KNOVA KN RO-1313, Manual, Page: 12 / 32

OPERATION
ROUTER FEED DIRECTION
Fig. 19
Fig. 20
GUIDE
THRUST
BIT
ROTATION
BIT
ROTATION
GUIDE OUTSIDE
GUIDE INSIDE
BIT
ROTATION
BIT
ROTATION
THRUST
ROUTER FEED DIRECTION
GUIDE
WARNING
Always securely clamp the workpiece in
place, and keep a firm grip on the router base with
both hands at all times. Failure to do so could result in
loss of control causing possible serious personal injury.
RATE OF FEED (FIG. 21-22)
The proper rate of feed depends on several factors:
the hardness and moisture content of the workpiece, the depth
of cut, and the cutting 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.
Bit shank
TOO FAST
Cutter
Cut
Fig. 21
FEEDING TOO RAPIDLY (FIG. 21)
Clean and smooth finished cuts can only be achieved when
the cutting bit is rotating at a relatively high speed, taking very
small bites, and producing tiny, clean-cut chips.
Forcing the feed of the cutting bit forward too rapidly slows
the revolution of the cutting bit, and the bit takes larger bites
as it rotates. Larger bites mean larger chips and a rough finish.
This forcing action can also cause the router motor to overheat.
Under extreme force-feeding conditions, the revolutions can
become so slow and the bites become so large that chips are
only partially cut off, causing splintering and gouging of
the workpiece.
The router will make clean, smooth cuts if it is allowed to run
freely without the overload of forced feeding. You can detect
forced feeding by the sound of the motor. Its usual high-pitched
whine will sound lower and louder as it loses speed. Holding
the router against the workpiece will also be more difficult to do.
FEEDING TOO SLOWLY (FIG. 22)
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
produces heat, which can glaze, burn, and mar the cut in
the workpiece 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.
With almost no load on the motor, the cutting bit has a tendency
to bounce off the sides of the cut in the workpiece, producing
a cut with a rippled finish instead of clean, straight sides.
Cutter
Bit shank
Cut
TOO SLOW
Fig. 22