As you are aware, routing across end-grain caries the danger of tear-out. The best solution I have found is to use lead-in and trail-out pieces clamped firmly to the work-piece. Depending upon the configuration of the assembly you can cut with the assembly flat against the table, or perpendicular to the table by clamping the assembly to a thick piece of stock and sliding the now-vertical assembly (firmly) against a fence and past the cutter. If you have over-sized stock you can cut the end-grain first, then cut the stock to size to remove any irregularities (tear out) and then cut the parallel grain. If the work-piece is of a configuration that militates against clamping anything to it, glue the lead-in and trail-out pieces to it, make your cross-grain cuts, and then remove the glued-on pieces with a saw or other appropriate cutter.
Last edited by Peter M; 08-14-2015 at 08:01 AM.
Reason: crap sentence