In 1880, Swasey and Warner resigned from Pratt & Whitney in order to start a machine-tool-building business together. They investigated Chicago as a place to build their works, but they perceived the Chicago of 1880 as too far west and lacking a sufficient labor pool of skilled machinists. So they went to Cleveland, Ohio, where their company would stay for the next century. They worked together for 20 years without a formal corporate agreement, during which time their partnership's principal products were various models of lathes and milling machines. From the beginning, the partners built both machine tools and telescopes, which reflected their interests in toolmaking, instrument-making, and astronomy.