Overview
Contact rolling bearing elements come in a variety of different
shapes, including spherical, cylindrical and conical (taper roller).
The running performance and noise generation of bearings is to a
large extent dependent on the precision of the rolling elements.
Typically the surface finish characteristics of rolling elements
has a greater effect
on the
noise generated by a bearing than the surface finish of the tracks.
The
form and surface finish of rolling elements is critical to the
running performance and noise characteristics of any contact
roller bearing. Taylor Hobson have a range of Form Talysurf
systems which are suitable for measuring the form and surface
finish characteristics of rolling elements. For details
see the Form Talysurf links below.
Also
of critical importance is the roundness and waviness of the
rolling elements. Typically these features are measured using
roundness instruments as detailed in the Talyrond
links below.
Talysurf
CCI Systems
Nanometric areal surface texture and groove analysis on hard disc
drive bearings.
Form Talysurf
Inductive systems Small
capacity systems for accurate measurement of surface texture and geometrical
features on rolling elements.
Talyrond
290 / 280 range Large
capacity systems for highly accurate measurement of roundness and
harmonics on rolling elements.
Talyrond
365 / 240 range Medium
capacity systems for highly accurate measurement of roundness and
harmonics on rolling elements.
Talyrond
100 range Small
capacity systems for accurate measurement of roundness and harmonics
on rolling elements.
Taylor Hobson have also developed a special fixturing device
called a “ball unit” which can used with any Form
Talysurf Inductive system to measure the surface finish of cylindrical
and ball rolling elements. It works by using a friction pad
to rotate a rolling element over a stationary inverted inductive
gauge. The gauge range used is very small so the inductive gauge
can be set to a high resolution setting and as such it can achieve
very low surface finish measurements (<6nm Ra is feasible).