Spent the day leveling a Daewoo Puma today. We have an import quality
"master precision" level. Apparently graduated to .0002" over
10" (sounds like bullshit to me, but that's what the tool says).
The long and the short of the situation is that the X axis is no
problem. Can get it entirely within 1/4 graduation of level.
The Z is not so easy. The best we can do is the bed low in the middle
(zero), with the headstock being 2 graduations high, and the tailstock
being 2 graduations high as well.
The Puma has basically four pads under the headstock, and two under
the tailstock. There are no pads in the exact middle so we can't
simply jack the middle up to get rid of the "smiley face". Of the four
pads under the headstock, two are about 12" closer to the middle than
the other two, but they're certainly under the headstock.
Despite our best efforts and at least three distinct approaches to
this situation, we were unable to get the Z axis any closer than high
2 at each end.
So - should we stop there and start making chips, or is our (half-way
expensive) time worth the effort of fighting with the last +2
graduations? If the lathe is actually .0004" out over 14" travel, I'm
inclined to leave it as the longest part is only about 5" long and we
have no tolerances below about +/-.002" for this machine.
Naturally my boss is not only interested in tolerances, but also
premature machine wear.
Thoughts would be appreciated!
13 years ago