5:1 reduction, 40 N.m continuous — sizing the duty envelope
The GBX0600050583D: The 5:1 reduction ratio sets the speed/torque transformation: input speed is reduced by a factor of five while output torque is multiplied by the same ratio, minus the 96 % efficiency loss. That 96 % figure is the mechanical efficiency through the planetary stage — only 4 % of the input power is lost as heat, which keeps the 60 mm black anodised aluminium housing within its thermal budget in continuous duty. Continuous output torque is 40 N.m, with a maximum peak of 64 N.m for transient loads. The gap between continuous and peak is the overload margin — a servo application that cycles above 40 N.m needs to stay under 64 N.m and respect the duty cycle implied by the 30000-hour service life at 100 rpm and 30 °C.
Stiffness, backlash, and load ratings — what they mean for positioning
Torsional rigidity is 2.3 N.m/arcmin — under a 40 N.m continuous load the output shaft twists about 17 arcminutes. That windup is repeatable and can be compensated in the controller if the application demands it, but it sets a floor on positioning accuracy. Maximum backlash is 20 arc.min, which is standard precision for a straight-tooth planetary — not a low-backlash or zero-backlash grade, so a pick-and-place or indexing axis that needs under 10 arcmin of lost motion needs a different gearbox variant. Maximum axial force on the output shaft is 450 N at 100 rpm for the full 30000-hour life, or 600 N if the application only needs 10000 hours. Radial force limits are 340 N and 500 N respectively, measured at mid-span on the output shaft. These are the bearing-life ratings — exceeding them shortens the service life below the 30000-hour baseline, not an immediate failure threshold.
Mounting, sealing, and environmental fit
The gearbox mounts in any position, which simplifies integration into existing machine layouts — horizontal, vertical shaft-up, or vertical shaft-down all work without derating. The shaft output seal is rated IP54, meaning it is protected against dust ingress and splashing water, but not against pressurised washdown or immersion. In a food-processing or washdown zone, the IP54 shaft exit needs a secondary cover or boot if the machine is hosed down directly. Ambient operating range is -25 to 90 °C, which covers most indoor industrial environments and unheated warehouses. The gearbox is lubricated for life — no oil-change interval, no breather, no maintenance schedule for the lubrication system. The C 45 steel shaft is standard medium-carbon steel, hard-wearing but not stainless; in a corrosive atmosphere the shaft extension may need a protective coating.
Noise and inertia — acoustic and dynamic profile
Noise level is 58 dB at 1 m, no-load — roughly the sound of a quiet office or a library. Under load the noise rises, but the straight-tooth planetary mesh is inherently noisier than a helical stage; if the gearbox is mounted on a resonant structure or near an operator station, the 58 dB no-load figure is a floor, not a guarantee. Moment of inertia reflected to the input is 0.078 g.cm² — low enough that a small servo or stepper motor can accelerate the gearbox without a significant torque penalty for the rotor inertia.