Frame, ratio, and where it sits in the line
The GBX1600081385D is a planetary gearbox in Schneider's GBX series with a 160 mm external diameter, straight-cut teeth, and a single-stage 8:1 reduction, sized for servo or stepper pairing where backlash and torsional stiffness drive the fit decision. The housing is black anodized aluminium with a C 45 steel output shaft — a common pairing for cut-frame planetary units where the case carries the radial load and the shaft transmits the torque to the driven element.
Torque envelope and service life
Continuous output torque is 450 N.m, with a maximum output torque of 720 N.m — the 720 N.m figure is the peak/acceleration ceiling, not the steady-state rating, and the integrator needs to budget the application duty against the continuous number. Service life is rated 30000 h at 100 rpm at 30 °C, with the gear lubricated for life — the duty cycle is anchored to that reference speed and temperature, so a higher-velocity or higher-temperature application pulls the life curve down per the manufacturer's derating. Maximum radial load Fr is 4200 N at 100 rpm over the full 30000 h life, stepping to 6000 N if the duty is derated to 10000 h; maximum axial load Fa follows the same pattern at 6000 N / 8000 N — the load point is the mid-span of the output shaft, which is what the number represents.
Torsional stiffness, backlash, and inertia
Torsional rigidity is 38 N.m/arcmin and maximum torsional backlash is 6 arc.min — the 6 arc.min figure puts it in the standard-precision planetary tier rather than the sub-arc-min low-backlash class, which is the threshold that decides whether a motion-control axis needs a higher-grade unit. Moment of inertia is 4.63 g.cm², which matters when the gearbox is paired with a high-acceleration servo: low reflected inertia on the input side keeps the drive's torque loop stable and avoids the underdamped response that shows up as audible cogging on slow moves.
Environment, mounting, and acoustic profile
Operating ambient range is -25...90 °C, the shaft seal carries an IP54 rating, and the unit mounts in any position — the IP54 figure protects the seal lip against splash and dust, not against washdown, so a food-and-bev or outdoor deck application needs a higher-rated cover over the output. Efficiency is 96 % and noise level is 70 dB at 1 m on no-load — the 96 % efficiency is the single-stage planetary norm and means roughly 4 % of the input power is converted to heat in the gear train, which the housing then has to reject; the 70 dB figure is no-load and will rise under load.