Planetary gearbox for servo/motion axes — 60 mm frame
The GBX0600080703F is a straight-tooth planetary gearbox in the GBX series, 60 mm housing diameter, designed to bolt onto a servo motor face and step down speed by 8:1 while multiplying torque. Continuous output torque is 18 N.m at 100 rpm and 30 °C; maximum intermittent torque reaches 29 N.m under the same conditions — the continuous figure governs sizing for a duty cycle above 60 %. Rated service life is 30,000 hours at 100 rpm and 30 °C, lubricated for life — no field regreasing interval, so the seal condition and operating temperature drive the actual service life in a real cabinet.
Sourcing reality — obsolete, quoted per RFQ
Schneider Electric lists the GBX0600080703F as obsolete. Available through independent surplus and broker channels. For a direct mechanical replacement, confirm the motor shaft diameter, pilot diameter, and bolt pattern of the existing GBX0600080703F against any candidate — the 60 mm housing and 8:1 ratio are parametric, but the interface dimensions changed across generations.
Backlash, loads, and environmental limits
Maximum torsional backlash is 16 arc.min — this is a standard-precision grade, not a low-backlash unit. For positioning axes that reverse direction under load, the lost motion at the output can exceed one degree; a preloaded or dual-gear reducer would be needed for tighter registration. Maximum radial force on the output shaft is 340 N at mid-span (30,000 hour life) and 500 N (10,000 hour life), both at 100 rpm. Axial force limits are 450 N and 600 N respectively. These are the bearing life limits — overshoot them and the service life drops non-linearly. Shaft output seal is rated IP54 — splash-resistant but not washdown. The housing is black anodized aluminium; the shaft is C45 carbon steel. Operating ambient range is -25 °C to +90 °C.
Efficiency and noise — what the numbers mean
Rated efficiency is 94 % — this is the mechanical loss through one stage of straight-tooth planetary gearing at full load. The remaining 6 % becomes heat conducted into the motor shaft and housing; for a continuous 18 N.m output at 100 rpm (about 188 W mechanical), the heat loss is roughly 12 W. Noise level is 58 dB at 1 m, no-load — this is a free-running measurement without output load. Under load the gear mesh whine typically rises 3–5 dB. The straight-tooth profile is inherently noisier than helical; if acoustic limits are tight, a helical planetary would be quieter at the same ratio.