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Drafted walls

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I’ve been working with a part for weeks now where the walls are drafted at .6 deg, and the walls are .1775 high.  The walls form teeth for a wave guide.  I’m using opti rough to take the cavity down to .020” remaining, then a swarf mill operation to finish the walls.  The problem is, the simulation shows the part to be perfect, but the physical part is over cut by .005.  I have a +\- .0005 tolerance and I can’t figure out how what’s wrong.  Anyone have any suggestions?

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