PH20 stylus selection
NOTE: Choosing the best stylus for a given application is an important factor in achieving optimum probe performance. For further information on the full range of Renishaw styli, please refer to Renishaw's styli and accessories brochure (H-1000-3200) which can be ordered from your supplier or downloaded from Renishaw's web site, www.renishaw.com.
When selecting a stylus, it is important that the stylus length is kept to the minimum required to access all features to be measured, and that the stylus type offers the maximum possible stiffness. Factors that affect stiffness are:
It is also important to ensure that the stylus ball diameter chosen is as large as is practical. This not only ensures that the stylus will be as stiff as possible, but also reduces the stylus's susceptibility to surface form and surface finish.
Owing to the modular construction of the TP20, when selecting and using styli the following criteria should be applied:
Recommended stylus limits
Owing to the modular construction of the TP20 probe, it is recommended that the limits shown in the following figures are applied when selecting styli to be used.
The low force probe module
The low force probe module has the following recommended stylus limits:
The standard force probe modules (SF, EM1 and EM2)
The standard force probe modules (SF, EM1 STD and EM2 STD) can be used with the following range of styli:
The medium force probe modules
The medium force probe modules have the following recommended stylus limits:
The 6-way probe module
The recommended stylus limits for the 6-way probe module are:
Comparative stylus lengths
A comparison of the minimum and maximum stylus lengths for use with each probe module is shown below: