ing a scrap between opposite members to act as a temporary brace.
In some compound miter assemblies with multiple sides, I've seen craftsmen put the members together in several steps. They assemble two halves, then sand or joint the adjoining surfaces of the halves for a tight fit, and glue the halves together. This is commonly done when glu-
ing up blanks for lathe turnings where the strength of the glue joints are critical and even the tiniest gap in a joint could spell disaster when the stock is spinning at a high speed. PW
To calculate compound miter angles, you need a scientific calculator (about $12 at most office supply stores) with SIN,COS,TAN,and INV buttons. On some calculators, the INV button is labeled FUNC for "function." If you have a computer and use Microsoft Excel software, you can download a simple Compound Miter Calculator that I wrote from the Pop Wood web site: www.popwood.com
|
COMPOUND MITER CHART FOR THE TABLE SAW |
|
|
|
|
|
Slope |
4 sides butted Miter ang Bevel ang |
4 sides mitered Miter ang Bevel ang |
5 sides mitered Miter ang Bevel ang |
6 sides mitered Miter angBevel ang |
8 sides mitered Miter ang Bevel ang |
|
0 |
|
|
45 |
90 |
54 |
90 |
60 |
90 |
67.5 |
90 |
|
5 |
|
|
45.11 |
3.53 |
54.1 |
2.94 |
60.09 |
2.5 |
67.58 |
1.91 |
|
10 |
|
|
45.44 |
7.05 |
54.42 |
5.86 |
60.38 |
4.98 |
67.81 |
3.81 |
|
15 |
|
|
45.99 |
10.55 |
54.94 |
8.75 |
60.85 |
7.44 |
68.19 |
5.69 |
|
20 |
|
|
46.78 |
14 |
55.68 |
11.6 |
61.52 |
9.85 |
68.73 |
7.52 |
|
25 |
|
|
47.81 |
17.39 |
56.64 |
14.38 |
62.38 |
12.2 |
69.42 |
9.31 |
|
30 |
49.11 |
48.59 |
49.11 |
20.7 |
57.82 |
17.09 |
63.43 |
14.48 |
70.27 |
11.03 |
|
35 |
50.68 |
42.14 |
50.68 |
23.93 |
59.24 |
19.7 |
64.69 |
16.67 |
71.26 |
12.68 |
|
40 |
52.55 |
35.93 |
52.55 |
27.03 |
60.9 |
22.2 |
66.14 |
18.75 |
72.4 |
14.24 |
|
45 |
54.74 |
30 |
54.74 |
30 |
62.81 |
24.56 |
67.79 |
20.71 |
73.68 |
15.7 |
|
50 |
57.27 |
24.4 |
57.27 |
32.8 |
64.97 |
26.76 |
69.64 |
22.52 |
75.09 |
17.05 |
|
55 |
60.16 |
19.21 |
60.16 |
35.4 |
67.38 |
28.78 |
71.68 |
24.18 |
76.64 |
18.26 |
|
60 |
63.43 |
14.48 |
63.43 |
37.77 |
70.04 |
30.59 |
73.9 |
25.66 |
78.3 |
19.35 |
|
65 |
67.09 |
10.29 |
67.09 |
39.86 |
72.93 |
32.19 |
76.29 |
26.94 |
80.07 |
20.29 |
|
70 |
71.12 |
6.72 |
71.12 |
41.64 |
76.05 |
33.52 |
78.83 |
28.02 |
81.94 |
21.07 |
|
75 |
75.49 |
3.84 |
75.49 |
43.08 |
79.35 |
34.59 |
81.5 |
28.88 |
83.88 |
21.7 |
|
80 |
80.15 |
1.73 |
80.15 |
44.13 |
82.81 |
35.37 |
84.27 |
29.52 |
85.89 |
22.12 |
|
85 |
85.02 |
0.44 |
85.02 |
44.78 |
86.38 |
35.82 |
87.12 |
29.87 |
87.93 |
22.43 |
|
90 |
90 |
0 |
90 |
45 |
90 |
36 |
90 |
30 |
90 |
22.5 |
|
Slope |
10 sides mitered Miter ang Bevel ang |
12 sides mitered Miter ang Bevel ang |
16 sides mitered Miter ang Bevel ang |
20 sides mitered Miter angBevel ang |
24 sides mitered Miter ang Bevel ang |
|
0 |
72 |
90 |
75 |
90 |
78.75 |
90 |
81 |
90 |
82.5 |
90 |
|
5 |
72.06 |
1.54 |
75.05 |
1.29 |
78.79 |
0.97 |
81.03 |
0.78 |
82.53 |
0.65 |
|
10 |
72.26 |
3.08 |
75.22 |
2.58 |
78.92 |
1.94 |
81.13 |
1.56 |
82.61 |
1.3 |
|
15 |
72.58 |
4.59 |
75.49 |
3.84 |
79.12 |
2.9 |
81.3 |
2.32 |
82.75 |
1.94 |
|
20 |
73.02 |
6.07 |
75.87 |
5.08 |
79.41 |
3.83 |
81.53 |
3.07 |
82.95 |
2.56 |
|
25 |
73.59 |
7.5 |
76.35 |
6.28 |
79.78 |
4.73 |
81.83 |
3.79 |
83.2 |
3.16 |
|
30 |
74.28 |
8.89 |
76.94 |
7.43 |
80.23 |
5.6 |
82.19 |
4.49 |
83.5 |
3.74 |
|
35 |
75.1 |
10.21 |
77.62 |
8.54 |
80.75 |
6.42 |
82.61 |
5.15 |
83.84 |
4.3 |
|
40 |
76.02 |
11.46 |
78.4 |
9.58 |
81.34 |
7.2 |
83.08 |
5.77 |
84.24 |
4.81 |
|
45 |
77.06 |
12.62 |
79.27 |
10.55 |
81.99 |
7.93 |
83.61 |
6.35 |
84.68 |
5.3 |
|
50 |
78.2 |
13.7 |
80.23 |
11.43 |
82.71 |
8.6 |
84.19 |
6.88 |
85.16 |
5.74 |
|
55 |
79.44 |
14.67 |
81.26 |
12.24 |
83.49 |
9.2 |
84.81 |
7.36 |
85.68 |
6.14 |
|
60 |
80.77 |
15.53 |
82.37 |
12.95 |
84.32 |
9.73 |
85.47 |
7.79 |
86.23 |
6.5 |
|
65 |
82.18 |
16.27 |
83.54 |
13.56 |
85.19 |
10.19 |
86.17 |
8.15 |
86.82 |
6.78 |
|
70 |
83.66 |
16.88 |
84.76 |
14.09 |
86.11 |
10.56 |
86.9 |
8.45 |
87.42 |
7.05 |
|
75 |
85.19 |
17.38 |
86.03 |
14.49 |
87.05 |
10.87 |
87.65 |
8.7 |
88.05 |
7.24 |
|
80 |
86.77 |
17.72 |
87.34 |
14.75 |
88.02 |
11.09 |
88.42 |
8.89 |
88.69 |
7.39 |
|
85 |
88.38 |
17.91 |
88.66 |
14.97 |
89.01 |
11.17 |
89.21 |
8.96 |
89.34 |
7.5 |
|
90 |
90 |
18 |
90 |
15 |
90 |
11.25 |
90 |
9 |
90 |
7.5 |
|
Note:The slope is measured from horizontal, with the assembly resting |
on a bench or work surface. |
|
|
|
|
www.popwood.com
65
