I finally figured out why my drilled holes keep walking on 6061 plate

Turns out I was hitting it with 1800 RPM on the spindle when a guy at the shop in Everett told me to drop to 900 and peck a 1/8 pilot first, and my hole locations tightened up to within .002 on 40 parts straight, so what RPM are you all running on aluminum plate?

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