On Nov 28, 2:20*am, "Ed Huntress" wrote:
...

To get back to my original questions, that wouldn't work for the home-built
lathe I'm talking about. The complication of holding the outer spacer, and
getting the expansions right, isn't something I think you could do as a
one-shot deal. And the concrete head would add to the differential-spacing
woes.
Ed Huntress

But if you built it yourself and are the only user you know you have
to pay extra attention for problems. You could file the left-hand
bearing seat on the spindle to a moderate press fit so it can slide if
it has to, or not run it long and fast enough to warm up. You could
rub some wax on the spindle nose and shut off if it melts and turns
shiny.

Prototypes are full of gotchas and caveats but they still work well
for the people who built them. You might have to hire (or be) a tech
writer to put together a lengthy manual so someone else could safely
use the machine.

jsw