DoAl.L INSTRUCTION MANUAL
2‘
COOLANT APPLICATION
When only chip removal is required and
where coolant is
not
recommended
——
in the
cutting of
cast
iron, fibers and plastics, for
example
—-
it
is
not
necessary
to
have the
coolant pump running. The
amount
of air
required
can
be controlled by the needle
valve
on
the control panel.
For mist coolant, both the air and the
coolant
are
used
at
the
same
time. The mist
is controlled by the
two
needle valves
mount-
ed
on
the control panel. When applied
to
the
point of work
it
increases the
saw
life, gives
a
finer finish and increases the speed of
cut-
ting up
to
40 per
cent.
The mist should be
directed
onto
the cutting edge of the
saw
blade. This will
assure
coolant flowing
on
both sides of the
saw.
A
fine mist is all that
is required for
most
materials.
If
flood coolant is desired,
it
is only
neces-
sary
to
turn
off the air valve and open the
coolant needle valve.
The application of coolant
to
most
‘types
of cutting increases sawing efliciency. For
conventional cutting of alloy steels and
non-
.
ferrous alloys,
a
soluble oil and
water
is highly
recommended. DoALL soluble oil is
one
of
the
most
efficient that
can‘
be used for this
purpose, and is best used when mixed
in
a
proportion of
one
part of soluble oil
to
40
parts of
water.
Use DOALL No. 470 soluble
oil in mist form for all metals. Use DOALL
No. 120
or
No. 240 cutting oils in drip form
to
saw
tough high impact metals. Use DOALL
No. 470 soluble oil in flood form for "line
grinding
or
diamond sawing. Never apply
coolant
to
the band when friction sawing.
The coolant is gathered along with the
chips by
a
pan under the table and is directed
through
a
chip box. From there
it
returns
through
a
screen
to
the coolant tank in the
base. hf the machine. The coolant drain sys-
tem
can
be used only when the table is level.
FRICTION
SAWING
In
friction sawing, momentary
contact
.
between the material being
cut
and the fast
moving
saw
blade produces enough friction
to
heat the material
to
its softening point. As
soon
as
it
becomes soft
it
is
cut
away by the
saw
teeth. This method
cuts
many times
faster than conventional methods, and
more
important,
cuts
many materials which
can
be machined in
no
other way.
Tooth sharpness is
not
an
important factor.
‘A slightly dull
saw
will usually generate more‘
friction and
cut
faster than
a
sharp
one.
A
low speed sawing operation will produce
sharply curled chips, the result of
a
hard
shearing action, whereas those produced by
friction sawing
are
shorter and
more
stubby,
with less curl and with pronounced cracks and
_
wrinkles.
For friction sawing, replace the insert
guides with roller guides and track and tension
the blade in the
same
way
as
was
done in
regular sawing. Friction
saw
bands
are
avail-
able in V2", 5%,",
or
1" widths. Shift the
machine
to
high gear and adjust band speed
to
maximum. Use heavy feed pressure.
Materials
to
be sawed should be less than
5/3" thick. Most steel alloys
are
within the
low melting point range and lend themselves
to
the friction sawing process. Annealing is
not
necessary since Rockwell hardness does
not
make
an
appreciable difference in friction
sawing. The heat penetration into the side
wall of the finished
cut
is almost negligible,
in
most
cases
being less than .002" deep.
If
the
cut
is made
too
slowly, however, greater
penetration will result.
To Next Page
Loading...
