THE GUIDE TO FILES AND FILING

ing that produces the perfectly true flat or curved surface nec-essary for the uniform formation of the teeth. 5. Forming teeth:The teeth are formed by a rapidly reciprocat-ing chisel that strikes succes-sive blows on the file.The hard-ened chisel cuts into the soft blank displacing and raising the steel into the desired tooth structure. 6.

  Reciprocat, Reciprocat ing