Continuous torque rating vs peak — sizing the GBX0800090702D for servo duty
The continuous output torque of 130 N.m is the sustained rating that governs thermal equilibrium in the gearbox — run it above this continuously and the black anodized aluminium housing (80 mm diameter) will exceed its 90°C ambient ceiling. The maximum output torque of 208 N.m is the peak ceiling for acceleration/deceleration transients, not for steady-state positioning. With a 9:1 reduction ratio, the input speed at the motor side is nine times the output speed. The 0.74 g.cm² moment of inertia reflected to the motor shaft becomes 0.74 × 9² = ~60 g.cm² — factor this into the servo tuning loop's inertia ratio calculation.
Backlash and torsional rigidity — positioning repeatability limits
Maximum torsional backlash is 17 arc.min — this is the lost motion at the output shaft when reversing direction. For single-direction indexing or continuous rotation it doesn't accumulate, but for bidirectional positioning with encoder feedback on the load side, the 17 arc.min deadband must be absorbed by the controller's backlash compensation or the position tolerance budget. Torsional rigidity of 6.5 N.m/arcmin means the shaft winds up 1 arcmin for every 6.5 N.m of applied torque. At the continuous rating of 130 N.m, expect ~20 arcmin of elastic windup under load — this is predictable and repeatable, so it can be compensated in the servo gain structure if the load torque is known.
The 30,000-hour service life at 100 rpm and 30 °C ambient is the L10 bearing life under those conditions. Derate the life expectancy if the output speed or ambient temperature exceeds those reference points — the axial and radial force ratings also drop at the extended 30,000-hour target vs the 10,000-hour rating.
Mounting and environmental fit
Mountable in any position — the lubricated-for-life charge stays distributed regardless of orientation. The shaft output seal is rated IP54, meaning it resists dust ingress and splashing water but not pressurized washdown or immersion. The C45 steel output shaft accepts standard keyed couplings or pinion gears. Noise level is 60 dB at 1 m under no-load conditions — this is below typical workshop ambient noise (70-80 dB) and comparable to a quiet office environment. Under load the noise will increase with torque and speed but stays within the straight-tooth planetary gearbox class.