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Outline

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
Stylist type	Material	Level	Sphericity	Structure	Ingredient	Purity	Density	Hardness	Compressive strength	Bending strength	Fracture toughness
			（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	﹣	﹣	﹣

*Refer to DIN-5401, ISO3290 and AFBMA 3290 ball level standards
*3-level sphericity ball available upon request

Rod material properties
Material	Expansion coefficient at 25 ° C
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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Renishaw stylus specifications

Ball material properties

Rod material properties