Missler is a well known manufacturer of band saws.
developed a new technology that power drives two wheels.
result, a back-cutting tungsten carbide band-saw blade can cut
through highly resistant materials, including metals.
Transmission of the power needed to drive the blade occurs
through a friction-belt acting on the half circumferences of two
Missler has become the sole supplier of effective and
innovative solutions in the band saw market.
Missler is launching
a new generation of metal-cutting band saws.
range (340, 410, 540 and 720) now has a "GTI" version
which uses the new process to double the power transmitted to a
band saw blade.
Traditionally, band saws used one powered wheel
to drive the blade, with the other wheel rotating freely, serving
as a return pulley and maintaining tension in the band.
tension, then, has two functions.
It ensures the rigidity of the
blade, providing it with a good cutting geometry, and allows the
blade to be friction driven on the half circumference of one
This technique has proved satisfactory to
Progressively, the use of blades with tungsten carbide
coated teeth has become common for high-speed use.
This has had
two major advantages - both the output and the power of the
machine can be doubled.
But this is where the traditional system
finds its limitations, for even if the power is doubled, the
friction drive actually limits the machine's performance.
The solution lies in powering both driving wheels and creating a
friction surface equal to the full circumference of a wheel.
lack of synchronisation between the two wheels, usually caused by
manufacturing tolerances in wheel diameter, is easily compensated
As both motors are controlled by the same frequency
converter, a phenomenon of "slippage" occurs from the
motor bearing the greater load to the other.
The load is
distributed evenly between the two motors to within a tolerance
of about 5%.
The high rigidity of the machine structure, the
special mounting of the wheels, centred between two roller
bearings, and the use of hollow shaft reducers, provide
The advantages of the dual powered wheel
design are: - an increased productivity of up to 70 % with the
same blade due to an increase in power; - a significant decrease
in noise levels; - an increase of up to 100% in the working life
of the blade.
Three machine configurations are available: - The
Standard configuration comes with a VersaMax Micro PLC.
operator can control bar feed using a control wheel which has a
The control panel contains all the keys and
handles needed to control the machine during or before the
The number of cuts can be pre-selected with a
From 1 to 10 repeat forward movements for a
length can be programmed with a coding wheel.
A warning light
identifies reasons for machine stoppage for problems such as
blade breaking, lack of lubricant, end of bar, etc.
Intermediate configuration comes with a VersaMax Micro PLC and
VersaMax DataPanel operator interface (OI).
This has a numerical
positioning device covering all machine functions.
Up to 99
sequences of different lengths and quantities can be programmed.
It automatically manages multiple indexing for pieces longer than
the bar-feed stroke (up to 999.9mm).
The cutting length can be
programmed and the pieces for the first cut automatically
A back-lit LCD screen provides the operator with
clear instructions during programming and clearly indicates
reasons for a machine stoppage.
A gauge permanently records the
- The advanced configuration has a GE Fanuc 90-30 PLC
and CIMPLICITY HMI software.
With this version, a touch screen
acts as an ergonomically-designed OI combining all controls It
provides easy access to complex operations, displaying for the
operator only those (virtual) keys which are applicable to the
work in hand.
A customisable materials catalogue contains the
cutting conditions for each type.
A "shapes" catalogue
lets the operator define the sawing section.
The function allows
the machine to make automatic corrections to the cutting and feed
speeds based on the thermal effect generated by the blade length
in contact with the material at a given depth.
During the sawing
operation, a control screen traces theoretical and real forward
movement curves, the deviations providing an evaluation of the
quality and state of the blade.
The "blade management"
module automatically adjusts sawing conditions during the
It also provides statistics on productivity
and blade life.100 programme sequences of quantity/length allow
looping to combine overlapping lengths and minimise offcuts.
of the sawing machines manufactured in France by Missler are
Consequently, machines may operate thousands of
kilometres away, often in very difficult environments.
sawing generates dust and creates vibrations.
power supply can fluctuate due to the use of other machines on
the same premises.
Missler therefore must work with partners who
can respond to customers anywhere in the world in cases of
breakdown or malfunction.
GE Fanuc provides technical support
services throughout the world.
Its software and hardware
technical support provides advice on the use of products and
It can also assist with problems of
communications between peripheral devices.
The VersaMax Micro is
This is a significant advantage in linking PLCs to
All equipment offered by GE Fanuc is designed with
open standards guaranteeing connectivity with almost any I/Os
available on the market.