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I'll bow to your expertise Sawin, I'm not a complete idiot yu know! I have an older brother who's a journeyman machinist. Probably much like yourself. I know I'd be lost without his knowledge and expertise on many of my prototype fabrication projects. Thanks for the heads up mate. Jomo

Okay...... http://www.tskgrinding.com/Articles.asp?ID=266 Jomo

It's been my experience that the expensive A8 steel chipper knives run on an 1800, on a high production crew, will last a month typically. Whereas the cheapo zenith knives of old could barely make a week. Not saying they haven't solved their problem since 5 or so years ago. But grade of steel...

Beware of chipper knives made by Zenith Cutting Corp, inferior steel a few years ago. Not sure about currently though. Jomo

Here's a link. http://www.matweb.com/search/datasheettext.aspx?matguid=12b36e60c17448e9a8180c8cb46cddd3 Any sharpening should be done under a coolant bath. Jomo

A8 Tool grade steel. Should have 8% chromium. You get what you pay for! Jomo