I got a used 6 1/4" three jaw chuck a couple of years ago. It has always
required a lot of effort to open or close. I took it apart and cleaned and
lubricated it when I first got it and everything appeared normal. I've got it
apart again now and the all the jaws are tight in all the slots of the body;
to the point I can't move them with my hand but have to rap them with a
soft-faced hammer.

Question: If I lap the jaws to the body am I going to regret it later?

Thanks.

Roger in Vegas
Worlds Greatest Impulse Buyer.

Roger Hull wrote:
I got a used 6 1/4" three jaw chuck a couple of years ago. It has always
required a lot of effort to open or close. I took it apart and cleaned and
lubricated it when I first got it and everything appeared normal. I've got it
apart again now and the all the jaws are tight in all the slots of the body;
to the point I can't move them with my hand but have to rap them with a
soft-faced hammer.

Question: If I lap the jaws to the body am I going to regret it later?

I had an old chuck that behaved the same way.
A close inspection showed some dings in the
jaw ways. Stoning down the dings without taking
away any other metal fixed it.

I had an old chuck that behaved the same way.
A close inspection showed some dings in the
jaw ways. Stoning down the dings without taking
away any other metal fixed it.


This fix is usually necessary for off-shore chucks, too, even if new.

The jaws should slide through easily, without excessive force and without play.

Also, the jaws should fit the scroll without binding.

A little stoning here and there will make a difference.

Check the jaws and the face of the chuck for where the problem is happening.
Odds are that the jaws have a rough finish inside the grooves for the face
or the face has a rough cut on the slot. Look for bright spots that have
formed from the upsetting of the metal and file them (not the whole area but
just the little bit of bright spot) down a little and try again. Make sure
that you get the jaws go into the correct slots each time or you may end up
with problems.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!

"Roger Hull" wrote in message
s.net...
I got a used 6 1/4" three jaw chuck a couple of years ago. It has always
required a lot of effort to open or close. I took it apart and cleaned and
lubricated it when I first got it and everything appeared normal. I've got
it
apart again now and the all the jaws are tight in all the slots of the
body;
to the point I can't move them with my hand but have to rap them with a
soft-faced hammer.

Question: If I lap the jaws to the body am I going to regret it later?

Thanks.

Roger in Vegas
Worlds Greatest Impulse Buyer.


No, you won't regret it. I have had to do it a few times with new chucks.
Only don't use a coarse grit. You only have to take out a small amount of
material and open and close the jaws 2 or 3 times. Then clean it really good
and see how it feels. Sometimes you have to do it twice. It has been a while
since I have done one. I think I used 800 grit.

Richard W.

In article ,
Peter H. wrote:


I had an old chuck that behaved the same way.
A close inspection showed some dings in the
jaw ways. Stoning down the dings without taking
away any other metal fixed it.


This fix is usually necessary for off-shore chucks, too, even if new.

It depends on *where* off-shore. I've had very good results
with my Bison (which is from Poland).

The jaws should slide through easily, without excessive force and without play.

Agreed.

Also, the jaws should fit the scroll without binding.

Also agreed.

A little stoning here and there will make a difference.

Ideally, it should not be necessary, but if it is, it will help.

Good Luck,
DoN.
--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

Roger Hull wrote:

I got a used 6 1/4" three jaw chuck a couple of years ago. It has always
required a lot of effort to open or close. I took it apart and cleaned and
lubricated it when I first got it and everything appeared normal. I've got it
apart again now and the all the jaws are tight in all the slots of the body;
to the point I can't move them with my hand but have to rap them with a
soft-faced hammer.

Question: If I lap the jaws to the body am I going to regret it later?

Thanks.

Roger in Vegas
Worlds Greatest Impulse Buyer.

Paint it up with a magic marker and run things through. You'll see what and where
quickly.

mj