|Forum topic by Dadoo||posted 11-19-2007 08:02 PM||1715 views||0 times favorited||5 replies|
11-19-2007 08:02 PM
In reference to this post: http://lumberjocks.com/topics/559 I remember recently watching a woodworking show called The Woodwrights Shop, on PBS. In this particular show this host uses only non-electric tools…everything’s antique and done the way our forefathers did it. It’s really cool and worth watching.
So on this particular show, he was creating a thread cutter and he used an old discarded file for the blade. The only problem with files is that they are extremely hard and impossible to cut or “file” an edge to. (Except for Chinese files) (lol!) So what he did was to put the tip into a makeshift brick oven that was heated with a torch. You bring the file tip to a “redhot” state and then let it cool…slowly. This changes the molecular pattern in the metal making it maleable. Now you can easily “file” or grind out the edge shape of the particular tool you want.
Next, you reheat the tool edge to a redhot state again and this time, quench it quickly in ice cold water. This returns the steel to it’s original hardness. Now all that’s left is to sharpen the edge.
-- Bob Vila would be so proud of you!