Drew has some good advice. It will take a long flush trim bit with a top bearing. Spiral bit is best but expensive. You could also try a mirror cut for the final pass with a non bearing bit. I think I bought one from Chinazon for less than $60. Clamp the slabs down with a gap slightly less than the bit diameter and machine both faces in one final pass taking special care to keep the router base tight to the straight edge because it will try to pull away.
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Drew has some good advice. It will take a long flush trim bit with a top bearing. Spiral bit is best but expensive. You could also try a mirror cut for the final pass with a non bearing bit. I think I bought one from Chinazon for less than $60. Clamp the slabs down with a gap slightly less than the bit diameter and machine both faces in one final pass taking special care to keep the router base tight to the straight edge because it will try to pull away.
I have used Unistrut screwed down to a bench top and trued using a string and a circular saw to cut a true edge before - it works well.
I've done the mirror cut with a circular saw blade. Just use a thick wide tooth blade not the thin kerf.
^ "Book-matching" grain patterns?