14. HOW TO DETERMINE CUTTING RATE
OR TIME
CORRESPONDING AREAS IN
SQUARE INCHES
After selecting the desired cutting rate from the
foregoing charts, locate the same point on Column
3 of Nomograph 2. Now compute the cross sectional
Area
Area
Diameter
Diameter
area of the work piece and locate it on Column 1 of
Inches
6
28.27
Nomograph 2. Now place a straight line from the
6 1-8
29.47
Column 1 point to the Column 3 point and read the
.11
6 1-4
3-8
30.70
cutting time required per cut from the intersecting
6 3-8
31.92
1-2
.20
point on Column 2.
6 1-2
9-16
.25
33.18
6 5-8
34.47
5-8
.31
When sawing conditions are set for the listed blade
3-4
.44
6 3-4
35.80
speed, blade tooth pitch, and cutting force, the time
.60
6 7-8
37.12
7-8
per cut should be similar to the time per cut. on
Nomograph 2. If not the cutting force can be ad-
7
1
.79
38.48
justed to increase or decrease the cutting time.
1 1-8
.99
7
1-8
39.87
7
1-4
1 1-4
41.30
1.22
When the cutting time is known it can be set on
7
3-8
42.72
13-8
1.49
Column 2 and a line from Column 1 through Col-
7
1-2
1 1-2
44.17
1.76
umn 2 will intersect Column 3 to give the present
7
5-8
1 5-8
45.66
2.07
cutting rate.
7
3-4
1 3-4
2.40
47.20
7
7-8
48.71
1 7-8
2.76
8
2
3.14
50.26
TABLE OF STEEL SECTION WEIGHT AND
8 1-8
2
1-8
3.55
51.85
CORRESPONDING AREA IN SQ. INCHES
8 1-4
2
1-4
53.50
3.97
8 3-8
2
3-8
4.43
55.09
8 1-2
2
1-2
56.74
4.90
Area of
Steel Section
8 5-8
58.43
2
5-8
5.41
Section in
Weight Per
8 3-4
2
3-4
60.00
5.93
Square inches
Foot - Pounds
8 7-8
61.86
2
7-8
6.49
147.05
500
9
450
132.35
3
7.06
63.61
3 1-8
9 1-8
117.64
7.67
65.40
400
9 1-4
3 1-4
350
102.94
8.25
67.20
9 3-8
300
88.23
3 3-8
8.95
69.03
9 1-2
3 1-2
250
73.52
9.62
71.00
3 5-8
10.32
9 5-8
200
58.82
72.76
3 3-4
11.04
9 3-4
150
44.11
74.50
3 7-8
11.79
9 7-8
29.41
76.59
100
26.47
90
4
12.56
10
78.53
23.52
80
4
1-8
13.36
10 1-8
80.52
20.58
70
4
1-4
14.18
10 1-4
82.50
17.64
60
4
3-8
15.03
10 3-8
84.54
50
14.70
4
1-2
10 1-2
15.90
40
11.76
86.60
4
5-8
16.80
10 5-8
30
8.82
88.66
4
3-4
17.72
10 3-4
20
5.88
91.00
4
7-8
18.67
2.94
10 7-8
10
92.89
9
2.68
5
19.63
11
8
2.35
95.00
5
1-8
7
11 1-8
2.05
20.63
97.21
5
1-4
21.64
6
1.76
11 1-4
99.50
1.47
5
3-8
5
22.69
113-8
101.62
5
1-2
4
1.17
11 1-2
23.75
104.00
3
0.88
5
5-8
11 5-8
24.85
106.14
2
0.58
5
3-4
25.96
11 3-4
108.40
1
0.29
5
7-8
27.11
11 7-8
110.75
15