I just purchased a 6" 4-jaw chuck on Ebay. It has a plain back, and I have
a backplate that will mount on my lathe that I'm pretty sure I can adapt to
fit the chuck. I *think* I know the right way to do this...but I just want
to make sure.

The chuck has a round recess on the back, and four mounting screws. My
guess is that I can't just use the screws to locate the chuck accurately
dead-center. It looks to me like I should face the backplate so that it has
a round step that will just fit snug inside the recess on the back of the
chuck, which will line up the center of the chuck with the lathe
spindle...., and the screws will lock it in place...

Before I create some scrap...does this sound right?

Todd

In article RWgYb.323$oj2.204@lakeread03,
Todd Rearick wrote:
I just purchased a 6" 4-jaw chuck on Ebay. It has a plain back, and I have
a backplate that will mount on my lathe that I'm pretty sure I can adapt to
fit the chuck. I *think* I know the right way to do this...but I just want
to make sure.

The chuck has a round recess on the back, and four mounting screws. My
guess is that I can't just use the screws to locate the chuck accurately
dead-center. It looks to me like I should face the backplate so that it has
a round step that will just fit snug inside the recess on the back of the
chuck, which will line up the center of the chuck with the lathe
spindle...., and the screws will lock it in place...

Before I create some scrap...does this sound right?

Yes, it does. Though it is less critical on a 4-jaw, where ou
are centering the workpiece by adjusting the jaws and measuring. You
just need the chuck to be well enough centered so you aren't way out of
balance.

For a 3-jaw universal chuck it is more important that you do
this.

Enjoy,
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 ---

If you will visit :http://easyweb.easynet.uk/~chrish/homepage.htm on general
machining. under Techniques is a totoral on mounting a chuck to a
faceplate.
hth
Paul
"Todd Rearick" wrote in message
news:RWgYb.323$oj2.204@lakeread03...
I just purchased a 6" 4-jaw chuck on Ebay. It has a plain back, and I
have
a backplate that will mount on my lathe that I'm pretty sure I can adapt
to
fit the chuck. I *think* I know the right way to do this...but I just
want
to make sure.

The chuck has a round recess on the back, and four mounting screws. My
guess is that I can't just use the screws to locate the chuck accurately
dead-center. It looks to me like I should face the backplate so that it
has
a round step that will just fit snug inside the recess on the back of the
chuck, which will line up the center of the chuck with the lathe
spindle...., and the screws will lock it in place...

Before I create some scrap...does this sound right?

Todd