Scraper

Chisel

Hacksaw

Reamer

The kind of cut and spacing of teeth

Arrangement of teeth on the file

Size and shape of the file

All of the above

High speed and pressure

Pressures not released during return stroke

Coolant not used

Any one of the above

To increase the friction between the file face and the job surface.

To give better distortion of the pressure and to compensate slight filing movement.

To reduce the friction between the file face and the job surface.

To reduce the effort in driving a file.

Improper clamping of workpiece

Workpiece having blowholes

Centre punch mark not being large enough to give proper seat to the chisel edge of drill

Any of the above