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new chuck

 

Evenin' folks,
Well, at least part of the problem is the chuck jaws. I put a 1 1/2
piece of aluminum in the chuck and tightened it up real good and I can
wiggle it back and forth with my fingers. It's only gripping at the
very rear of the jaws. Same thing after I took it apart and cleaned and
greased the chuck. I'm wondering if I abused this in some way? I know
it wasn't this loose when I did the first test bar and that wasn't all
that long ago. It's not like I'm doing production on the lathe.
So, I was looking at tooling catalogs,and I'm wondering if I should
just get an independent 4 jaw to replace it with. Probably a 4 or maybe
5 inch since the 6 seems a little large for the lathe. Any thoughts
here would be greatly appreciated.
As I understand it, when you bore the jaws, the chuck is only
accurate at that diameter. But I may as well try it since it's pretty
much useless as is. I'll let everyone know how this turns out.
Dave
 

Hi Dave,

Sorry to hear that you're having problems with your chuck. You are
pretty much wasting your time with a test bar (or anything else) if
you can't hold it rigid. You may want to talk to Dennis before you
try to true up the jaws.... it's probably easier to make them worse
than better. One problem with old chucks is that the jaws get loose
in the T-slots in the body. When they get loose they can rock in the
T-slots. That makes it real hard to true them up.

I saw a pic of a plate that a guy had to hold the jaws while
grinding. It had a center hole and then three holes that went over
each jaw. When he tightened the chuck, the angled portion of the
jaws would clamp down on the corners of the three holes (where they
met the center hole) so that the gripping surface of the jaws was
clear. The idea was to "load" the jaws in the proper position.
Otherwise you would have to open the jaws against a ring... and with
the jaws loose in the T-slots, they wont come out straight.

If you are only going to have one chuck, I vote for the 4 jaw. You
should have one anyway... :-)

good luck, Jim




--- In daltonlathes@..., "Dave" <dkirk_4@...> wrote:

Evenin' folks,
Well, at least part of the problem is the chuck jaws. I put a 1
1/2
piece of aluminum in the chuck and tightened it up real good and I
can
wiggle it back and forth with my fingers. It's only gripping at the
very rear of the jaws. Same thing after I took it apart and cleaned
and
greased the chuck. I'm wondering if I abused this in some way? I
know
it wasn't this loose when I did the first test bar and that wasn't
all
that long ago. It's not like I'm doing production on the lathe.
So, I was looking at tooling catalogs,and I'm wondering if I
should
just get an independent 4 jaw to replace it with. Probably a 4 or
maybe
5 inch since the 6 seems a little large for the lathe. Any thoughts
here would be greatly appreciated.
As I understand it, when you bore the jaws, the chuck is only
accurate at that diameter. But I may as well try it since it's
pretty
much useless as is. I'll let everyone know how this turns out.
Dave
 

Hi Dave,

I also had similar problems with the well used original 3 jaw union
chuck. My machinist friend ground the jaws like Jim mentioned but
it's accuracy varied depending on the diameter of the piece. We
figured that the scroll was probably worn also. As quick and
convenient as the 3 jaw is, the 4 jaw will be more accurate. I
found a decent (4 jaw) 5 inch Skinner.

Good luck,
Brad


--- In daltonlathes@..., "Dave" <dkirk_4@> wrote:

Evenin' folks,
Well, at least part of the problem is the chuck jaws. I put a
1
1/2
piece of aluminum in the chuck and tightened it up real good and
I
can
wiggle it back and forth with my fingers. It's only gripping at
the
very rear of the jaws. Same thing after I took it apart and
cleaned
and
greased the chuck. I'm wondering if I abused this in some way? I
know
it wasn't this loose when I did the first test bar and that
wasn't
all
that long ago. It's not like I'm doing production on the lathe.
So, I was looking at tooling catalogs,and I'm wondering if I
should
just get an independent 4 jaw to replace it with. Probably a 4
or
maybe
5 inch since the 6 seems a little large for the lathe. Any
thoughts
here would be greatly appreciated.
As I understand it, when you bore the jaws, the chuck is only
accurate at that diameter. But I may as well try it since it's
pretty
much useless as is. I'll let everyone know how this turns out.
Dave
 

Jim,
Great information, and saved me a lot of typing. :o)

Besides, I'm sure you would like someone other than Dennis to agree
with you sometimes. :o)

R.T. :D
The Notorious Alabama Dalton Gangster!

--- In daltonlathes@..., "Jim Bonner" <bogyjim@...> wrote:

Hi Dave,

Sorry to hear that you're having problems with your chuck. You are
pretty much wasting your time with a test bar (or anything else) if
you can't hold it rigid. You may want to talk to Dennis before you
try to true up the jaws.... it's probably easier to make them worse
than better. One problem with old chucks is that the jaws get loose
in the T-slots in the body. When they get loose they can rock in the
T-slots. That makes it real hard to true them up.

I saw a pic of a plate that a guy had to hold the jaws while
grinding. It had a center hole and then three holes that went over
each jaw. When he tightened the chuck, the angled portion of the
jaws would clamp down on the corners of the three holes (where they
met the center hole) so that the gripping surface of the jaws was
clear. The idea was to "load" the jaws in the proper position.
Otherwise you would have to open the jaws against a ring... and with
the jaws loose in the T-slots, they wont come out straight.

If you are only going to have one chuck, I vote for the 4 jaw. You
should have one anyway... :-)

good luck, Jim




--- In daltonlathes@..., "Dave" <dkirk_4@> wrote:

Evenin' folks,
Well, at least part of the problem is the chuck jaws. I put a 1
1/2
piece of aluminum in the chuck and tightened it up real good and I
can
wiggle it back and forth with my fingers. It's only gripping at the
very rear of the jaws. Same thing after I took it apart and cleaned
and
greased the chuck. I'm wondering if I abused this in some way? I
know
it wasn't this loose when I did the first test bar and that wasn't
all
that long ago. It's not like I'm doing production on the lathe.
So, I was looking at tooling catalogs,and I'm wondering if I
should
just get an independent 4 jaw to replace it with. Probably a 4 or
maybe
5 inch since the 6 seems a little large for the lathe. Any thoughts
here would be greatly appreciated.
As I understand it, when you bore the jaws, the chuck is only
accurate at that diameter. But I may as well try it since it's
pretty
much useless as is. I'll let everyone know how this turns out.
Dave

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