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close this bookGrinding of Simple Tools - Course: Technique for Manual Working of Materials. Trainees' Handbook of Lessons
View the document(introduction...)
View the document1. Purpose of grinding
View the document2. Machines for grinding
View the document3. Tools for grinding
View the document4. Operation of grinding
View the document5. Operation of whetting
View the document6. Examples for off-hand sharpening with straight wheels
View the document7. Hints for mounting and dressing of grinding wheels
View the document8. Labour safety recommendations

1. Purpose of grinding

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?