7 Attachment(s)
Chisel Hardness Study, the first step.
As I aspire to someday make chisels I've begun a study of the chisels made by others. Since hurricane Harvey has pretty much shut down all outside activity today I did a series of measurements on chisels made by Blue Spruce, Robert Sorby, Marples and Pfiel. Here are the results.Attachment 419138Attachment 419139Attachment 419137
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The HRC of the various manufacturers covers quite a range from 58 for Robert Sorby up to the very hard 64 of the Blue Spruce butt chisels. Interesting that the softest chisels of the bunch also have the lowest standard deviation. More later.