resulting in savings for the company. For
Moving blade gang ripsaws come
example, fixed gang saw can require up
to 20 minutes changeover time, which,
if this happens 5-6 times a day, is about
two hours of run time per day.
in many different configurations and
sizes. Typical configurations are 12-,
18- or 24-inch wide saws with 1 to 6
moving blades. You should look at how
many rips typically will come out of the
saw to determine how many moving
blades are required. The smaller the
part sizes, typically the more moving
blades you will require to cut the most
optimal solution out of each board.
Check with the machinery manufac-
turer to determine the smallest net
rip the saw is capable of producing.
Some combination of moving and
fixed blades should also be considered
depending on your cut bill.
A moving blade ripsaw can increase
your yield from a fixed gang saw from
1-5 percent or more depending on your
part sizes. If your product allows the
addition of random width parts to your
cut bill, substantial increases in yield
will be seen over a fixed arbor saw. You
may also be able to buy a lower grade
material, saving money while still improving your yield by using the moving
blade ripsaw to cut around the defects.
Simulations can be done with your cut
bill to determine what the best ripsaw is
and what yield increase you can expect.
Material handling & optimization
I am still amazed at the number of
operations that manually feed their
ripsaws. Some have lasers for referencing the positions of the saw blades
or marks on the machine to give the
operator a visualization of where to
feed the board. This method is slow
and takes an experienced operator to
get the best yield from each board.
An optimizing infeed for the gang
ripsaw can help increase production
through the saw and also increase the
yield. Optimizing infeeds use either a
photo eye array or cameras to measure
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