The position of the work is most
important in filing, and should be just above the worker’s
elbow. But as the work must also be firmly gripped in the vice,
and not too high above the jaws, it is important that the top of
the vice should be on the elbow level.
To hold the file, only one method
is adopted for the right hand, and by referring to Fig. 30 it
will be observed that the end of the handle is allowed to rest
in the palm of the hand, and the fingers close round it, with
the index-finger upon the top or along the side of the handle.
Three methods are allowed of holding with the left hand, each
with its peculiar advantage.
These three methods are shown in
Figs. 30, 31, and 32. For Fig. 30 allow the tip of the file to
rest against the palm of the hand, and grasp firmly with the
four fingers under the file. By this method the whole weight of
the body can be comfortably applied to the file, and is used
when a quantity of material is to be removed.
For Fig. 31 place the two first
fingers under the tip of the file, and the thumb on top. This
method of holding is useful for lighter work and for small
files, and allows a perfect command for change of position or
direction during the working of shaped or curved exercises, and
also A allows the file to be applied in any particular place.
For Fig. 32 extend the thumb as far
as possible from the fingers, and then place the hand on top of
the file, with the extreme finger- tips at the end. By this
method the run of the file can be felt, and any tendency to get
the work out of the flat detected, whilst at the same time it
allows a fair, even pressure.
This method also allows the whole
length of the file to be used. It must always be remembered that
the file cuts on the forward stroke only, and it is during this
stroke that the pressure must be applied, always proportionate
to the size of the file and the work being done. Whilst it is
not necessary to lift the file on the return stroke, no pressure
should be applied, but rather a tendency to ease up the weight.