EoW May 2009

31 / 108

EuroWire – May 2009 29
english technology news
Gauder Group has announced the
extension of Maillefer’s contract to
represent its range of new rotating
machines in all CIS countries.
Well-known for many years by Pourtier
and Setic customers throughout
the Russian Federation, Ukraine and
Belarus, Maillefer SA Moscow is from
now on the representative office
for Armenia, Azerbaijan, Georgia,
Kazakhstan, Kyrgyzstan, Moldova,
Tajikistan, Turkmenistan and Uzbekistan
markets as well, in direct collaboration
with Philippe Letout, sales manager for
rotating machines.
Gauder Group – France
Fax: +33 1 64 26 61 10
Email:
Website:
Maillefer representative office – Russia
Fax: +7 495 362 60 41
Email:
Website:
New appointment for
CIS countries
Model RSC is designed to give an even, finely dosed and
dust-free powdering of talc, stearate, lac powder or swellable
powder to cables and wires.
Strong adhesion and even surface layer is achieved by the
electrostatic charging of the powder. The electrostatic also
ensures that no powder will fall from the product after leaving
the dusting chamber. Depending on extrusion speed and
product diameter, up to four powder guns of 100 kV each are
used.
Schlicht machines can handle product diameters up to
160mm, manufactured to the user’s desired extrusion speed
and diameter.
Inside the machine is a fluidised powder hopper from which
the powder is sucked by pneumatic venturi pumps and blown
to the guns. For adjustment of the powder quantity the power
of the electrostatic charge can be adjusted from 0kV to 100kV,
as can powder quantity and dust cloud speed. Nozzles on the
powder gun can be changed to suit the product. An extra-fine
dosing device is available as an option.
The machine features a fully automatic and maintenance-free
filter system, allowing a strong and constant vacuum in the
machine; no powder escapes into the environment.
Hoses can connect a freestanding dusting chamber to the
machine.
Rolf Schlicht GmbH – Germany
Fax: +49 40 6799 4211
Email:
Website :
Electrostatic powder coating
When developing its drive nut, Uhing
conceived a non-positive linear feed
element that is successful as a drive
element in measuring machines.
“The secret is its lack of play, a feature
that is fundamentally inherent to the
construction of the drive nut,” explains
Uhing’s head of marketing, Wolfgang
Weber.
Drive nuts have three or four rolling rings
alternately pushed against the surface of
a plain shaft by spring force. These rings
connect to the shaft by friction. Skewing
the rolling rings results in their rolling
off on the surface of the rotating shaft
at their pitch angle, thus generating a
linear movement. This results in drive nut
and shaft acting like a nut and threaded
spindle.
The spring force required to produce
the frictional connection automatically
reduces the theoretically existing play
to zero, so there is no detrimental effect.
The drive nut instantly translates the
smallest back and forth rotation of the
shaft into a movement to the left or right
because there is no system-inherent play
to overcome.
The pitch of the drive nut varies in
relation to the actual shaft diameter,
which is never constant over the entire
stroke because the feed distance per
shaft revolution depends on the shaft
diameter and the pitch angle of the
rolling rings. The actual position of
the drive nut must be monitored with
a precise length scale in a measuring
machine, which is standard equipment in
such machines.
“A release option, operated manually or
pneumatically, is an additional advantage
for tool adjustment devices,” advises
Wolfgang Weber.
“Once the drive nut has been uncoupled
from the shaft, literally meaning the
shaft has been released, the tool or
measuring instrument is quickly moved
by hand. This prevents damage to
delicate components during test sample
exchange, and measuring as such is
speeded up.”
Joachim Uhing KG GmbH – Germany
Fax: +49 4347 90640
Email:
Website:
Drive nuts for measuring machines