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The New Zealand Railways Magazine, Volume 2, Issue 9 (January 1, 1928)

Forging and Grinding of Tools

Forging and Grinding of Tools.

It is sometimes claimed that tools should be forged, and that the cutting properties are enhanced thereby. This was possibly true half a century ago, but it is most certainly not true to-day.

Modern tool steel, if subjected to uncertain temperatures and hammering at heats under or above certain limits, loses its most essential properties. Strict obedience to the manufacturer's instructions is the only sure means of obtaining the best results. Forging in some instances cannot be avoided; but the modern method of grinding, which covers a very large range of tools, is the desirable method. Experience has conclusively proved that intelligent grinding has no deleterious effect on high-speed steel.