3:1 planetary reduction at 96% efficiency
The GBX0400030403D: The 40 mm diameter black anodized aluminium housing keeps the envelope compact for direct mounting to a servo motor flange of the same frame size.
Load ratings and service life at 100 rpm
Rated service life is 30000 hours at 100 rpm and 30 °C — the load limits drop if you target a longer life: maximum axial force Fa is 200 N for a 10000-hour design life, or 160 N if you need the full 30000 hours. Maximum radial force Fr follows the same pattern — 200 N at 100 rpm for 10000 hours, 160 N for 30000 hours, with the force applied at mid-distance from the output shaft. The gearbox is lubricated for life, so there is no maintenance schedule for grease changes — one less item on the PM checklist.
Backlash and torsional stiffness for positioning
Maximum torsional backlash is 30 arcmin — this is a standard-precision planetary, not a zero-backlash unit, so it suits indexing and positioning where the load holds position between moves rather than reversing under load. Torsional rigidity is 1 N.m/arcmin — the shaft wind-up under rated torque is predictable, and the C 45 steel shaft material handles the bending moment from radial loads.