Needle files and special files

NEEDLE FILES AND SPECIAL FILES

. the different shapes of need files

. designate needle files as per BIS

. the different types of special files

. uses of esch type of special files

Needle files are usually available in sets with assorted shapes. These types of files arw used for delicate, light kinds of work. These files are available in bastardization and smooth grade.

Shapes

The common shapes of needle files. The shape are round edge, flat edge, flat taper, half round, triangular, squre, round, kinfe, feather edge, crossing, barret and marking.

Nomenclature of needle files

These files are available in a nominal length of 120mm to 180mm.

Grades

The grades of cut may be identified by the cut number as follows-

Bastard-cut 0

Smooth-cut 2

Designation of needle files

The needle files are designated by their names grade of cut

Nominal length

BIS number

Example

A flat edge needle file with grade  of cut bastard, having a nominal length L=160mm shall be designated as flat edge needle file bastard, 160 IS 3152

SPECIAL FILES

 In addition to the common type of files, files are also available in a veriaty of shapes for special applications.

Riffler files

These files are used for die-sinking, engraving and in silversmith's work. They are made in different shapes and sizes and are made with standard cuts of teeth.

Mill saw files

Mill saw  files are usually flat and have squre of rounded edges. These are used for sharpening teeth of wood working saws, and are available in single cut.

Crossing files

This  file is used in the place of a half round file. Each side of the has different curves. It is also known as fish back file.

Barrete file

This file has a flat, triangular face with teeth on the  wide face only. It is used for finishing sharp corners.

Tinker's file

This file has a rectangular shape with teeth only at the bottom face. A handle is provided on the top. This file is used for finishing automobile bodies after tinkering.

Rotary files

These files are available with a round shank. They are driven by a special machine with a portable motor and flexible shaft. Thes are used in diesinking and mouldmaking work

.

Machine files for hand filing machine

Machine files are of double cut, having holes or projection to fix to the holder of the filing machine. The length and shape will vary according to the machine capacity. These files are suitable for filing the inner and outer surfaces, and are ideal for diesinking and other tool-room work.