Grant Erwin wrote:

Before you scrap that 3-jaw, take it apart and clean it meticulously
and then check the scroll's bore for looseness. I recently read an article
that claimed that scrolls wear in their central bore, and that the wear is
usually uniform, and that this wear can be taken up by one shim wrapped
around the ID of the scroll's bore. Clean it, blow it out, check the scroll
play as I described, and *then* measure the eccentricity. I had a 10" 3-jaw
that went from .020" to .004" by cleaning and shimming.

GWE

shedfull wrote:

Thanks to all who replied,

That chuck was, uh m TIGHT

Its off now, got the taper cleaned up and sorted the gap piece out.
I think that chuck hadn't been off for 20 years, (could explain the
unused F/plate, catch plate and little used 4 jaw ?)
The 3 jaw sc chuck was a mile out,
I was thinking of swappng it for the 4 jaw independant I have and
investigating the 3 jaw.

Many thanks again.

Like Grant said, clean. I got my lathe from Dad and after his last move, I don't
think he was thinking. The chuck was full of metal and as he tipped it over
to thread it on, swarf fell into the threads.

When I got it - it didn't look right and didn't run right. Closer looking
the chuck didn't match the centering and back plate.

I took it off and cleaned out a lot of material and some of it compressed.
Once clean, it threaded on easily by hand, fit the centering ring and fit
flat on the backplate.

It might be as little as that or a little rust in one thread...

Martin

--
Martin Eastburn
@ home at Lion's Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

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