Which of the following files is used to remove maximum material faster?

Concept:

• File grades are determined by the spacing of the teeth.
• There are the following types of files used:
  • Bastard File: Used in cases where a heavy reduction of material is required.
  • Second cut File: Used to give a good finish on metals. It is excellent to file hard metals.
  • Smooth File: Used to remove small quantities of material and give a good finish.
  • Rasp File: It has individual, sharp, pointed teeth in a line. It is used to produce a rough cut that is used primarily on wood, rubber, plastic, and soft materials like aluminium, lead, horn and hoof of animals.
  • Flat File: It has a rectangular cross-section. It is slightly tapered, both in width and thickness. The edges along the width are parallel up to two-thirds of the length and they are tapered towards the point.
  • Hand File: It is similar to the flat file, except that it has a constant width throughout its length and taper off only in thickness. Both the faces are double cut, one edge single cut, and another edge as a double cut. Because of the safe edge, they are useful for filing surfaces which are at right angles to surfaces already finished. A hand file is also known as a safe edge file.