When stacking up compound cuts to make an octagonal cylinder or other multi-faceted object, the minor error in each cut also compounds making the last piece fit less than well.
A better method I used for the tapered octagonal column ("tapered octagon" for short!) was to glue up the first seven facets then measure the exact part I needed for the eighth. Matching the miter angles of the part is easy, but usually there's confusion on how to measure the associated bevel angles. This short video (no, really! under 7 minutes!) shows how I did the measurement.
I'll also discuss an animation at the end that shows a bit of how the bevel angle relates to the included angle and stock thickness.
No math is used or harmed in this video; safe for all ages :)
Over the weekend, I renumbered all the videos (and renamed my local copies to match). Generally, a new video gets the next number, but videos that are in a series get point numbers. For example, #82 is the No Comment #2 series so each video is #82.1, #82.2, #82.3 etc to better know the order of the videos. A viewer on YouTube suggested numbering them all since he found one mid-series by chance and didn't have an easy way to see where he was at. Hopefully this helps, although I understand it can look confusing on, say, the Sculpted Mahogany Vanity build where the last video was #38.12 released after one of the Domino crib-sheet videos #56. I'm thinking the order in a series is more important than strict chronological order over all of them. Might be wrong; do that often :)