I have a piece of 10 foot crown I need to cut (outside corners). I'm having a problem keeping the piece square. My cut on the short piece is fine but the cut on the longer piece is not fitting.
I believe it is due to the fact that when I miter the long piece is not square in the saw.
I'm using the Rockler crown jig. Is there any way of making sure the long piece is square in the saw without getting too sophisticated?

thanks
Len Perno