milling heads for comp ratio increase

what people don't know is that you should get the heads squared up with resurfacing equipment first. You can’t just set a head onto a fixture, clamp it down and start cutting. You have to line it up so the surface is parallel with the cutter head fore-and-aft, and side-to-side. Once you’ve done that you can set your depth of cut and proceed with a rough cut or finish cut. Getting heads milled the right way cost alot of money!!!