ext_84029 ([identity profile] gfish.livejournal.com) wrote in [personal profile] gfish 2007-02-07 02:52 am (UTC)

These were brazed carbide, though you can use HSS if you want to touch up the edge every minute. It had a profile radius of about 3 inches and a cutting bevel of about 100 degrees. The tool itself was made for the purpose, not just any old chisel:
Image

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