A double cut file has two rows of teeth cut diagonal to each other. The first row of teeth is known as OVERCUT and they are cut at an angle of 70 degree . The other cut, made diagonal to this, is known as UPCUT, and is at an angle of 51 degree . This removes stock faster than the single cut file
The grade of file tool is listed below
1. Rough
2. Bastard
3. Second Cut
4. Smooth
5. Dead Smooth
1) Rough File : A rough file is used for removing rapidly a larger quantity of metal. It is mostly used for trimming the rough edges of soft metal castings.
2) Bastard File: A bastard file is used in cases where there is a heavy reduction of material.
3) Second Cut File: A second cut file is used to give a good finish on metals. It is excellent to file hard metals. It is useful for bringing the jobs close to the finishing size.
4) Somooth File: A smooth file is used to remove small quantity of material and to give a good finish.
5) Dead Smooth File: A dead smooth file is used to bring the material to accurate size with a high degree of finish.
Body of flat chisel is usually made in the shape of Octagonal.
Cross-cut or cape chisels are used for cutting key ways, grooves and slots.
Snagging is a process used to remove the metal by Grinding.