P
Planing machine
歯車加工機／ハグルマカコウキ
龙门刨床
Planing machine
Machine à raboter les dentures
Glossary
Thematic
Tools, Technic
Until the end of the eighteenth century, watchmakers would plane teeth and leaves on wheels and pinions by hand, first dividing them with special files. Later, for around a century, a planing machine fitted with special files was used (although not systematically) instead. Invention of this machine is attributed to Abraham-Louis Perrelet of Le Locle (Switzerland).