A standard cornerrounding end mill or ball mill works well for cutting convex or concave radii on workpieces using a manual lathe. After choosing the appropriate cutter, I clamp it in an Aloris-type toolholder at minimum overhang and speeds and feeds extremely minimize chatter.
For nonstandard radii too critical, I rotate the horizontal center. Doing smaller radius, but it takes to get the desired odd radius.
Worn or broken gundrills, especially those with diameters between 0.093 and 0.156 in., make perfect nozzles to clean holes. Simply tap the end of the holder and attach an air line — the tool's through hole delivers a concentrated air flow that easily reaches into tight areas. Richard Kurdyla
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Winner for July 2004: Lonnie Johnson, Idea runs rings around base-mounting problem, p.. 80.