Page 207 - oxcatalog-2019

Troubleshooting

Improving your expertise
A diamond segment is like a ‘living being’. Its performances
at a certain time will tremendously depend on how it has
been used previously. Here are some basic facts about the
diamonds of the cutting edge:

Microscope view of a diamond segment’s cutting edge: visible
diamonds are not all ‘active’. Some are just starting to appear, some are worn
out.

The diamond is active and it is still intact. Its edges are well
exposed and it is properly maintained in the metal bond thanks to the ‘comet
tail’.

In this case, the diamond is wearing out on its exposed edge. This is good as it
remains aggressive.

On this picture, the exposed edges are getting rounded, which is bad because
it will reduce the global cutting performance of the segment. This will happen
when the diamonds are not subject to a sufficient pressure.

In the extreme case, a lack of pressure on the diamonds will lead to them pol-
ishing. At this point, the tool is not cutting anymore.

This ‘broken flat’ diamond is not active anymore. This is generally due to an
excess of specific pressure (too low RPMs or too high feeding pressure).

Another possible effect of a too high specific pressure or of an ‘unadapted tool
for the job’ is the ‘sinked’ diamonds. The diamond is simply pushed in the (too
soft) bond.

The OX Book 2019 Edition 1 Page 207