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Angle Calculator™
How to use:  The Finisher

MC= Miter cut angle, P=Plumb cut angle, W=Whole angle, S=Seat cut angle & R=Right angle

• How to find Compound Miter Angles for Crown Molding:
  First determine which type of crown molding you're working with, 52/38° (on 52/38° molding the ceiling contact surface is 38° and the wall side is 52°) or 45° (on 45° molding the contact surfaces are both 45°)

• There are two different charts on this tool, one for each type of crown molding. The chart on the Miter Angle side reads for 45° crown molding and the chart on the Whole Angle side reads for 52/38°.

• Open the tool and fit into, or around the outside of the surfaces being checked.

• Read the dial on the Miter Angel side of the tool, using the correct chart for your material, scroll down the left column to find the wall miter angle that you found on the dial, now read across to the right. The center column reads saw bevel (blade/tilt) and the right column reads saw miter.

• When measuring and marking the crown molding for length, mark the bottom edge that will set against the wall, lay the crown molding flat on the saw. Set your saw to these settings for perfect compound miter cuts.

Example on the 45-degree side of the tool, a 90-degree corner will show 45-degree wall angle in the left column, center column saw bevel is 30 degrees, and saw miter is 35.3 degrees. These angles are the same for an inside or an outside corner; the only difference is the direction of the cut, long point for inside cuts, or short point for outside corners.

• How to find Miter Angles:
  Open tool and fit into, or around the outside of the surfaces being checked. Read the dial on the side of the tool marked (miter angle side), with index mark, marked with M set the saw to that angle, and make your cuts.

• How to find Miter Angles on an Elliptical Arch:
  On an elliptical arch, be sure that at least the first several inches of the tool, closest to the miter intersection, are touching the surfaces being checked. Depending on how tight the arch is, you may need to use a small block to hold the tool out enough to fit the area.

• How to find Whole Angles:
  Open the tool and fit into, or around the outside of the surfaces being checked. Read the dial on the side of the tool marked (whole angle side) using the index mark, marked with a P, this is the overall wall angle.

• How to find Right Angles:
  Open the tool and fit into, or around the outside of the surfaces being checked. Read the dial on the side of the tool marked (whole angle side) using the index mark, marked with an S, this is the right angle to the wall angle.

• How to find roof rafter Plumb Angles:
  Open the tool and fit into, or around the outside of the surfaces being checked. Read the dial on the side of the tool marked (whole angle side) using the index mark, marked with a P, this is the plumb cut angle for the roof rafters of this angle.

• How to find roof rafter Seat Angles:
  Open the tool and fit into, or around the outside of the surfaces being checked. Read the dial on the side of the tool marked (whole angle side) using the index mark, marked with an S, this is the seat angle for roof rafters of this angle.

• How to check wall angles for shallow areas like window stools:
  Use the slotted end of the blade, adjust the blade to fit the area, tighten thumbscrew and mark the material, or to read this degree, transfer a mark onto scrap material. Loosen the thumbscrew and slide blade to pivot around the square end of the blade, then using the index mark, read the degree.

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