2017 International Forest Industries Magazines May 2017 SHOW Special | Page 47
HewSaw dx -Revolutionizing the
This new four arbour dx sawing process from HewSaw
provides major benefits for modern sawmills, including
maximizing speed and recovery.
HewSaw’s latest technology breakthrough was
introduced in October 2016 and it will be showcased at
HewSaw’s stand at Ligna 2017 in Hannover, Germany
from May 22 to 26. HewSaw will have a cant saw with
dx sawing on the stand and HewSaw representaves will
be on hand to explain the new technology. You will find
the HewSaw stand at Ligna in Hall 25, Stand D24.
Based on the needs of today’s sawmillers, HewSaw’s in-
house enginnering team developed the new dx Sawing
at the company’s headquarters in Mäntyharju, Finland.
It has been tested at sawmills in Finland and the USA
and is now available to HewSaw customers worldwide.
“When we equip our HewSaw sawing machines and
sawlines with this patent pending technology, we can
provide our customers with the ability to run larger
diameter logs at faster speeds for longer periods of
time, and we can reduce our saw kerf, increasing
recovery and yield from each log,” explains HewSaw’s
chief engineer, Raimo Karjalainen.
Below: With HewSaw dx
sawing, the saws are cutting through the cant
in two stages, resulting in a reduced depth of cut.
The basic principle behind dx sawing is to replace the
standard double arbour sawing technique currently
used by HewSaw with a four arbour system. The first
set of arbours will house the saws for an initial or pilot
cut into the cant, while the second set of arbours will
house a set of saws that will finish the cut, just as it is
in existing HewSaw sawing technology. This works well
with HewSaw’s philosophy of centre line sawing where
all processing is calculated and alligned to the centre
line of the HewSaw machine.
In a typical HewSaw dx sawing scenario, the log is
presented in the usual way to the HewSaw scanning
conveyor, and following scanning, it is then positioned
for the HewSaw with the company’s highly accurate
log positioner followed by four sided chipping. The
next step is where it gets interesting, as the first set
of saws penetrates part way into the cant, making
the preliminary or initial cut. Then downstream is a
second set of saws on a second set of arbours, which
completes the sawing process. This is combined
with the edging of sideboards to produce
the highest efficiency possible in log
breakdown.