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Nice job Steve! That is a nice tool you've made there, at a fraction of the cost and effort of some of the more fancy tool / cutter grinder designs that are available. Thanks for sharing the details.One key point about tool sharpening in general - minimal force is needed to sharpen the tool, whether someone is using the side of a grinding wheel for sharpening, or a disc sander, or anything else. I think people pushing against grinding wheels too hard caused some of the safety rules about grinding wheels to be needed! The disc sander approach is great because it will make a planar cut every time. For endmills, do you use a jig to check, grind, and re-check to get the lips all cut to the same end position?