On 2009-01-09, _ wrote:
On Thu, 08 Jan 2009 23:42:02 -0600, Ignoramus7855 wrote:

Steve, your test bar should be picked up tomorrow. Thank you.

I spent a long time with my lathe. Here's what I found.

1. The lathe spindle itself does not seem to be bent (when turned and
watched with a dial indicator).

[ ... ]

3. There is a considerable amount of crud in the inside of the three
jaw chuck, where it mates to the spindle. Such as, bits of swarf
imbedded in the soft inside of the chuck. As well as irregular
structure from impact of said swarf. Obviously, someone tried to mount
a very dirty chuck once, to its detriment. I took a drill bit and
carefully lifted that crud off using that drill bit as a scraper. I
also very thouroughly cleaned the Lo spindle surface, which now looks
great and checks out well dith dial indicator (0.001" or so)

4. I then noted that I have a four jaw chuck, which I was reluctant to
use before.

Iggy, set your lathe to the tpi of the spindle, mount the four-jaw, hold
the three jaw in it with the threads outwards (or hold the mounted four-jaw
with the three-jaw, same orientation). Indicate to make sure the body is
square and centred, then clean up the three-jaw threads with a threading
tool in the tool-post. I would probably turn the chuck by hand while doing
this, so as not to change the depth of the threads and to stop before I hit
the bottom.

Only one problem with this. It would work with a threaded
spindle, but his spindle nose is *not* threaded, only tapered with a
key. (It should be called "L-0" not "Lo"). It is one step larger than
my L-00.

There are threads -- but they are on the OD of the socket on the
back of the chuck, and a threaded collar screws onto this to draw up the
chuck good and tight to the taper.

I guess that he might be able to turn the ID of the tapered
socket clean, but it is tricky to set it up accurately enough, and I'm
not sure that his compound has enough travel to do it all in one setup.
(The nose taper is too steep for the usual taper attachment.)

Enjoy,
DoN.

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