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© Carl Zeiss 3D Automation GmbH14 ZEISS stylus Knowledge base The shaft We differentiate between a full-length shaft and an offset shaft. The offset shaft has the advantage of a slightly greater shaft thickness DS, that reduces towards the stylus tip. A disadvantage is the reduced available measuring range MLE with the shaft thickness DSE (As compared with DS and ML on a non stepped shaft stylus). The shaft material used for the shaft and the cross-section (solid material is stiffer than tubes) has a great influence on the stiffness of the stylus. The diagram provides an overview of the different material properties of styli. As you can see, ZEISS ThermoFit® styli represent an optimum of the three significant properties: stiffness, weight, thermal expansion in length. The fact applies to all styli, that they should be as bend-resistant as possible to be able to take up the measuring force as far as possible without deformation, the so-called stylus deflection. The shaft structure and the transition to the adapter into which the shaft is fixed is decisive in this matter. A stylus normally consists of three parts. Adapter, shaft and a stylus tip. Legend DK ball diameter in mm L length range in mm ML measuring length in mm DS shaft diameter in mm DG diameter of base element in mm MLE stepped measuring length in mm DSE stepped shaft diameter in mm B gauge / length of measuring cylinder, mm Adapter Shaft Stylus tip -25 25 ceramic CZ 100 Tungsten carbide CZ 21 CFK standard 21 ThermoFit 59 steel 0% 50 150100 200 Weight 100 % =Tungsten carbide CZ The adapter The adapter is the connection between the connection thread and the shaft. It is important that the adapter is designed in such a way that it can withstand the measuring force that is introduced via the shaft in an optimum manner. Otherwise there will be an increased scatter of the probe determinations. In addition, the connection point to the extensions is always undercut to ensure optimum force fit. Depending on the measuring system being used, ZEISS uses M2, M3 and M5 connection threads. Important! On XXT stylus systems you must not use normal M3 styli, but rather the optimized M3 XXT styli for passive scanning. As a result of the 1 mm larger diameter of the XXT adapter body and the high-strength titanium alloy used, significantly higher stiffness is ensured when compared to conventional M3 styli. M3 XXT M3 normal -25 0% 50 150100 200 100 Tungsten carbide CZ 107 ThermoFit Deflection 181 CFK standard 195 steel 135 ceramic CZ 100 % =Tungsten carbide CZ Thermal length change 115 ceramic CZ 100 Tungsten carbide CZ -15 CFK standard -5 ThermoFit 226 steel -25 0% 50 150100 200 100 %=Tungsten carbide CZ 0% 50150100200 -250% 50150100200 -250% 50150100200