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Sharpening is grinding and whetting of tools after their manufacture in order to prepare the cutting edges for use, i.e. mainly in metal cutting processes.
Furthermore, dull, worn out tools are made serviceable again by this technique. There are two different techniques:
Off-hand sharpening and sharpening by means of fixtures or special grinding machines.
Figure 1 - Off-hand sharpening
Off-hand sharpening can be done any time and without much preparations on any grinding machine as soon as a tool that was used has become dull. Therefore, this technique should be perfectly mastered. Permanent exercise and practise is required so that the technique is not unlearned. By off-hand sharpening, the following tools can be sharpened:
Steel scribers and scribers of beam trammels and scribing blocks; punches, chisels and drills of all kinds; screw drivers and scrapers.
What is the advantage of off-hand
sharpening?
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