Craftsman 320.27680 Operator's Manual page 21

The depth indicator ring (D), located on the fine adjustment dial is marked in 1/64th
inch increments. Turning the fine adjustment dial clockwise 180 ° (1/2 turn), lowers
the cutter bit 1/16 inch. One full turn clockwise 360 ° lowers the bit 1/8 inch.
The system allows a maximum of 7 full 360 ° revolutions clockwise, to lower the
cutter bit a total of 7/8 inch.
The depth indicator ring may be reset to zero "0" without moving the fine
adjustment dial. This allows the user to begin adjustments from any reference
point desired.
To Adjust Depth (Figs. 6 and 7)
1. Turn the motor off and unplug the router from the power source.
2. Place the router on a flat, level surface with the back of the fixed base facing
you. Open the motor clamp (E).
3. With the cutter bit already installed, press in the coarse adjustment knob (B),
and lower the motor into the base until the cutter bit very close to the flat
surface on which the base is sitting. Turn the fine adjustment dial (C) until the
cutter bit just touches the flat surface on which the base is sitting. Then lock
the motor clamp (E).
4. While continuing to press the coarse adjustment knob (B), turn the fine
adjustment dial (C) until the zero "0" mark on the depth indicator ring (D) is
aligned with the 'T' mark on the base.
5. Release the coarse adjustment knob, making sure that the "0" remains
aligned with the mark.
6. Place the router on two level scrap workpieces, and position it so that the
cutter bit can be lowered below the sub-base (Fig. 7).
7. Turn the fine adjustment dial (C) clockwise to lower the bit to the desired
depth of cut. Turn the dial counterclockwise to raise the cutter bit.
8. Once your depth of cut is set, close the motor clamp (E) securely.
NOTICE: Making a single deep cut is never advisable. Smaller diameter cutter
bits are easily broken by too much side thrust and torque. Larger cutter bits will
cause a rough cut and be difficult to guide and control. For these reasons, do
not exceed 1/8 in. depth of cut in a single pass.
DEPTH ADJUSTMENT WiTH THE PLUNGE BASE
a WARNING: Your router should never be turned on or be connected to the
power source when you are assembling parts, making adjustments, installing
or removing collets/nuts or cutter bits, cleaning, or when it is not in use.
Disconnecting the router will prevent accidental that which could cause serious
personal injury.
Plunge Action (Fig. 8}
The plunge base simplifies depth adjustment and allows the cutter bit to be
accurately lowered into the workpiece for more precise set-ups.
To lower the cutter bit, release the plunge-lock lever by moving it "up" to the
unlocked position.
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