
Compound Angle :
The Miter angles on the faces (Angles on Faces) of the dovetail and the Saw Blade Bevel angles
created on each face are not necessarily equal as required by the Dovetail Calculator.
The Dihedral angles and Saw Blade Bevel angles created by unequal Angles on Faces can be solved using the Saw Blade Angle Calculator. 
Dovetail Calculator returns may be tested in the NonRectangular CrossSection Calculator.
For Plan Angle > 90° the value of μ required by this calculator is determined as follows.
(NOTE: Values for Plan Angle < 90° have not been tested in this calculator)
90°  Angle on Face —> MIT Projected Parallelogram Angle —> BEV Dihedral Angle between Projected Parallelogram and Side Face of Timber —> 180°  XDIH LAG Program Entries : (Set Select Entry Mode to Angular) Main Pitch : 90°  8.45862° = 81.54138° (MIT) Adjacent Pitch : 64.20764° (BEV) Total Deck Angle : 95.353548° (180°  XDIH) LAG Program Returns : Angle in Plan  90° = 115°  90° = 25° P2m = 25.00000° —> α Dihedral Angle between Projected Parallelogram and End Face of Timber 90°  P2a = 84.64645° —> YDIH C5m = 70.61383° C5a = 10.92755° C5m + C5a = 70.61383° + 10.92755° = 81.54138° —> β μ = arctan(tan YDIH sin β) arctan(tan 84.64645° sin 81.54138°) = 84.58792° NonRectangular CrossSection Calculator Entries : (Refer to the diagram for definitions and locations of angles) Miter Angle : μ = 84.58792° Bevel Angle : β = 81.54138° —> 90°  Angle on Side Face CrossSection Angle : α = 25.00000° —> 90°  Plan Angle Rectangle Width : 8 Rectangle Height : 8 (any value may be entered in this field) NonRectangular CrossSection Calculator Returns : MIT = 81.54138° (90°  Angle on End Face) BEV = 64.20764° (acute Projected Parallelogram Angle) XDIH = 84.64645° (Dihedral Angle on End Face) Blade Angle = 5.35355° (Blade Angle on End Face) YDIH = 84.64645° (supplement of Dihedral Angle on Side Face) Blade Angle = 5.35355° (Blade Angle on Side Face) CrossSection Triangle Dimensions: Slope = 8.82702 (Parallelogram on Deck: Side) Projected Triangle Dimensions: length along slope of MIT = 8.92409 (Projected Parallelogram: Side) 