Data's painting of a blacksmith
A blacksmith was an artisan who heated metal to form various objects with the use of a hammer and an anvil.
When Data experienced his dreams in 2369 he saw his creator, Noonien Soong as a blacksmith, who created a raven wing. After this dream, Data drew a painting of this occurrence. (TNG: "Birthright, Part I")
In 2370, Data encountered Skoran, a blacksmith on Barkon IV, when he lost his memory and sold radioactive pieces of metal to him contaminating the town. Data was able to heal everyone from the radioactive poison before being stabbed by Skoran. (TNG: "Thine Own Self")
The Arm of Hephaestus was a tool created by Leonardo da Vinci in a holoprogram in 2373. Upon its completion, da Vinci proclaimed that "every blacksmith who has ever swung a hammer will thank me for this creation." (VOY: "Scorpion")