IKA MF 10 basic - Manual (Page 21)

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The ground material which has prepared to the
correctfeed grain size is fi lled into the funnel and
then the cover Pos. P 17 is applied. The speed knob
Pos. A 12 is turned to the left stop (3000 rpm).
The mill is started by shifting the rocker switch
Pos. A 13 to Position 1. First the green „Power“
LED is lit and then „Overload“ LED lights up briefl y
before the motor smoothly starts. The speed can
be set by turning the speed knob to the desired
speed. A speed of more than 4500 rpm is recom-
mended for impact grinding.
Now the ground material can be metered by tur-
ning the dosing sluice Pos.P6 in a clockweise di-
rection. You can hear if ground materials gets into
the grinding chamber and if too much materials
has been metered then the rotor speed decrea-
ses. This drop in speed is clearly indicated by the
lower grinding noises and the orange „Overload“
LED lights up. Metering of the ground material
should only be resumed when the speed has re-
turned to the adjusted value or if the „Overload“-
LED is no longer lit.
If this is done then the mill becomes overloaded
and switches off after some time because of over-
heating. This is then indicated by the red „Error“
LED. In addition, a beep sounds to indicate that
the millshould be switched off using the rocker
switch Pos. A 13. The mill must then cool off for
a period in order to be able to start in again (see
chapter "Eliminating malfunctions").
In addition, the ground material is no longer cut
up the lower speed when the unit is operated with
an overload because the impact energy no longer
suffi ces for breaking the ground material. Keeping
the ground material in the grinding chamber and
the ground material to heat up. In extreme cases
this can result in the ground material caking on
the grinding chamber parts which then entails a
time-consuming cleaning operation.
If the funnel is empty then the mill remains tur-
ned until all of the ground material from the grin-
ding chamber is in the container. This is the case
if cutting up noises can no longer be heard.
When it comes to cleaning the grinding cham-
ber experience has shown that it makes sense to
briefl y switch the unit to maximum speed after
the grinding operation has been completed and
only then to turn the speed knob to the left stop.
The mill is then shut off with the switch. The fi lter is removed after opening the grinding
chamber door and any remaining ground mate-
rial is wiped into the collecting pan.
Caution: After longer grinding cycles the grin-
ding chamber and the fi lters may have an increa-
sed temperature. Protective personal equipment
should be worn in this case.
It may help to crush the ground material in ser-
veral steps, i.e. a fi lter with large perforations is
used for pre-crushing and fi ner ones in each of
the following steps. (see fi g. 4).
Advantages:
• Fewer failures, e.g. due to clogged fi lters or
overloading the motor.
• Less heat-up of ground material since the re-
tention time of the ground material in the grin-
ding chamber is substantially reduced.
• Closer grain size spectrum for the fi nal material.
• Normally less total grinding with better results
as despite several runs comminution is perfor-
med more quickly and more effectively.
Disassembling the impact grinding head:
Before disassembling the head of the mill, the
mill itself must fi rst cool down as the grinding
chamber and the beater rotor cannot detached
otherwise.
The power supply plug must be disconnected
before disassambly. After opening the door,
the countersunk screw, P 15, is loosened using
an Allen key, while the rotor is held by the face
spanner that is included in delivery. The spanner
is positioned so that the pins of the spanner are
inserted into the bore holes on the face of the
rotor. The disc must be turned so that the bore
hole in the rotor is accessible for the spanner
pins.
If the hexagon socket is dirty then it must be clea-
ned by means of a brush. After the countersunk
screw and the disc, P 11, have been removed
the hammer rotor, P 13, is removed. The adjust-
ment spring must be in the area of the opening
(in the back wall of the mill chamber). Now the
three screw mountings Pos. P5 are loosened by
means of a fork wrench and the grinding chamber
is rotated in a clockwise direction and taken off.