Planetary gearbox for precision motion control
The GBX0800080701D is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for servo and stepper motor applications that demand a compact, backlash-controlled reduction stage. With an 8:1 reduction ratio and 80 mm housing diameter, it fits into the driveline where a single-stage planetary delivers the torque multiplication without the length penalty of a two-stage box.
Torque capacity and service life at the operating point
Continuous output torque is 50 N.m, with a maximum intermittent rating of 80 N.m — the margin covers acceleration peaks and emergency stops without oversizing the gearbox for the steady-state load. Service life is rated at 30,000 hours at 100 rpm and 30 °C ambient, which is the baseline for sizing: running at higher speed or temperature reduces the L10 life, and the gearbox is lubricated for life with no maintenance interval. The 96 % efficiency figure means the thermal loss at rated torque is low enough that the black anodised aluminium housing dissipates the heat without forced cooling in most continuous-duty cycles.
Backlash and stiffness for positioning accuracy
Maximum torsional backlash is 12 arcmin, placing this gearbox in the standard-precision class — adequate for indexing and positioning where the load does not reverse direction frequently, but not for zero-backlash servo axes that need a preloaded or helical stage. Torsional rigidity is 6 N.m/arcmin, so the wind-up under the 50 N.m continuous load is about 8 arcmin of elastic deflection on top of the 12 arcmin geometric backlash.
Mounting and environmental limits
The gearbox can be mounted in any position, which simplifies integration into vertical or inverted drive trains without a separate oil-breather or vent orientation. Shaft output is rated IP54, meaning it is protected against dust ingress and splashing water — suitable for machine-tool enclosures and dry industrial environments, but not for washdown zones. Operating ambient temperature spans -25 to 90 °C, covering most indoor industrial conditions; the lubricant's viscosity range is the limiting factor at the low end.