A 25 mm hole is opened with a 12 mm end mill on a helix. The top is round. The last 3 mm chatters and the bore is oval there. The helix pitch is 1 mm and the tool is buried for the full depth at the end.
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When the helix reaches the floor, a flat end mill loads the center and the periphery at once if you finish with a full-width bottom. Stop the helix short, then circle the wall with the end of the tool above the floor, and face the floor separately if it matters.
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Oval only at the bottom is the tool deflecting when it is fully engaged, not a bad hole at the top. A lighter radial step on the last circles fixes the oval.
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If the floor does not need to be finished by this tool, retract before the flutes rub the floor. Rubbing is the chatter you hear.
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