Located in Niles, Michigan, Grotnes has a rich heritage acquired through partnerships, acquisitions and hard work. Originally Founded in 1898, in Chicago, Illinois, U.S.A as “Charles Grotnes Machine Works” (later known as Grotnes Metalforming Systems, or GMS), Mr. Grotnes invented a machine that could stretch and shape metal rings. The Grotnes machine, which came to be known as the expander, allowed rings to be fabricated from simple cylindrical blanks that were expanded to size while setting the desired shape. Grotnes also developed other technologies such as shrinking and rotary rollforming for the cold forming of metal.
Today, Grotnes is an innovative manufacturer of customized and integrated metal forming equipment and cells for the automotive, aerospace, agriculture, petroleum, power distribution, rigid packaging, appliance/tank and forging industries. Grotnes' proven engineered solutions, such as expanding, shrinking, rotary roll forming, spinning, and emission canning, have been used for over a century. The Formitt Metal Labs division also supports our customers with prototyping and production services capabilities.