ABB
80
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Motors and Generators | Abb AC Servo motors
5
Conversion tables
Rotary Inertia (to convert from A to B, multiply by value in table)
B
A
gm-cm
2
oz-in
2
gm-cm-s
2
kg-cm
2
lb-in
2
oz-in-s
2
lb-ft
2
kg-cm-s
2
lb-in-s
2
lb-ft-s
2
or
slug-ft
2
gm-cm
2
1
5.46 x 10-3
1.01 x 10-3
10-3
3.417 x 10-4
1.41 x 10-5
2.37 x 10-6
1.01 x 10-6
8.85 x 10-7
7.37 x 10-8
oz-in
2
182.9
1
0.186
0.182
0.0625
2.59 x 10-3
4.34 x 10-4
1.86 x 10-4
1.61 x 10-4
1.34 x 10-5
gm-cm-s
2
980.6
5.36
1
0.9806
0.335
1.38 x 10-2
2.32 x 10-3
10-3
8.67 x 10-4
7.23 x 10-5
kg-cm
2
1000
5.46
1.019
1
0.3417
1.41 x 10-2
2.37 x 10-3
1.019 x 10-3
8.85 x 10-4
7.37 x 10-5
lb-in
2
2.92 x 103
16
2.984
2.926
1
4.14 x 10-2
6.94 x 10-3
2.98 x 10-3
2.59 x 10-3
2.15 x 10-4
oz-in-s
2
7.06 x 104
386.08
72
70.615
24.13
1
0.1675
7.20 x 10-2
6.25 x 10-2
5.20 x 10-3
lb-ft
2
4.21 x 105
2304
429.71
421.40
144
5.967
1
0.4297
0.3729
3.10 x 10-2
kg-cm-s
2
9.8 x 105
5.36 x 103
1000
980.66
335.1
13.887
2.327
1
0.8679
7.23 x 10-2
lb-in-s
2
1.129 x 106
6.177 x 103
1.152 x 103
1.129 x 103
386.08
16
2.681
1.152
1
8.33 x 10-2
lb-ft-s
2
or
slug-ft
2
1.355 x
107
7.41 x 104
1.38 x 104
1.35 x 104
4.63 x 103
192
32.17
13.825
12
1
Torque (to convert from A to B, multiply by value in table)
B
A
dyne-cm
gm-cm
oz-in
kg-cm
lb-in
Nm
lb-ft
kg-cm
dyne-cm
1
1.019 x 10-3
1.416 x 10-5
1.0197 x 10-6
8.850 x 10-7
10-7
7.375 x 10-8
1.019 x 10-8
gm-cm
980.65
1
1.388 x 10-2
10-3
8.679 x 10-4
9.806 x 10-5
7.233 x 10-5
10-5
oz-in
7.061 x 104
72.007
1
7.200 x 10-2
6.25 x 10-2
7.061 x 10-3
5.208 x 10-3
7.200 x 10-4
kg-cm
9.806 x 105
1000
13.877
1
0.8679
9.806 x 10-2
7.233 x 10-2
10-2
lb-in
1.129 x 106
1.152 x 103
16
1.152
1
0.112
8.333 x 10-2
1.152 x 10-2
Nm
107
1.019 x 104
141.612
10.197
8.850
1
0.737
0.101
lb-ft
1.355 x 107
1.382 x 104
192
13.825
12
1.355
1
0.138
kg-m
9.806 x 107
105
1.388 x 103
100
86.796
9.806
7.233
1
Material densities
Oz/in
2
lb/in
3
gm/cm
3
Aluminum
1.57
0.098
2.72
Brass
4.96
0.31
8.6
Bronze
4.72
0.295
8.17
Copper
5.15
0.322
8.91
Plastic
0.64
0.04
1.11
Steel
4.48
0.28
7.75
Mechanism efficiencies
Acme screw (bronze nut)
0.4
Acme screw (plastic nut)
0.5
Ball screw
0.9
Helical gear
0.7
Spur gear
0.6
Timing belt/pulley
0.9
Friction coefficients
(Sliding)
m
Steel on steel
0.58
Steel on steel (greased)
0.15
Aluminum on steel
0.45
Copper on steel
0.36
Brass on steel
0.40
Plastic on steel
0.20
Linear bearings
0.001
Temperature
°F = (1.8 x °C) + 32
°C = .555 (°F - 32)
Gravity
(Acceleration constant)
g = 386 in/s
2
= 32.2 ft/s
2
= 9.8 m/s
2
Abb AC Servo motors