I'd venture to say that a light pass is taking off only a few thousandths of an inch and 0.005" is as heavy as I'd want to take on one pass.
.005" with a grinder isn't going to happen. Sorry but it sounds like you've never been around a machine shop or machinist much. These grinders have way more play than .005" you'd be lucky to see less than .020" and that would be one hell of a grinder.
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