33
Leica RM2255
In the quick clamping device of the directional specimen holder fixture, all specimen clamps
available as optional accessories can be used (implemented).
Directional fixture for specimen clamps
Orienting the specimen
Specimen blocks must not be oriented
during the retraction phase!
If a block is oriented during retrac-
tion, the block will advance by the re-
traction value PLUS the selected sec-
tion thickness before the next section.
This may cause damage to both speci-
men and knife!
•
Raise the object head to the upper end posi-
tion and activate the handwheel lock.
•
To release the clamp, turn the eccentric
lever (
29
) forwards.
•
Turn setscrew (
30
) to orient the specimen in
north-south direction. Turn setscrew (
31
) to
orient the specimen in east-west direction.
Each complete turn of the screw inclines the
specimen by 2 °. A total of 4 complete
turns = 8 ° are possible in every direction.
The accuracy is approximately ± 0.5°.
For ease of estimation, there is a white
marking on the handle and a notch point that
is noticeable during turning.
•
To lock the current orientation, turn the
eccentric lever (
29
) backwards.
Fig. 20
When the large standard specimen
clamp (50x55 mm) is used, the speci-
men orientation of 8° in north-south
direction is no longer possible.
The usable angle is only about 4° in
this case.
Display of the zero position
For better display of the zero position, the orien-
tation has two red indicators (
32
).
When both indicators are visible and both set-
screws (
30, 31
) are in zero position at the same
time (notch point, white marking on "
") the
specimen is in zero position.
5.
Operation
The directional specimen holder fixture may be
exchanged for a non-directional fixture
(optional accessory).
The object orientation allows for simple position
correction of the specimen surface when the
specimen is clamped into place.
32
30
32
31
29
