KRESS FM 6955 Instrucciones De Servicio página 8

Always select feeding direction of work against direction of
rotation of cutter (up-cutting):
Attention!
Never employ down-cutting!
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Free-hand work
The milling and grinding motor is ideally suited to many
kinds of free-hand work due to its small size and light
weight. The handle (15) (special accessories) makes it easy
to use.
Attention! Always wear safety goggles! Switch off
motor immediately at end of work as a safety measure
against injuries!
Use only routing, drilling, polishing and grinding tools
licenced for high-speed operation (30 000/min.)
Sanding/grinding jobs
When using routing and grinding motor for manual sanding
and grinding jobs, make sure that a circumferential speed
of 45 m/s is not exceeded.
The circumferential speed is calculated as follows:
V = d · π · n
60 000
V = Circumferential speed m s
d = sanding/grinding wheel dia. in mm
π = 3.14
n = idle speed of routing and grinding motor in rpm.
Example: Diameter of sanding/grinding wheel is 25 mm:
V = 25 · π · 24 000 m = 31.4 m
60 000 s
The permissible maximum speed is not exceeded.
The maximum permissible circumferential speed is at-
tained at a sanding/grinding wheel diameter of 30 mm.
Do not use larger wheels.
Make sure that
- the sanding/grinding wheels used are ceramic or resin-
bonded
- you store sanding or grinding wheels in such a manner
that they cannot be damaged (cracks in wheel, damaged
tool shanks etc. are dangerous to operator)
- prior to using new sanding or grinding wheels, a test run
of at least 5 minutes without load is performed.
Working with flexible shaft
Thanks to its high speed the routing and grinding motor is
also excellently suited for driving a flexible shaft.
Permissible idle speed of the flexible shaft must be
adapted to the idle speed of routing and grinding mo-
tor.
Attention! Wear safety goggles!
Full-wave control electronics with electronic motor
protection monitoring (safety electronics)
The following advantages are integrated into the full-wave
control electronics with built-in motor tachogenerator:
s
Gentle warm-up
Limitation of starting current reduces the inrush current.
The motor starts up slowly until reaching the preset speed,
thus protecting the user and prolonging the life of the ma-
chine.
Electronic overload protection
The speed of the milling motor is reduced by the integrated
motor monitoring should the load become too high for the
motor. The load on the machine must be reduced. Ideally,
the machine should be removed from the work piece
briefly so that full capacity is regained.
Electronic control with tachogenerator
The full-wave control electronics makes possible a large
control range of 8000 - 26 000 rpm
provides power reserve under stress. The pre-set rotation-
al speed remains constant. By using the full-wave control
electronics' adjustment dial (16), the optimal cutting speed
or working rotational speed can be adjusted regardless of:
- material (hard woods, soft woods or plastics)
- milling or grinding tool (small diameter, lower or higher
quality).
- The required cutting or working rotational speed de-
pends on many factors (varying degrees of hardness of
the material being machined, milling quality, infeed, etc.).
The optimal adjustment must be determined by trial and
error when beginning work.
Caution!
Very high speeds mean rapid wear and a short working
life for your tools!
Important! Use only sharp and well-preserved cutting
tools! Best of all use our original cutting tools!
When using other cutting tools the speeds per minute
which have been durably marked by the manufacturer on
the turning tools must not be exceeded!
Replacing carbon brushes
Our service personnel will do this and all other servicing
work quickly and professionally.
Mains cable
Damaged mains cables must not be used. They are to be
replaced immediately.
This has been made very straightforward by the new mains
cable module (17). Press both locking keys (18) and pull the
mains cable module (17) out of the handle. Insert the new
mains cable into the handle and lock in place. Different
lengthed mains cables are available as special accessories.
Only use the mains cable module for KRESS power tools!
Do not attempt to operate other electrical appliances
with it!
Motor, cleaning and care
The powerful universal motor has adequate power
reserves. For a long life, be sure to blow dust out of hous-
ing after each job. The vent holes should always be kept
unobstructed and clean since uniform ventilation is ex-
tremely important. The machine is lubricated for life and
widely maintenance-free.
Tool care
Make sure that only well-maintained cutting tools are used.
This will protect the motor and extend the life of the ma-
chine. Carbide-tipped cutters require special, careful treat-
ment since the cutting edges are easily subject to chip-
ping.
To eliminate any risk of injuries, the use of damaged cut-
ting, grinding and polishing tools on our high-speed cutting
and grinding motor is no longer permitted.
. The tachogenerator
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