There is a webpage that I can't seem to locate, that shows disassembly
pictures/steps for Jacobs chucks. Many common chucks are of the same design.
The URL is something like oldiron or vintageiron, maybe. Maybe someone has
seen it recently and can post a link.

The basic procedure is to extend the jaws loosely, and use a section of
tubing around the body to press off the outer section.
A large vise or small press are suitable for the procedure.

There will most likely be a tapered-threaded ring inside that needs to be
kept righ-side-up.. wider opening up.

The jaw positions need to be maintained, so if there are no obvious markings
on them, you should mark the tops of them with 1-2-3 and remember if the
numbering is CW or CCW (anti-clockwise to some folks).

Assembly is a reverse procedure.

WB
................

"Fred R" "spam wrote in message
...
Fred swigs a 12-pack of Bass Ale onto the table

I have a couple of cheap drill chucks that feel like they've been lubed
with a mix of rubber cement and swarf. Just soaking them in solvent then
relubing might work but taking them apart would let me look for burrs.
After guessing that they are assembled with a right-hand thread between
the top part (with the taper hole) and the lower part (with the 3 holes
for the key) I tried a judicious use of force and saw no movement at all.

Before I employ a meticulously calculated lever arm (which happens to
match the length of my largest wrench) and an oh-so-gentle tap of a BFH,
could anyone tell me if this is how they are supposed to come apart? I'd
appreciate it; the chucks would appreciate it; so would my wife, kids,
and neighbors.
--
Fred R
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