13 years ago
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).
2. The three jaw chuck, when mounted on the Lo mount, simply does not
point straight. This is clear if I mount it carefully and turn it
while looking at a dial indicator tracking its outside circumference.
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
5. When cleaned inside, and mounted, the four jaw chuck also was
centered perfectly (unlike the three jaw).
6. I mounted a piece of round stock (not a real test bar) and was able
to center it, using a dial indicator.
While I have not tried cutting, due to everyone sleeping, I have high
hopes that a large part of my problems related to cutting tapers
instead of straight cuts, etc, is due to the bad three jaw chuck.
I will try my best to center a brand new piece of 1" 14L18 tomorrow
and to cut it lightly, with results measured carefully. I am hoping
that the result will show that the lathe is usable for my purposes,
with a four jaw chuck. That would be great. But I was wrong often
If that proves to be the case, I will look at the three jaw more
closely, to see if I can use a scraper or something to get it to
better shape and clean up those ridges inside the mating surface.