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Conversion Chart Info

The following tables are to assist in conversion rates of inertia and torque data. Please see the information at the bottom of each table for examples on how to properly calculate the data provided in the tables. Please contact Servo Systems Co. with any questions pertaining to these calculations.


INERTIA CONVERSION TABLE

To convert from A to B multiply by entry in table.


A B lb-ft2 lb-ft-s2 or slug-ft2 lb-in2 lb-in-s2 oz-in2 oz-in-s2 kg-m2 kg-cm2 kg-cm-s2 g-cm2 g-cm-s2
lb-ft2 1 3.108 x 10-2 144 .373 2.304 x 103 5.968 4.214022 x 10-2 421.40 0.4297 4.214 x 105 429.71
ib-ft-s2 32.174 1 4.633 x 10-3 12 7.413 x 104 192 1.35582 1.356 x 104 13.825 1.356 x 107 1.383 x 104
lb-in2 6.944 x 10-4 2.158 x 10-4 1 2.590 x 10-3 16 4.144 x 10-2 2.926404 x 104 2.926 2.984 x 10-3 2.926 x 10-3 2.984
lb-in-s2 2.681 8.333 x 10-2 3.861 1 6.177 x 103 16 1.12985 x 10-1 1.130 x 103 1.152 1.130 x 106 1.152 x 103
oz-in2 4.34 x 10-4 1.349 x 10-5 6.25 x 10-2 1.619 x 10-2 1 2.59 x 10-3 1.829006 x 10-3 0.183 1.865 x 10-4 182.901 0.186
oz-in-s2 0.168 5.208 x 10-3 24.13 6.25 x 10-2 386.088 1 7.06155 x 10-3 70.616 7.201 x 10-2 7.0616 x 104 72.008
kg-m2 34176.16 0.727561 3,417.16 8.85073 54,674.5 141.162 1 10,000 10.1972 1 x 107 10,197.2
kg-cm2 2.373 x 10-3 7.376 x 10-5 0.3417 8.851 x 10-4 5.467 1416 x 10-2 1 x 10-4 1 1.0917 x 10-3 1,000 1.0197
kg-cm-s2 2.327 7.233 x 10-2 335.109 0.8679 5.362 x 103 13.887 9.806614 x 10-2 980.665 1 9807 x 105 1,000
g-cm2 2.373 x 10-4 7.376 x 10-8 3.417 x 10-4 8.851 x 10-7 5.467 x 10-3 1.416 x 10-5 1 x 10-7 10-3 1.0197 x 10-6 1 1.0197 x 10-3
g-cm-s2 2.327 x 10-3 7.233 x 10-5 0.3351 8.680 x 10-4 5.362 1.389 x 10-2 9.806614 x 10-5 .9807 10-3 980.667 1

Example: Convert a rotor inertia of 90 g-cm2 to oz-in-s2

The multiplier from the table above is 1.416 x 10-5

The new inertia = 90x 1.416 x 10-5 = 1.27 x 10-3 oz-in-sec2

TORQUE CONVERSION TABLE

To convert from A to B multiply by entry in table.


A B lb-ft lb-in oz-in dyne-cm N-m mN-m kg-cm g-cm
lb-ft 1 12 192 1.356 x 107 1.356 1.356 x 103 13.825 13.825 x 105
lb-in 8.333 x 10-2 1 16 1.130 x 106 0.113 1.13 x 102 1.152 1.152 x 103
oz-in 5.208 x 10-3 6.250 x 10-2 1 7.062 x 104 7.062 x 10-3 7.062 7.201 x 10-2 72.01
dyne-cm 7.376 x 10-8 8.851 x 10-7 1.416 x 10-5 1 10-7 10-4 1.0197 x 10-4 1.0197 x 10-3
N-m 0.7376 8.851 141.62 107 1 1,000 10.197 1.0917 x 104
mN-m 7.376 x 10-4 8.851 x 10-3 0.1416 104 10-3 1 1.0197 x 10-2 10.197
kg-cm 7.233 x 10-2 0.8679 13.877 9.8266 x 105 9.8066 x 10-2 98.066 1 1,000
g-cm 7.233 x 10-4 8.6801 x 10-4 1.389 x 10-2 980.67 9.8066 x 10-5 9.8066 x 10-2 10-3 1

Example: Convert a torque of 53 oz-in to kg-cm

The multiplier from the table above is 7.201 x 10-2

The new value of toque is 53 x 7.201 x 102 = 3.816 kg-cm