Yeah I'll jump in here.

I was taught to use all three holes on a jacobs chuck...
I agree with the 'coller gets torqued differently' theory...


As for the 3 Jaw lathe chuck, I was taught that since the actuation
mechinisim is totaly differet than on a jacobs chuck that it was
unnecessary, since the scroll is doing the work not pushers behing the
coller...

and yeah, if I'm really worried on the lathe.. I use all three....

I say.... Dad was right.....

--.- Dave


"darkon" wrote in message
...
Here's a question from another newsgroup. Opinions?

[John is in Britain, hence the "Pondian" reference.]


From: John Hatpin
Newsgroups: alt.fan.cecil-adams
Subject: Hey, chuck!
Date: Tue, 28 Feb 2006 23:00:34 +0000
Message-ID:

Frame of reference: you've got an electric drill, or maybe a
hand-drill, and the bit fits into a traditional chuck, tightened
with a key that slots into one of three holes on the chuck and
meshes with a circular, toothed edge at a 90-degree angle. You
know the deal, I'd guess, unless there are major Pondian
differences I'm unaware of.

My father, God bless him, who knows more about tools than I'll
ever comprehend, tightens the chuck by putting the key into each
of the three holes in turn and giving it a final twist from each.
I only tend to do it once in one hole, on the basis that all
you're doing is turning the collar of the chuck, and there's no
difference between doing that with the end of the key in hole 1, 2
or 3.

Assuming I've framed the question adequately, what's your opinion?
Is my lovely old Dad right?