RotoForce-4
Instruction Manual
19
2. Grinding
Grinding can be divided into two different operations: plane
grinding "PG" and fine grinding "FG". In the following, both steps
will be described and the best possibilities will be shown.
PG is used to get all specimens in a specimen holder into the
same level. Usually coarse abrasives like SiC papers or diamond
grinding discs are used to remove a large amount of material in a
short time.
FG is used to remove the deformation introduced during PG or
abrasive wet-cutting, and to produce specimens with a surface
ready for polishing. We recommend one-step FG like the new
MD-Allegro, DP-Plan or DP-Pan.
Do not use plane grinding with coarse abrasives when preparing
single specimens. It is normally not necessary, and the use of
coarse abrasives can result in unplane specimens.
If, for whatever reason, it is necessary to grind using coarse
abrasive, the planeness may be improved by carrying out the
following:
The height of the specimen should not exceed 0.7 x specimen
diameter.
Example:
A specimen with a diameter of 30 mm
should not be higher than 30 x 0.7 = 21 mm.
Use as small a grain size as possible.
Use a mounting resin with a wear resistance similar to the
specimens wear resistance.
Use 150 rpm for both grinding disc and specimen mover.
Use COUNTER ROTATION
R
on RotoForce-4.
Use low forces.
Position RotoForce-4 so that the specimens do
not
go over the
centre of the preparation disc.
Plane Grinding
Specimen Holders
Fine Grinding
Specimen Movers/
Specimen Mover Plates
Recommendations
Summary of Contents for RotoForce-4
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