | Silver steel | ﹣ | Roundness 4μm | ﹣ | ﹣ | ﹣ | 8 | 200 | ﹣ | ﹣ | ﹣ |
| Ruby cylindrical stylus | Artificial ruby | Ball level 5* |
Ball sphericity：0.13 Concentricity：Measuring ball/Cylindrical 4μm |
Single crystal | 99%Al?O? | 99.90 | 3.90 | 1800 | 2100 | 390 | 1 |
| Tungsten carbide cylindrical stylus | Tungsten carbide | ﹣ | +20μm Tip radius | ﹣ | 92-93.5%WC 6.5-8%CO | 14.8 | 14.95 | 1550 | 6000 | ﹣ | ﹣ |
| Silver steel tip stylus | Silver steel | ﹣ | Cone angle 30° | ﹣ | ﹣ | ﹣ | 8 | 300 | ﹣ | ﹣ | ﹣ |
| Tungsten carbide stylus | Tungsten carbide | ﹣ | Cone angle 30° | ﹣ | 92-93.5%WC 6.5-8%CO | 99.90 | 15 | 1550 | 6000 | ﹣ | ﹣ |
| Alumina hollow ball | Aluminum alloy 6082-T6 | ﹣ | 30μm | ﹣ | 95.2-98.3%Al | ﹣ | 2.7 | 95 | ﹣ | ﹣ | ﹣ |
Rod material properties |
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| Material | Expansion coefficient at 25 ° C |
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| stainless steel | 16x10??／℃ | ||
| Tungsten carbide | 5x10??／℃ | ||
| Ceramics | 8.1x10??／℃ | ||
| Carbon Fiber | -0.4x10??／℃ | ||
| Titanium | 9.2x10??／℃ | A-- Ball diameter | φ M2=3mm |
| Ruby | 4.5x10??／℃ | B-- Total length | φ M3=4mm |
| Silicon nitride | 3.2x10??／℃ | C-- Rod diameter | φ M4=7mm |
| Zirconia | 10.5x10??／℃ | D-- Effective working length | φ M5=10mm |
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