Feinmechanisches Museum Fellenbergmühle, Museum of precision mechanics in Merzig, Germany

The Feinmechanisches Museum Fellenbergmühle is a museum of precision tools and machines in Merzig housed in a historic building. The collection spans three floors and includes working equipment for watchmakers and goldsmiths from the early 20th century.

The mill on the Seffersbach was built in 1767 by Romanus Siegele and Mathias Gusenburger; the fast brook once drove up to 32 mills. In 1927 Johann Peter Hartfuß set up a precision mechanics workshop in the former grain and oil mill, making machines and tools for watchmakers. A Francis turbine installed in 1929 raised efficiency and also drove a direct-current generator. The 1931 patented Cardan wedding-ring engraving machine, still demonstrated today, engraved initials using stencils.

The museum displays craftsmanship techniques through working machines that artisans such as watchmakers and goldsmiths used in their daily work. Visitors can see how precision work looked in the past and what tools were necessary for it.

Former workshop employees lead visitors through the building and demonstrate the working machines and how they operate. It helps to allow time to follow the explanations and view the different workshop areas.

The 1931 Cardan wedding-ring engraving machine, developed and patented by the workshop itself, still engraves initials in a few minutes using stencils. The clockwork Johann Peter Hartfuß designed in 1925 later drove the "Saarlanduhr" in Merzig's Stadtpark, whose face was made of apples, pears, tomatoes, beans, peas, carrots and grapes.