Użytkownik "Tomasz Finke" <t...@i...pwr.wroc.pl> napisał
> To dość prymitywne namiastki, ja się zastanawiam, jak 200 lat
> temu
> można było zrobić TAKIE coś bez tokarki: ;)
> http://www.wilanow-palac.art.pl/index.php?id=877

Ha czyzby jednak na tokarce ?

http://www.puzzlemuseum.com/puzzles/ivory/puzzleball
.htm

HOW ARE PUZZLE BALLS MADE?
The sphere is turned on a lathe then conical holes are drilled
towards the center. The maker has a set of "L" shaped tools: the
one with the longest upright has the shortest cutter, and the one
with the shortest upright has the longest cutter.

Starting with the longest tool he lowers it to the narrow bottom of
each hole in turn and rotates it to cut the innermost ball free.
Then he gets the second tool which does not reach so far down the
hole but can cut a wider arc and separates the second ball. He
continues working from the innermost to outermost shell. For
obvious reasons, usually only the outermost balls are elaborately
carved.



J.