On Aug 24, 9:01 am, Nick Mueller wrote:
Tom Roberts wrote:
I see no _theoretical_ problem in constructing a
machine tool that has work extending outside itself by distances larger
than the size of the tool itself.
...
Nick

A machine can build a structure larger than itself if it has closed-
loop positional feedback that allows it to correct errors. If I
understand what DG is looking for, this means the self-replicating
machine tool would have to make laser rangefinders as well as
duplicate all its own mechanical parts. The basic self-replicating
unit may be a diversified company that owns both a steel mill and an
IC fab.

jw