What this gearbox delivers on a decommissioned line
The GBX1200201402F is a 120 mm-diameter planetary gearbox with a 20:1 reduction ratio, straight-cut teeth, and a black anodized aluminium housing. It was designed for servo or stepper motor output stages where compact coaxial mounting and predictable backlash matter. Continuous output torque is 260 N.m at 100 rpm, with a maximum intermittent rating of 416 N.m at the same speed — the continuous figure governs duty-cycle applications like indexing tables or conveyor drives that run steady loads. Rated service life is 30,000 hours at 100 rpm and 30 °C ambient, lubricated for life with no maintenance interval. A pull from a working line with documented runtime gives a buyer a direct read on remaining life.
Torque, backlash, and the real-world limits
Maximum torsional backlash is 12 arc-min — this is the angular play between input and output when reversing direction. For positioning axes that reverse frequently, that figure sets the repeatability floor; a lower-backlash gearbox would be needed for sub-arc-minute positioning. Maximum radial force on the output shaft is 1500 N at 100 rpm for the full 30,000-hour service life, or 2000 N if the application accepts a 10,000-hour life. Maximum axial force is 2100 N at 100 rpm for 30,000 hours, or 2800 N for 10,000 hours. These limits apply with the force applied at mid-distance from the output shaft. Torsional rigidity is 13 N.m/arcmin — the shaft wind-up under load. At the continuous torque of 260 N.m, the elastic wind-up is about 20 arc-min before the backlash gap is taken up. This matters for tension-control or registration applications where the gearbox stiffness adds to the servo loop compliance.
Sourcing an obsolete planetary gearbox
Schneider Electric lists this GBX series gearbox as obsolete — no longer in active factory production. Available through independent surplus and broker channels. A used pull from a decommissioned line with known runtime is a common supply path for this class of part. The shaft output carries an IP54 ingress protection rating — the rotating seal keeps out dust and splashing water, but the gearbox is not rated for washdown or submersion. The C 45 steel shaft and anodized aluminium housing handle typical factory-floor exposure.