On Sun, 31 Jul 2011 23:25:48 -0500, Ignoramus5931
wrote:

Among various stuff that followed me, there was this six jaw chuck:

http://yabe.algebra.com/~ichudov/mis...Chuck-8676.jpg

this is a plain back chuck, and I wonder if it makes sense to keep it
and adapt to my Clausing lathe. I can buy plain back mounting adaptors
for my lathe easily. I did it once when I had to machine it to fit the
four jaw chuck. This machining actualy improves lathe accuracy.

The question is, do I really need the six jaw chuck.

When was the last time that you had to use it, and for what reason?

i

I use a pair of Buck 5" 6 jaw chucks regularly on my Hardinge HLV-H.

When one cuts thin Stuff...the ability to clamp it and not dent the work
piece is far far better with a 6 jaw.

Put a thin bit of tubing in your 3 jaw chuck, then turn it, in the ID.

Then take it out and run an ID mike in the bore. You will indeed find 3
much thinner places where the jaws pushed in the material. So your hole
is no longer round..but trilobed internally. Or Externally if you use an
internal 3 jaw.

The 6 jaw really..really..really helps when you have to do thin wall
work.

Or work with odd, not round ID or OD profiles. You can actually machine
a D shaped bit of metal on your lathe..something you cannot do with a
standard 3 jaw.

Its not a Miracle tool..but at times it comes damned close.

For the average guy who isnt working to close dimensions or doing
delicate work..shrug..but for a serious machinist..its very very handy
to have a 6 jaw in ones tools.

Gunner

--
"The danger to America is not Barack Obama but a citizenry
capable of entrusting a man like him with the Presidency.
It will be far easier to limit and undo the follies of an
Obama presidency than to restore the necessary common sense
and good judgment to a depraved electorate willing to have
such a man for their? president.. Blaming the prince of the
fools should not blind anyone to the vast confederacy of
fools that made him their prince".