Gatan 656, User Manual, Page: 16 / 49

Description
6 Dimple Grinder User’s Guide
Figure 4 Wheel position alignment.
Grinding Wheels
The grinding wheels are phosphor bronze, available with spherical or flat edges.
The spherical-edged wheel permits more accurate positioning of dimples and
produces a spherical profile with a smaller thin area. This wheel is more suited
to fragile or brittle specimens, such as ceramics and semiconductors.
The flat-edged wheel produces flat bottomed dimples with larger thin regions
and is better suited to tougher specimens, particularly metals.
Wheels come in different sizes. The small wheel preserves a wide, thick rim
around the thin area for fragile specimens and produces steep profiles for analy-
sis. The large wheel prepares bulk specimens for larger thin areas. All wheels
are interchangeable.
Note: The grinding wheels wear and are considered consumable items.
Polishing Wheels
The polishing wheel consists of male and female parts that hold a central felt
polishing ring (see Figure 5).
Standard
grinding wheel
contact point
Specimen
Specimen
rotation
axis
Pivot point
of rotating
grinding arm
Large
grinding wheel
contact point
Standard
grinding
wheel
Large
grinding
wheel
β
Specimen
mount