Читать книгу The Boy Craftsman - A. Neely Hall - Страница 7

Be sure you understand the process of sharpening tools before you undertake to use the oil-and grind-stones.

All tools are not sharpened alike, and you will need to know the different ways in order to get their cutting edges the right shape to serve their different purposes.

Grinding is the most difficult part of the work, and most boys have trouble with it. One fault lies in using the grind-stone too frequently, grinding the edge of a tool when it requires only a little rubbing upon the oil-stone to put it in shape, and thus wearing down the tool unnecessarily. Again, by not keeping the stone sufficiently wet, the heat produced by the friction takes the temper out of the steel, making it soft and useless until retempered.

If you have a stone with a crank arrangement, it will be necessary to have some one turn it while you control the tool. The stone should be turned toward the grinder and the tools held upward so the stone grinds against the edge instead of from it. Move the tools sideways across the stone so as to wear it down evenly and help prevent the formation of ridges in the stone, which are very easily produced.