Urrea RR912 Manual De Usuario Y Garantía página 23

To guard against and help prevent Kickback,
plan the set-up and direction of feed so that
the router is always moving, and keep the sharp
edges of the cutting bit so that they are biting
straight into new (uncut) wood (work piece).
Also, always inspect the work piece for knots,
hard grain, and foreign objects that could cause
a kickback problem.
DIRECTION OF FEED - INTERNAL CUTS
When making and internal cut, such as a groove,
dado, or slot, the edge guide, straight edge, or
board guide must always be positioned on the
right-hand side of the router as you make the
cut (Fig. 5).
Guide Outside
Bit Rotation
Bit Rotation
Router Feed Direction
When the guide is positioned on the right hand
side of the router, the router travel should
be from left to right and "counterclockwise"
around curves (see Fig. 5). This counterclockwise
action around the curve could cause "Climb
cutting." Always be alert and exercise extreme
caution to maintain control of the router when
making this type of cut around curves. When
the guide is positioned as shown in Fig. 6, the
router travel should be from left to right and
clockwise around curves.
If there is a choice, the set-up in Fig. 5 is easi-
er to use, but there is the possibility of "Climb
Cutting" around curves. In either case (Fig. 5 or
Fig. 6), the sideways thrust of the router cutting
is always against the guide, as is proper.
Guide Inside
Bit Rotation
Bit Rotation
Router Feed Direction
WARNING: always securely clamp the work
piece in place, and keep a firm grip on the rout-
er base with both hands at all times. Failure to
do so could result in loss of control causing pos-
sible serious personal injury.
FIG. 5
Thrust
Guide
FIG. 6
Guide
Thrust
E N G L I S H •
RATE OF FEED
The proper rate of feed depends on several
factors: the hardness and moisture content of
the work piece, the depth of cut, and the cut-
ting diameter of the bit. When cutting shallow
grooves in soft woods such as pine, you may use
a faster rate of feed. When making deep cuts in
hardwoods such as oak, you should use a slower
rate of feed.
FEEDING TOO RAPIDLY (FIG. 7)
Clean and smooth finished cuts can only be
achieved when the cutting bit is rotating at a
relatively high speed and taking very small bites,
producing tiny, clean-cut chips.
FIG. 7
Cut
TOO FAST
Forcing the feed of the cutting bit forward too
rapidly slows the RPM of the cutting bit, and the
bit takes larger bites as it rotates. Larger bites
mean larger chips and a rough finish. This forc-
ing action can also cause the router motor to
overheat. Under extreme force-feeding condi-
tions, the RPMs can become so slow and the
bites become so large that chips become par-
tially cut off, causing splintering and gouging of
the work piece.
The router will make clean, smooth cuts if it is
allowed to run freely without the overload of
forced feeding. You can detect forced feed-
ing by the sound of the motor. Its usual high-
pitched whine will sound lower and stronger as
it loses speed. Holding the router against the
work piece will also be more difficult to do.
FEEDING TOO SLOWLY (FIG. 8)
When you feed the cutting bit too slowly, the
rotating cutting bit does not cut into new wood
rapidly enough to take a bite. Instead, it scrapes
away sawdust-like particles. This scraping pro-
duces heat, which can glaze burn, and mar the
cut in the work piece and, in extreme cases,
overheat the cutting bit. When the cutting bit
Is scraping instead of cutting, the router is more
difficult to control as you feed it.
Us er 's M an u a l
Bit Shank
Cutter
23