Planetary gearbox for precision motion — 20:1 reduction in a 60 mm package
The GBX0600201401F is a 60 mm-diameter planetary gearbox from Schneider Electric's GBX series, delivering a 20:1 reduction ratio with straight-cut teeth. It's sized for servo or stepper motor output stages where compact diameter and predictable backlash matter more than helical quietness. Continuous output torque is 44 N.m at 100 rpm and 30 °C ambient, with a maximum intermittent torque of 70 N.m under the same conditions. The 20 arc.min maximum torsional backlash tells you this is a general-purpose positioning gearbox — not a zero-backlash unit for a C-axis, but fine for indexing, pick-and-place, or conveyor drives where the load doesn't reverse under tension.
Rated life, lubrication, and the sealed-for-life reality
Schneider lists this gearbox as obsolete. That means the factory last-time-buy window has closed — new production is no longer available from the manufacturer. Service life is rated 30,000 hours at 100 rpm and 30 °C, lubricated for life with no maintenance ports or regrease intervals. The IP54 shaft output seal keeps dust and splash out of the bearing cavity, but the housing itself is black anodized aluminium — not sealed against washdown. Plan the mounting orientation so the breather path (if any) doesn't trap condensation.
Shaft loading limits that govern the application
Maximum radial force at mid-span on the output shaft is 340 N for the full 30,000-hour life, or 500 N if you accept a 10,000-hour service life. Maximum axial force is 450 N at 30,000 hours, 600 N at 10,000 hours. These are the hard constraints for belt-drive or direct-coupling designs — overshoot them and the bearing race wears prematurely, not the gear teeth. Torsional rigidity is 2.5 N.m/arcmin, which means the gearbox winds up about 0.4 arcmin per N.m of load torque. For a positioning system with a 44 N.m peak, that's roughly 18 arcmin of windup at full load — the controller's gain loop needs to account for this compliance if the load reverses quickly.