Instruction manual

Rotary Microtome HM 355 S
MICROM International GmbH
Robert-Bosch-Str. 49
D- 69190 Walldorf
The graduation of the trimming thicknesses is
divided into 4 ranges:
range graduation
up to 10µm 5µm
from 10µm to 100µm 10µm
from 100µm to 200µm 20µm
from 200µm to 500µm 50µm
2-5 SPECIMEN FEED
2-5-1 COARSE FEED AND SPEED
FOR COARSE FEED
For the fast forward and backward travel between
specimen and knife edge, the microtome has a
motorized coarse feed system. The specimen
holder is moved forwards as long as the button
<coarse feed forwards> (fig. 5.16) is pressed. To
move the specimen holder backwards, press the
button <coarse feed backwards> (fig. 5.15).
The instrument carries out movements of various
lengths according to how long the button (fig. 5.15)
is pressed. Press the button (fig. 5.15) only very
briefly and the specimen holder moves backwards
by a fixed value of 2 µm. If the button (fig. 5.15) is
pressed a little bit longer (not longer than 2
seconds), the specimen holder moves backwards
as long as the button (fig. 5.15) is being pressed. If
the button (fig. 5.15) is pressed for more than 2
sec., the specimen holder moves automatically to
the back end position and the motorized coarse
feed shuts off. This function can be stopped at any
time. For this, shortly press the button (fig. 5.15)
again.
When the back end position is reached, the red
LED in button (fig. 5.15) lights up.
When the front end position of the specimen
movement is reached, the red LED in button (fig.
5.16) lights up.
Three different speeds for the coarse feed are
available: 400, 800 and 1200 µm/s. The three
different speed settings are shown on the display
(fig. 5.7) on the right side in the third line as
follows:
* = 400 µm/s
** = 800 µm/s
*** = 1200 µm/s
To select or change the speed, press button <speed
coarse feed> (fig. 5.13) until the required speed is
shown in the third line on the right side of the
display (fig. 5.7).
CAUTION! With the function <coarse feed
forwards> specimen and knife edge are adjusted
very quickly. To avoid damage to specimen and
knife, carefully observe this adjustment process.
Take note that the specimen and knife edge do not
come in contact with each other. Carefully observe
the narrowing gap between specimen and knife
edge to stop the function <coarse feed forwards>
in time before the specimen touches the knife edge.