Flexible Shaft Drives and Accessories
General Information
Flexible shaft drives are multiple speed
The PFERD product range
Advantages
machines. They cover a wide RPM range
PFERD offers various types of flexible shaft
■Extremely compact and ergonomic
and can be adjusted steplessly electronically
drives as well as a comprehensive range of
handpieces.
or over gears to match individual tool require-
matching flexible shafts, handpieces, angle
■Extremely low-weight handpieces.
ments. Flexible shaft drives have an extremely
drives, drum and special drives.
■Extremely robust drives designed for per-
high power output. They can also be used
PFERD flexible shaft drives and their acces-
manent operation.
with the compact handpieces or extensions for
sories are extremely robust, technically up
■Technically up to date.
work in hard-to-reach places.
to date and are built according to the latest
■Extremely high power output.
ergonomic knowledge and specifications. This
■Extremely versatile.
Applications
programme was developed especially for the
■Simple power supply.
Flexible shaft drives can be used for almost all
economic use of grinding, milling, brushing,
■Low-maintenance.
jobs. They are used successfully in many indus-
cut-off and polishing tools and cover a wide
■Easy to service.
trial sectors for different processes. The RPM
range of speeds (0 - 40.000 RPM) and outputs
■Cost effective.
adjustment allows the use of various tools on
(500 - 2.700 watts).
one single machine.
Standards, safety, general guidelines
Electrical safety
3. Safety extra-low voltage/protective
PFERD electric grinders comply with the
PFERD flexible shaft drives comply with the
separation
■EC Machinery Directive
standard “Safety for Hand-guided Motor-
■When using AC voltage, in boilers, tanks,
■Low Voltage Directive
driven Electric tools“.
pipelines and similar narrow spaces made
■Electromagnetic Compatibility
of electrically conductive materials, a safety
1. Electric motor units with protective
extra-low voltage of 42 volts or protective
PFERD electric grinders bear the
earthing (class I)
separation must be used.
CE marking.
This constructional design accords with the
PFERD flexible shaft drives:
3.1 Electric motor units for safety extra-
Please observe any special or country-specific
■Mini-Mammoth Electronic
(page 71)
low voltage (class III)
regulations (e.g. on the use of safety extra-low
■Quint
(page 73)
These machines are operated with maximum
voltage).
■Mammoth Electronic
(page 75)
42 volts. The following are available in 42-volt
■Mammoth
(page 77)
models:
■Master Grinder
(page 79)
■Quint
(page 73)
■Mammoth
(page 77)
2. Totally insulated electric motor units
■Master Grinder
(page 79)
(class II)
This design feature is indicated by the insula-
3.2 Electrically protective separation
tion sign
and the supplement “SI“:
For flexible shaft tool drives, one alternative to
■RUER 5/250 SI
(page 69)
an extra-low voltage system is to isolate the
■RUER 10/250 SI
(page 69)
drive motor from the mains voltage using a
■RUG 19/120 SI
(page 69)
transformer of the same voltage rating.
■RUER 8/180 SI
(page 71)
Criteria for selecting the optimum flexible shaft drive
The most important prerequisite for cost effec-
3. Power output
tive work is the selection of an optimal tool.
The tool drive‘s power output is the deciding
Then a suitable tool drive can be choosen.
factor for maintaining the RPM under load.
Please take the following into consideration:
The load is determined from the material to
be machined, cutting capability of the tool
1. Design, shape and size
and the grinding pressure.
Every type of application places specific de-
mands on the shape and size of the tool drive.
4. Tool adapter
The different designs can be used for various
Depending on the PFERD tool you have select-
applications: The ideal drive should be selected
ed, different tool adapters are available e.g.
for the task in hand depending on the dimen-
collets or threaded spindles. Every machine is
sions, accessibility, type and frequency of the
allocated with matching collets. Please refer
application.
to pages 94-95 for an overview of the collets
and spindle extensions.
2. RPM
The tool drive should always be selected ac-
cording to the RPM and cutting speed recom-
mendations for the tool.
Please refer to catalogues 202 - 208 for these
recommendations.
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