Cutting a piece of metal with a hacksaw
(1) The work piece must be squarely fixed to the bench vice.
(2) The saw bench must be fixed squarely and the teeth pointing forward with at least 3 teeth of the saw blade resting on the work piece.
Filling a piece of metal with a file
(1) The work piece must be squarely fixed to the vice
(2) The file should be sharp and must be having a good handle