Sean: Frank Klausz appears to eyeball his, some people use a gauge that has the proper angle on it. You can make one pretty easily too. Lee Valley sells some nice stuff for marking dovetails.

http://blog.lostartpress.com/2008/03...il+Angles.aspx

And the 14 deg marker:

http://www.leevalley.com/wood/page.a...=1,42936,50298

No I meant pulling our leg about caring about a .0015 gap in your dovetails. At what humidity did you determine that? Have you plotted it at other humidities? What I'm trying to say is, "Put it together and keep going, it doesn't matter as long as it's snug."