A few good machined metal parts images I discovered:
Le Helicron
Image by Tinkerbots
dan jones
www.steampunktendencies.com/post/93731715719/le-helicron-…
CAPTAIN zANN ~ Assemblage Robot Sculpture
Image by Tinkerbots
CAPTAIN zANN… Portion machine, element…? 22" tall.
Discovered Object, Assemblage Sculpture by Dan Jones of Tinkerbots