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How can I renew burrs?

Renewing Burrs

If you're sick of throwing your worn burrs away, try this: First, clean your worn burrs thoroughly.I use a 20% sodium hydroxide solution warmed on a hot plate followed by steam cleaning. Dip the cleaned burrs in concentrated nitric acid and let the acid work for a half minute or less, then steam clean again. Your burrs should be sharpened. Nitric acid doesn't work on high speed steel and some other metals. The burrs will be slightly smaller each time you repeat the process. The results are just short of miraculous.

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