Im A Beginner And Doing My Very First Project Media Center For My Tv / Pc / Stereo / Gaming. Well Point Is I Done Ripped Down My sheet Goods And Now I Want To use My New Router To Trim My Boards 3/4 Oak - Problem Is Which Size Flush Trim Router Bit Do I Need Thats Where Im Lost ?
I don't understand what you mean by trim your board other than squaring and truing the edge, which is going to be tough with just a router. For a straight flush cut bit I would go with a 1/2 inch with 1/2 inch shank. The smaller the bit the easier it is on the router but the smaller the shank the easier it is for the shaft to snap, I would use a 1/2 shaft bit to be on the safe side.
If you are trying to do what a jointer does with a router, that is going to take some planning.
I think what you are asking is how to make the boards perfectly straight edged, or exactly the same size. I assume this is because you are ripping them down with a circular saw. I have the same issue when ripping plywood. I use a circular saw only, no table saw. It's easier to get them close and then use a flush trim bit to make them exact. I use a 1/2" shank flush trim bit with a bottom bearing. Either 1" inch or 1 1/2" should do it.
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