Hand Tools Archive

Re: Side fact, temperature change from planing..

Warren in Lancaster, PA
Seems like a month ago, when hard maple was being considered for tests, that I mentioned that a dull iron can overheat in use and lose its temper. And that this happens more easily with hard maple than other woods. And I am not talking about mineral streaks here, I am talking about normal Acer saccharum.

The truth is that this stuff does not happen in the 1/8 of an inch or 1/100 of an inch from the edge; we are talking about a very small region. One does not need to be able to see blue or any other discoloration to know this is happening. We learn this by noticing how the iron acts, not by being able to see actual damage. If an iron suddenly acts as if it has been overheated and it then requires a number of sharpening cycles to regain its former quality, this evidence suggests overheating.

This is the kind of thing one would not notice without a great deal of experience.

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