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TYPICAL
OPERATIONS
HELPFUL HINTS - MAKING
CUTTER SIZE
SELECTIONS
AS you can see listed in the accessories,
a wide
variety of cutters is available.
Therefore, there is a
variety of sizes, grooves, curves and angles involved.
This
often
creates
the
need
to
estimate
the
AVERAGE CUTTING DIAMETER when making cutter
size selections on the front panel. The following
ex-
amples Illustrate
how to estimate, the average cut-
ting diameter.
REMEMBER:
We recommend
that
cuts be made at a depth not exceeding 1/8" and that
several
passes
be made
to reach depths
of cut
greater than 1/8"
See Figure 13. In this illustration
a V-groove cutter is
being used to make a 5/16"
deep cut. To find the
average
cutting
diameter,
add
the
maximum
diameter
(5/8") to the minimum
diameter
(0), then
multiply
by 1/2. The average diameter
of the cut
equals 5/16".
Since
5116" lies between
the "1/4
inch" and "3/8
inch" position on the front
panel,
either could be used. Difficulty
in controlling,
dif-
ficulty
in cutting, material hardness, etc. are factors
which can be used In determining which position to
select. For example, if the material was difficult to
cut, then the "3/8
inch" position would probably be
best since the cutting
speed will be slower.
See Figure 14. In this illustration the V-groove cutter
is being used to make a cut with a 3/4"
maximum
diameter.
The
m_ximum
diameter
is
3/4",
the
minimum
diameter
is still
0",
and the
average
diameter
Is now 3/8".
In this case, the "3/8 Inch"
position would
be the best
cutter size selection.
NOTE: Your depth of cut would also be 3/8".
See Figure 15. This illustration shows a cove cutter
with a non-zero minimum
diameter.
The average
diameter
Is still computed by adding the maximum
diameter to the minimum diameter, then multiplying
by 1/2.
For example,
If the
maximum
diameter
equals 112" and the minimum diameter
equals 3/8",
then the average diameter equals 7/16"
(1/2 is the
same as 4/8, therefore, 4/8"
+ 3/8
= 7/8",
7/8" x
1/2
--. 7/16").
Either the "3/8
inch"
or "1/2
Inch"
position could be selected on the front panel.
As mentioned
earlier, it is best to make a trial cut on
a scrap piece of wood where possible. The average
diameter
of the cutter can also be determined
by
measuring
the maximum
and minimum
diameter
from the widths of a trial cut. If necessary,
then a
change or correction in the cutter size can be made
before making the finished cut.
HELPFUL HINTS _ USING CARBIDE TIPPED
CUTTERS
Since carbide cutters cut at higher speeds than steel
cutters,
it often becomes
necessary
for the front
panel settings
to be different
while using carbide
cutters. As mentioned earlier, the "very hard"
posi-
tion under the material indicator setting was design-
ed for using carbide cutters when cutting materials
that are too hard for steel cutters. However, carbide
cutters
can
also be used
for
cutting
the
same
materials that steel cutters cut.
5/16" DEPTH OF CUT
AND AVERAGE DIA.
_-5/8 MAXIMUM DIA.
Fig. 13
\3iff'AVEllAGE
DL4,
""---3/4" _.XIMuM
DIA.
Fig. 14
•
ij
Jl
_._
--3/8"MINIMUM
DUL
1/2" MAXIMUM
DUL
Fig. 15
When
using carbide
cutters
to but these
softer
materials, a good rule to remember
Is to set either
the "material"
or "cutter
size" iridicator one position
above that recommended
for steel cutters. For exam-
ple, a 1/2" carbide cutter should have the "3/8 inch"
selection on the front panel. If a 1/4" carbide cutter
is being used then the material indicator should be
moved up one position. For example, from "hard"
to
"medium",
or "'medium"
to "soft".
The fastest speed at which your electronic
router
will run is with the "soft"
and "1/4 Inch" selections
on the front panel. This will be the fastest speed for
both carbide cutters and steel cutters (25,000 RPM,
no-load speed).
Page 11
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