The bit they used is/was 3 1/4" not 3 1/2". Also, OP no longer carries that bit. Somewhere here on the forums is listed a replacement bit that Freud makes. It will take some doing to find it.
Also, Bob & Rick were/are using routers that are of the 3+hp size. These have the power to turn those large bits and take on the full cut without problems. If you have a router that's smaller than the 3+hp range, then, yes, you have to take it in "bites".
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