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Message: <blockquote data-quote="randallss7" data-source="post: 2092212" data-attributes="member: 24507"><p>files are to hard unless you temper them back, same as any tool steel after the quench.  I run all my tool steel blades through the temper oven 3 times 90minutes each run with a natural cool down between each run.  Temperature depends on steel and how hard/soft i want to make the particular blade.  When I was a kid and didn't have access to all the tools I have now, i would water grind files to a knife, then use a propane torch to heat the spine to a blue colour and let the heat work its way down to the edge, not very scientific but I made some good knives still in use today 25 years later.</p></blockquote><p></p>