I wouldn't do it in one pass. That's a lot of wood. I also wouldn't use
a full-width bit, as generally speaking the stuff you're putting *into*
the dado isn't exactly 3/4".
Better to use one of the jigs posted earlier with a 1/2" bit.
As for speed, that depends on the specific bit. You might look at this
I've routed 3/4 X 3/8 deep in one pass many times. My router is a DeWalt
618. I've left mine on the highest speed and plowed through as the router
would take it. I've also done it in two passes. I guess it depended on how
much of a hurry I thought I was in or if I was feeling gutsy or something.
Try a scrap. If it does not route through well then reduce the depth of cut
and do it in two passes. If you're really concerned about router speed -
read your manual. What does it suggest? What does it suggest for depth of
Both of these questions can well be answered by the information found in
most router manuals. It does pay to read the manual.
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