Babbitting is the process of bonding a molten, soft alloy metal (Babbitt metal) to a stronger metal. In the case of Babbitted chipper knives, Babbitt metal is added to the back end of a knife so that when it is installed it has the proper extension from the wear plate of the chipper disc giving you the desired chip size. Normally, a worn chipper knife is removed, re-ground and then Babbitted to restore the correct knife length.

Babbitt metal used for chipper knives is an alloy of tin, copper, antimony, and lead.