Dremel 4300 Operating/Safety Instructions Manual page 11

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DREMEL CHUCK
Dremel Chuck allows you to quickly and
easily change accessories on Dremel Rotary
Tools without changing collets. Accepts
accessories with 1/32" - 1/8" shank. To
loosen, first press shaft lock button and
rotate the shaft by hand until the lock
Do not engage lock
engages the shaft preventing further rotation.
while the Rotary Tool is
running.
With the shaft lock engaged use the wrench
or the EZ Twist Nose Cap to loosen the
chuck and open the jaws. Remove the
accessory from the chuck. If necessary,
continue loosening the chuck so that the new
accessory fits between the jaws. Insert the
new accessory into the chuck far enough so
that there is approximately 1/4" between the
end of the chuck and the beginning of the
working part of the accessory (drill bit flutes,
sand paper, engraving end, etc.). With the
shaft lock engaged, tighten the chuck using
the EZ Twist Nose Cap or wrench to secure
the accessory.
Helpful Tips when using the
Dremel Chuck
• The Dremel Chuck and the collet and collet
nut system are interchangeable on this tool.
While the chuck will provide you with the best
experience for changing accessories, the
collet and collet nut will provide a more
precise accessory holding solution especially
in heavier side load applications. If you will be
using your rotary tool for routing, heavy wood
or metal cutting, heavy sanding, or carving
you will probably have a better experience
using the collet and collet nut.
• The Dremel Chuck needs to be securely
tightened in order to retain the accessory
during use. If you find the accessory slipping
in the chuck, use the included EZTwist Nose
Cap or wrench to tighten the chuck around
the bit. If further slippage persists, switch to
using the collet and collet nut.
• The jaws of the chuck can become displaced
if dropped, pried against, or filled with dust
causing the accessory to no longer run true
and concentric. This is often called run-out.
To reset the jaws, apply the following
procedure:
1. Remove the accessory from the chuck.
2. Clean the chuck if necessary using
compressed air.
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FIG. 3
SHAFT LOCK
BUTTON
Always wear
goggles when cleaning
tools with compressed air.
3. Press shaft lock button and tighten the chuck
until the jaws extend past the outer surface of
the chuck, approximately 1/8".
4. Push the end of the chuck firmly against a
hard flat surface to be sure the jaws are all
seated axially.
5. Continue to hand tighten the chuck until the
jaws completely close.
6. Loosen the chuck, and reinsert a straight
accessory.
7. Turn the tool by hand and observe if there is
any run-out. If there is obvious run-out,
repeat the procedure.
8. With the shaft lock engaged, tighten the
chuck using the EZ Twist Nose Cap or
wrench to secure the accessory.
9. Turn the tool on to the lowest speed setting
and observe for run-out. If there is obvious
run-out, check that the accessory is straight
before repeating the procedure.
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DREMEL
CHUCK
safety
11
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