Using a Table Saw to Rip a board at an Angle

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Minimum Guide Board Length

We can figure out how long our guide board needs to be by using trigonometry assuming we know the angle of the cut and the width of the board to taper. This will obviously need to be longer if we want to add guides.

Image AddedFiguring out length by using width of board and angle

If you know the angle and width of board, you can calculate the length at which the cut will exit the board.

Tan Sin (angle) = opposite / adjacent hypotenuse

Opp = board width (BW)

Hyp = guide board length (GBL)

sinTan(6) = widthBW/lengthGBLlength

GBL = width BW/sin(ANGLE)

Given

Angle = 6°

BW = 4.25"

GBL Tan(6) = 5.25" / Tan Sin(6) = 49.95" = 4'2  50.22"

References