Interchangeable parts
Piezas intercambiables
- Date
- 1785-1801 · confidence medium
- Place
- Springfield and Harpers Ferry (arsenals), United States; precedent in Versailles, France
- Credited to
- Honoré Blanc (France); Eli Whitney (1801 demonstration); John H. Hall and Simeon North (practical realisation)
- People
- 👤 Eli Whitney1765–1825👤 Honoré Blanc1736–1802👤 John H. Hall1781–1841👤 Simeon North1765–1852
- Field
- Tools
⚠️ Disputed: the sources disagree.
What it is
Manufacture of components to tolerances so tight that any part fits any unit, eliminating hand-fitting. The basis of the 'American system of manufactures' and of mass production.
Whitney's 1801 demonstration before Congress was partly staged with pre-fitted parts; Blanc had achieved it with muskets in France around 1785, and true interchangeability was achieved by Hall at Harpers Ferry (1820s) and North at Middletown, Connecticut.
What it led to
- Mass production of firearms, clocks and sewing machines
- The disappearance of the craft gunsmith; semi-skilled workers
- Standard gauges as industry's common language
- Ford's assembly line (1913)
Built on
- Venetian Arsenal (serial galley production)1104 (fundación); c. 1320 (producción en serie)
- Precision machine tools (Portsmouth Block Mills)1803-1808
- Portsmouth Block Mills pulley blocks (Brunel and Maudslay)
- Blanc's locksmithing at Versailles