DeWalt DW621 Instruction Manual page 24

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Insert the round shank of the desired router bit into the
loosened collet as far as it will go and then pull it out about
1/16". Ho)ld the spindle shaft by depressing the spindle lock
button 1 , while firmly tightening the collet nut with the
wrench provided to prevent the bit from slipping.
Your router has a unique locking system for retaining the
bit. When removing a bit, the collet nut must be loosened
with the wrench. The collet nut will turn approximately 3/4
of a turn and then become tight again. At this point the bit
can't be removed. Using the same procedure, loosen the
nut a second time. This lifts the collet and makes it easy to
remove the bit.
NoTE: Your router is equipped with a clear plastic cap over
the cutting area. This cap assists with dust extraction. When
installing a router bit over 1–1/8" in diameter, ensure the
plastic cap 3 is removed or positioned above the cutting
portion of the bit. To remove the cap, push it from the
bottom of the router. To re-install the cap, align the tabs
and snap it into place.
Fig. C
Fig. D
Collets

WARNING: Projectile hazard. Only use bits with
shanks that match the installed collet. Smaller
shank bits will not be secure and could become loose
during operation.

CAUTION: Never tighten the collet without first
installing a router bit in it. Tightening an empty collet,
even by hand, can damage the collet.
22
This tool comes with both 1/4" (6.35 mm) and 1/2" (12.7
mm) collets. To change collet sizes, unscrew the collet
assembly, as described above. The collet and the collet nut
are connected. Do not attempt to remove the collet from
the collet nut.
Controls
Electronic Speed Control Dial
The speed of your router is variable. Use the electronic
speed control
wood, plastics and aluminum. Use the lower settings (1–3)
for large diameter cutters and the higher settings for small
diameter cutters. See Table A for more information.
Your router is equipped with constant speed cutting—as
you load the router, the selected cutting speed does not
slow down during normal use. The electronic control
governs the motor and gives you a consistent finish to your
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work. Only under very heavy loading will the speed of the
unit fall below the governed speed.
To set the router speed (from 8,000 rpm to 24,000 rpm)
rotate the speed control wheel shown in Fig. C. The higher
the number the higher the speed. Consult the table below
to help select the proper speed for your application.
The speeds in this chart are approximate and are for
reference only. Your router may not exactly produce the
3
speed listed for the dial setting.
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TaBlE a: spEED sElECTIoN ChaRT
DIAL SETTING
1
2
3
4
5
6

WARNING: Always follow the bit manufacturer's
speed recommendations as some bit designs require
11
specific speeds for safety or performance.
If you are unsure of the proper speed or are experiencing
any type of problem, contact the bit manufacturer.

WARNING: Do not operate tools rated "AC
only" on a DC supply. Loss of speed control may
result, causing tool damage and possible hazard to
the operator.

WARNING: If the speed control ceases to operate, or
is intermittent, stop using the tool immediately. Take
it to a D
for repair.
NOTICE: The router is equipped with electronics to monitor
and maintain the speed of the tool while cutting. In low and
medium speed operation, the speed control prevents the
motor speed from decreasing. If you expect to hear a speed
change and continue to load the motor, you could damage
the motor by overheating. Reduce the depth of cut and/or
slow the feed rate to prevent tool damage.
4 dial to produce uniform cutting results in
APPROX. RPM
8,000
12,000
14,000
18,000
21,000
24,000
WALT factory or authorized service facility
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