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To makedeepercutsit isthereforenecessaryto
makeasmanysuccessivepassesasrequired,
loweringthebit1/8inchforeachnewpass.Inorderto
savetime,doallthecuttingnecessaryatonedepth
setting,beforeloweringthebitforthenextpass.This
willalsoassureauniformdepthwhenthefinalpassis
completed.See Figure 12.
1ST.
2ND.
PASS
PASS
2ND.PASS
Fig. 12
DIRECTION OF FEED AND THRUST
The router motor an_ bit revolve in a clockwise direc-
tion. This gives the tool a slight tendency to twist (in
your hands) in a counterclockwise direction, especially
when the motor revs up (as at starting).
Because of the extremely high speed of bit rotation
during a "proper feeding" operation, there is very little
kickback to contend with under normal conditions.
However, should the bit strike a knot, hard grain,
foreign object, etc. that would affect the normal
progress of the cutting action, there will be a slight
kickback -- sufficient to spoil the trueness of your cut if
you are not prepared. Such a kickback is always in the
direction opposite to the direction of bit rotation.
To guard against such a kickback, plan your setup and
direction of feed so that you will always be thrusting
the tool -- to hold it against whatever you are using to
guide the cut -- in the same direction that the leading
edge of the bit is moving. In short, the thrust should be
in a direction that keeps the sharp edges of the bit
continuously biting straight into new (uncut) wood.
ROUTING
Whenever you are routing a groove, your travel
should be in a direction that places whatever guide
you are using at the right-hand side. In short, when
the guide is positioned as shown in the first part of
Figure 13, tool travel should be left to right and
counterclockwise around curves. When the guide is
positioned as shown in the second part of Figure 13,
tool travel should be right to left and clockwise around
curves. If there is a choice, the first setup is generally
the easiest to use. In either case, the sideways thrust
you use is ag.ainst the guide.
GUIDEOUTSIDE
ROTATION
ROTATION__..___,
/
GUIDE
\
t
I
I
I
t
FEED
GUIDEINSIDE
ROTATION_1_
FEED
THRUST
Fig. 13
12