"Bill Rubenstein" wrote: (clip) There are businesses here in Missouri
which crank out really poorly made walnut bowls by the thousands.
^^^^^^^^^^^^^^^^
Besides, I don't believe those machines are really copying. They are
performing a set of programmed steps to produce a bowl. The characteristics
of the bowl are probably chosen to make the operation feasible. Hand that
machine a different shape to "copy" and it will be helpless.

Even spindle copiers are regarded as poor performers. Many turners have
reported that they can more successfully produce duplicates by programming
their brains than by struggling with the shortcomings of a copy attachment.