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  Filing - Metal Work by H. M. Adam and J. H. Evans, 1914

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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.


 
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