Mafell NFU 50, Translation Of The Original Operating Manual, Page: 26 / 174

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4.6 Indexable cutting insert change “adjustable
groove cutter”
Danger
Always pull the power plug before
making changes or adjustments.
Install and remove the cutters in
accordance with instructions in the
operating manual. Utmost caution
is mandatory!
Ensure clean clamping surfaces.
Observe the specified tightening
torques! The clamping screws must
be tightened only with the tools of
the same dimensions included in
delivery. No striking tools, levers,
extensions or other tools may be
used.
All blades must always be fitted in
order to prevent imbalance.
The adjustable groove cutter 30 (Fig. 5) is equipped
with 12 carbide indexable cutting inserts 32. If the
blades are becoming blunt, you can turn the
indexable cutting insert 32 (Fig. 5) three times. After
that, new original indexable cutting inserts must be
fitted!
Follow the procedure below:
 Remove the tool from the machine (see 4.5
Adjusting the milling cutter: Adjustable groove
cutter (optional accessories), page 25).

Loosen the countersunk screws 34 (Fig. 5) on
the tool with the wrench included in the supply.

Clean all parts and cutter chambers of the tool.

Turn the carbide indexable cutting inserts or
replace them with new carbide indexable cutting
inserts after they have been turned three times.

Fasten the turned or new indexable cutting
inserts with the countersunk screws and
retighten the screws with the corresponding
wrench (Fig. 7) with 4 Nm.
The two parts have been inserted correctly if the rear
of a cutter edge is resting against the carrier body
and the countersunk screw can be screwed in that far
that the surface of the countersunk screw is located
below or on the same level as the surface of the
indexable cutting insert (see Fig. 5).
5 Operation
5.1 Initial operation
Personnel entrusted to work with the machine must
be made aware of the operating instructions, calling
particular attention to the chapter "Safety
instructions".
5.2 Switching on and off

Switching on: Press the switch-on lock 7 (Fig.
1) forward to unlock it. Then, with the switch-on
lock depressed, press shift lever 8.
As this is a switch without locking device, the
machine will only run for as long as this shift lever is
pressed.
The built-in electronic system provides for jerk-free
acceleration when the machine is switched on and
under load readjusts the speed to the fixed setting.
In addition, the electronic system switches off the
motor in case of overload, i.e. the tool will stop.
Release shift lever 8. Then switch the machine on
again and continue milling at a reduced feed speed.

Switching off: To switch off, release the shift
lever 8 (Fig 1). The built-in automatic brake
limits the coasting time of the tool to approx. 3 s.
The switch-on lock takes effect again
automatically and secures the cross-cut milling
system against accidental switch-on.
5.3 Milling depth adjustment
The milling depth is continuously variable between 0
and 50 mm.
Follow the procedure below:

Press the push-button 11 (Fig. 2) and adjust the
milling depth with the plunge lever 6.

The milling depth can be read off the scale on
the cover. The area of plunge lever 6 with the
red background serves as indicator.
5.4 Milling depth locking device / repeater depth
stop
The milling depth locking device is used to lock the
set milling depth. After defining the milling depth
once, it can easily be set without measuring again.