A face mill leaves a cloudy face on 6061 when the finish stock is 0.05 mm. The same tool with 0.3 mm stock looks bright. Feeds and speeds are the ones from the tool card.
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0.05 mm on a face mill in aluminum is often below the edge hone, so the tool rubs and smears. Leave enough finish stock that the insert actually cuts, commonly a few tenths, not a whisper.
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A cloudy face with a small stock is also a classic sign of a wiper insert running with too little stock to engage the wiper. Give it the stock the insert was designed to wipe.
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Do not fix rub by slowing the feed. Slower feed on a rubbing edge makes more heat, not a brighter face.
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