chatter mark

• Marque ondulée ou inégale laissée sur une surface, notamment sur le métal ou le bois, provoquée par des vibrations ou un usinage irrégulier lors du travail des matériaux ou de l'utilisation d'outils.

A wavy or irregular mark left on a surface, especially on metal or wood, caused by vibration or uneven cutting during machining or tooling processes.

1. Geological featureC2formal

   A small, irregular groove or scratch on a rock surface caused by the movement of a glacier or by the vibration of a tool.

   strie glaciaire (petite)

   • The geologist identified chatter marks on the bedrock left by the retreating glacier.
   • Chatter marks can indicate the direction of glacial movement.
   • The surface of the stone was covered in fine chatter marks from the cutting tool.

2. Machining defectC2formal

   A wavy or uneven mark left on a machined surface due to vibration or chatter of the cutting tool.

   marque de broutage

   • The lathe operator noticed chatter marks on the finished metal part.
   • Chatter marks can be reduced by adjusting the speed of the machine.
   • The surface finish was ruined by deep chatter marks.