Black & Decker 81/4" COMPUND MITER SAW 9425 - Manual (Page 9)

Cutting Crown Molding
Your Compound Miter Saw is probably better suited to the difficult task of cut­
ting crown molding than any other tool made. In order to fit properly, crown mold­
ing must be compound mitered with extreme accuracy (see Figure 17).
The two surfaces on a piece of crown molding that fit flat against the ceiling
and the wail of a room are at angles that, when added together, equal exactly 90"^.
Most crown molding has a top rear angle (the section that fits flat against the ceil­
ing) of 52° and a bottom rear angle that fits flat against the wail of 38°.
In order to accurately cut crown molding for a 90° inside or outside comer,
refer to the chart that follows.
FOR ALL CUTS:
1. Molding laying with broad back surface down flat on saw table
2. The settings below are for All Standard (U.S.) crown molding with 52° and 38°
angles.
BEVEL POST
SETTING TYPE OF CUT
33.85°
LEFT SIDE, INSIDE CORNER;
1. Top of molding against fence
2. Miter table set right 31.62°
3. Save left end of cut
33.85°
RIGHT SIDE. INSIDE CORNER:
1. Bottom of molding against fence
2. Miter table set left 31.62°
3. Save left end of cut
33.85°
LEFT SIDE, OUTSIDE CORNER:
1. Bottom of molding against fence
2. Miter table set left 31.62°
3. Save right side of cut ______
33.85°
RIGHT SIDE. OUTSIDE CORNER:
1. Top of molding against fence
2. Miter table set right 31.62°
3. Save right side of cut
When setting bevel post and miter table angles for all compound miters,
remember that:
1. The settings are interdependent so that changing one changes the other as
well, and
2. The angles presented for crown moldings are very precise and difficult to set
exactly. Since they can easily shift slightly and very few rooms have exactly
square corners, ail settings should be tested on scrap molding.
PRETESTING WITH SCRAP MATERIAL (S EXTREMELY IMPORTANT!