Grotnes Inc. is a leading manufacturer of custom metal forming equipment that serves the aerospace, transportation, energy, and forging industries. Founded in Chicago in 1898, the company has been a pioneer in engineering for over 125 years. Its core technologies include expanding, shrinking, rotary roll-forming, spinning, and emission canning. The company caters to a global customer base and has a service organization that can provide full retrofits and rebuilds. Our Niles, Michigan location boasts a fully-equipped machine shop, as well as our ‘Metal Labs’ division that specializes in prototyping and batch production of parts.