Woodworkers Club of Houston

 

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Compound Miter and Bevel Angles

 

 

 

    Four-Sided Butt      Four-Sided Miter   Six-Side Miter   Eight-Sided Miter  

Tilt of Work

In Deg

Equivalent Taper

per Inch

Bevel Degrees

Miter Degrees

Bevel Degrees

Miter Degrees

Bevel Degrees

Miter Degrees

Bevel Degrees

Miter Degrees

5

0.087

85

44

85

29

87

22

88

10

0.176

1

80

44

80

29

84

22

86

15

0.268

3

75

43

75

29

81

21

84

20

0.364

6

71

41

71 1/4

28

79

21

82

25

0.466

10

67

40

67

27

76

20

80

30

0.577

14

63

37

63

26

74

19

78

35

0.700

19

60

35

60

24

71

18

76

40

0.839

24

57

32

57

22

69

17

75

45

1.000

30

54

30

54

21

67

15

73

50

1.19

36

52

27

52

19

66

14

72

55

1.43

42

50

24

50

16

64

12

71

60

1.73

48

49

21

49

14

63 1/2

11

70

 

For flat or upright polygons, use these miter and bevel settings:

 

No of Sides

3 Triangle

4 Square

5 Pentagon

6 Hexagon

7 Heptagon

8 Octagon

9 Nonagon

10 Decagon

11 Undecagon

12 Dodecagon

Miter (in deg)

30

45

54

60

64.17

67.5

70

72

73.38

75

Bevel (in deg)

N/A

45

36

30

25.83

22.5

20

18

46.62

15

O.C. Factor

1.732

1.414

1.176

1.00

.868

.765

.684

.618

.563

.518

I.C. Factor

.289

.5

.688

.866

1.038

1.207

1.374

1.538

1.702

1.866

 

O.C. is outside diameter of polygon, I.C. is inside diameter

 

To find the inside length of each segment, divide radius of the inside circle by the I.C. Factor.

To find the outside length of each segment, multiply radius of the outside circle by the O.C. Factor.

 

The inside circle is the largest circle that would fit inside the polygon.

The outside cicle is the smallest circle that would fit outside of the polygon.

 

Table and radial arm saw bevel: Tilt the blade.

Table saw miter: Set the miter gauge.

Radial arm saw miter: Swing the arm.