Stober 1 Servo Gear Units

Technical Reference
Values and Symbols
Value
Symbol Description Imperial Multiplier Metric
F 2a Axial Force @ Output Shaft
F 2A Permissible Axial Force
F 2r Radial Force @ Output Shaft
lbs. 4.45 N
F 2R Permissible Radial Load
F 2RB Acceleration Permissible Radial Load
f B Load Factor — — —
i Reducer Ratio — — —
J D Motor + Reducer Inertia @ Motor RPM
J Z Total Inertia @ Reducer RPM
M Torque
M 2 Application Torque
M 2e Equivalent Torque (Average RMS Torque)
M L Friction Torque (Losses)
M 2b Application Acceleration Torque
M 2B Reducer Acceleration Torque
M 2K Reducer Tilting Moment
M 2KB Reducer Acceleration Tilting Moment
M 2N Reducer Nominal Output Torque
M 2peak Application Peak Torque
M 2PEAK Reducer Peak Torque
M 2V Application Deceleration Torque
n Speed
n b Acceleration Speed
nv Deceleration Speed
n 1 Input Speed
n 2 Reducer Output Speed
t Time
t b Acceleration Time
t d Duration Time
t v Deceleration Time
t p Pause Time
t r Running Time
lb-in-s 2 1.13×10 3 kgcm 2
in.lbs. 0.113 Nm
RPM — min -1
seconds — seconds
Conversions
Imperial to Metric
1 inch x 25.4 = mm
1 in 2 x 645.16 = mm 2
1 lb x 0.453 = kg
1 US gal x 3.785 = L
1 HP x 0.746 = kW
1 lb x 4.45 = N
1 lb in x 0.113 = Nm
1 lb ft x 1.36 = Nm
1 lb ft x .1383 = kgm
1 lb in x .0115 = kgm
1 lb in 2 x 0.00029 = kgm 2
1 PSI x 0.0689 = bar
1 PSI x 0.00689 = N/mm 2
°F = 32 + 9/5 x °C
Metric to Imperial
mm x 0.03937 = inch
1 mm 2 x 0.0015 = in 2
1 kg x 2.205 = lb
1 L x 0.264 = US gal
1 kW x 1.341 = HP
1 N x 0.225 = lb
1 Nm x 8.85 = lb in
1 Nm x 0.737 = lb ft
1 kgm x 7.233 = lb ft
1 kgm x 86.798 = lb ft
1 kgm 2 (J) x 3418.0 = lb in 2 (WR 2 )
1 bar x 14.5 = PSI
1 N/mm 2 x 145.04 = PSI
°C = 5/9 (°F-32)
Formulas
0.2618 x Dia.(in) x RPM =
Feet/Minute
0.00314 x Dia.(mm) x RPM =
Meter/Minute
800.711.3588 • www.stober.com
Servo Gear Units V.28
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