Need some guidance/suggestions on the easiest/best way to cut the taper on a thru mortise in a post (8 x 8) that will ultimately house a dovetail tenon on the end of a cross beam. I have tried to cut a few with a framing chisel but have not mastered that technique, and I am not happy with the results. I do have a chain mortiser but is it safe to cut a taper with that? Any set up tips or techniques would be appreciated. As always, thanks for your time and sharing your knowledge with a beginner.