Roger - very nice work on those boxes.
About setting the tilt angle to get the letters to drop in flush - there is an equation you can use as a first pass. You can vary a little if the result is not what you wanted. If you know the kerf "K" of the blade (look at Mike's web site -
http://www.mikesworkshop.com/blades.htm - the blade thickness is very close to the kerf for the scroll saw) and you know how far you want the inlay to drop "D" (usually the thickness of the inlay to get it to lay flush, but there may be other considerations such as simulating relief carving or forming a self-frame), then set the table angle to
Angle = Arcsin(K/D).
Arcsin is the same as Inverse Sin on the Windows calculator. Remember to set the calculator to Degrees (not Radians).
For example:
Blade Kerf Drop Angle
FDUR1 0.011" 0.250" 2.5 deg
FDUR5 0.015" 0.250" 3.4 deg
FDUR5 0.015" 0.750" 1.1 deg
FDUR9 0.018" 0.750" 1.4 deg
Notice from the table:
the same Drop with a thicker Kerf requires a
larger Angle
the same Kerf with a greater Drop requires a
smaller Angle
These will get you in the ballpark. You might need a little trial and error on scrap wood to make sure.
Also note - you can fill in the pilot hole and any excess Drop (too thick a Kerf or to small an angle) with a mix of wood glue and sanding dust (saw dust is not fine enough). It seems to work best if the pilot hole is in the darker wood and use the dust from that wood to make the filler.