Aligning surfacing bit to X and Y axis

I have a surfacing 0.86" bit. When I line it up am I using the side of the bit or directly down the middle of the router?

I always set my tool position by the center of it. Obviously you can do the math and find out where the outer edge will surface. Some software will compute the offset for it when you enter the dimensions of the bit. I don’t use Easel, so I can’t speak for what it does.

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I ever used the middle of the router,and I think the middle of the router is better.