If bending a 6” single cut oval and knocking teeth off is the only way to get that textured finish so be it. Rasp burrs are not just for wood. I’ve actually used a wood specific rasp burr (as well as a rasp file) on aluminum angle and fabricated 6061 brackets to round over cuts and shape corners, aggressively, in years past. It leaves a very coarse finish just doing that, using it in a typical way. Varying pressure can leave the finish relatively smooth or rutted/gouged. Used other ways it may be possible, maybe not. Use a Dremel and grind every other tooth down, make it coarser, I rule out nothing. The guy that came up with a bent single cut burr with teeth knocked off is an example. Experimentation. He may have already tried a rasp type burr and it failed, who knows
Here’s what a Nicholson “wood rasp” file can do in about 10 seconds on the surface using firm pressure and then the edge really laying into on some 6061 aluminum (looks like a Squirrel or Beaver gnawed on it)
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I’ll have to dig out my rasp burr and see what finish I can attain on scrap. Using a slow drill.
