Instruction manual

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Thermo Scientific Rotary Microtome Microm HM 340 E

Microm International GmbH

part of Thermo Fisher Scientific

Otto-Hahn-Str. 1A

69190 Walldorf / Germany

387831 - English

3-7 SPECIMEN FEED

3-7-1 COARSE FEED AND SPEED FOR

COARSE FEED

After changing the specimen or moving the knife or

knife carrier, it is necessary to adjust the specimen

to the knife edge again. This can easily be done by

means of the specimen coarse feed and the

defined trimming values.

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 to the front as

long as the knob (fig. 18.2) for activating the

coarse feed forwards, i.e. in the direction of the

user, is turned.

• The feed speed is controlled via the turn angle.

When the knob is only slightly turned forwards,

the speed is slow. Turn the knob further

towards the front, the speed will be higher.

• To move the specimen holder backwards, also

turn the knob (Fig. 18.2) backwards, i.e. in the

opposite direction of the user.

• In this case, the swing angle from the zero

position on is also responsible for the coarse

feed speed.

• In case the knob is kept in its maximum turn

angle for more than two seconds, the

specimen movement automatically moves in its

rear end position after releasing the knob.

• Then the coarse feed motor turns off after

having reached the rear end position.

• When the front end position of the specimen

movement is reached, the red LED arrow on

the operating panel (fig. 19.2) lights up.

• When the rear end position of the specimen

movement is reached, the red LED arrow on

the operating panel (fig. 19.1) lights up.

• Press the knob (fig. 18.2) to release trim feed

with the selected value, even if the fine mode is

active.

Fig. 18

Fig. 19

Retraction

MEMO