Starrett SR160, User Manual

Page: 30 / 180

30 PKG08761-UMSR160
ENGLISH
HOW MUCH DIFFERENCE DOES THE STYLUS TIP SIZE MAKE?
These instruments use a 200μin (5μm) stylus tip radius. This suits their
purpose as a portable tool for checking roughness in three ways:
• Durability – It is less likely to be damaged even when subjected to mishandling.
• Maintenance – It is easier to remove dirt and oil that collects on the
tip during use.
• Suitability – It acts as a filter to remove the highest surface frequencies
that are more reliably measured in a controlled environment.
Other Starrett instruments use a stylus with a tip radius of 80μin (2μm).
This smaller radius coupled with an inductive gage head having low
contact force enables analysis of even the smallest surface imperfections.
1. Stylus tip
2. Skid
3. Stylus movement (Z)
4. Measurement direction (X)
1.
3.
4.
2.
Note: roughness profile not drawn to scale
4.1IN (105mm)
2.7IN
(70mm)