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==Chuck types==
Keyless: Quick & easy to use. Some keyless chucks give poor grip
compared to keyed, often coming loose, especially with hammer action,
and some are very good. Clickstop chucks perform even better than
keyed chucks.
* 2 part sleeve: requires 2 hands to operate
* single sleeve: requires one hand to operate. To get maximum
tightening, set the drill to its lowest gear.

Keyed chuck:
* Less convenient to use than keyless.
* Level of grip with these is consistently good, but there are
situations in which they can come loose, mainly with hammer action and
large bits.
* Loss of the key wastes time if not attached to the mains lead.

SDS, SDS+: 2 slightly different names for the exact same thing. Big
performance advantages over the older types of chuck in hammer mode.

SDS max: larger heavier duty version of SDS+


==Non-SDS chucks==

===Keys===
There are different key sizes. If you get a multi-headed replacement
key, it saves time to put some paint on the bit that fits.

The key can be attached to the mains lead with a cable tie to avoid
wasted time searching for it.


===Replacement===
Replacing a chuck is a fairly easy job, and doesn't cost much.
* Ensure the replacement is the right size of thread, and takes a
suitable maximum size of tools.
* Some chucks are unsuitable for hammer use, and non-SDS hammerable
chucks are unsuitable for SDS use in hammer mode (SDS applies much
greater forces).


===Removal===
# Open the chuck jaws wide.
# Unscrew the [[screw]] down the centre between the jaws. These often
have a reverse thread and can be very tight. A manual [[impact
driver]] can be useful.
# Insert chuck key, or attach [[Clamps|locking pliers]] to the top of
a keyless chuck
# Tap the key with a [[hammer]] to unscrew the chuck from the drill


===Repair===
Whether the chuck is sticking, loosening unwantedly or the jaws are
out of position, the repair procedure is much the same. Remove the
chuck from the drill, remove its outer cover, and clean the parts up.

Application of [[oil]] where not appropriate can result in chucks
coming undone when they shouldn't.

In some cases its possible to reassemble a broken key ring and have
the chuck then work fine long term. I did this once, and have had no
problem with it. The broken parts are kept in place by the outer
cover, and it works perfectly.


==Disassembly==
# Remove chuck from the drill,
# Clamp the outer body of the chuck near the drill-ward end (don't
[[clamp]] near the key tightening ring), ideally in a vice in 2
indented bits of [[wood]].
# Tap the stem towards where the drill bit tip would be, to push the
chuck assembly out from the outer cover

The mechanism is simple, and self assembly is fairly self evident.


==SDS Chucks==
Need greasing very occasionally.


==See also==



[[Category:Tools]]




NT