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	½	85	44 ¾	85	29 ¾	87 ½	22 ¼	88
10	0.176	1 ½	80 ¼	44 ¼	80 ¼	29 ½	84 ½	22	86
15	0.268	3 ¾	75 ½	43 ¼	75 ¼	29	81 ¾	21 ½	84
20	0.364	6 ¼	71 ¼	41 ¾	71 1/4	28 ¼	79	21	82
25	0.466	10	67	40	67	27 ¼	76 ½	20 ¼	80
30	0.577	14 ½	63 ½	37 ¾	63 ½	26	74	19 ½	78 ¼
35	0.700	19 ½	60 ¼	35 ½	60 ¼	24 ½	71 ¾	18 ¼	76 ¾
40	0.839	24 ½	57 ¼	32 ½	57 ¼	22 ¾	69 ¾	17	75
45	1.000	30	54 ¾	30	54 ¾	21	67 ¾	15 ¾	73 ¾
50	1.19	36	52 ½	27	52 ½	19	66 ¼	14 ½	72 ½
55	1.43	42	50 ¾	24	50 ¾	16 ¾	64 ¾	12 ½	71 ¼
60	1.73	48	49	21	49	14 ½	63 1/2	11	70 ¼

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.