SEW-EURODRIVE launches budget-friendly gear units for everyday factory robots
The German automation company has added three lower-cost planetary gear units to its PxG line, giving machine builders a way to stop over-engineering standard packaging and assembly machines.
Key points
- SEW-EURODRIVE introduced the PxG economy series in 2025, adding three new gear unit grades below its existing precision range.
- The P1.G, P2.G and P3.G units cover peak torque ratings from 11 to 500 Newton metres across five sizes.
- Rated service life exceeds 20,000 hours, matching the longevity of the higher-precision models in the same family.
- Target machines include packaging lines, carton erectors, gantry robots and assembly equipment with low to medium mechanical demands.
Not every robot arm needs a sports-car gearbox. That's the core idea behind SEW-EURODRIVE's PxG economy series, a line of planetary gear units that translate a motor's spinning shaft into controlled, torque-rich movement. The Bruchsal-based company, founded in 1931, already sold the PxG family in high-precision grades (P5.G, P6.G and P7.G). The new P1.G, P2.G and P3.G grades sit below those, trading some precision for a lower price on machines that don't need the extra capability. We first covered SEW-EURODRIVE on 12 August 2026.
What actually changes between the three new grades?
Each grade handles a different level of mechanical stress. P1.G suits standard tasks with modest side-loads. P2.G adds load capacity where stronger radial forces, meaning sideways pushes on the shaft, come into play. P3.G uses straight-cut gears and heavier-duty bearings for the most demanding jobs in the economy bracket, keeping costs within tighter budgets.
All three come in five sizes, one-stage or two-stage configurations, and rotational clearance (the tiny gear play, measured in arcminutes) of 6 to 12 arcminutes. Food-grade lubrication is available for food and beverage builders.
| Grade | Key strength | Typical use |
|---|---|---|
| P1.G | Low side-loads | Standard assembly, light packaging |
| P2.G | Higher radial forces | Material handling, gantry axes |
| P3.G | Straight gearing + heavy bearings | Machine tool portals, carton erectors |
| P5-7.G (existing) | Full precision range | High-accuracy servo applications |
Why does this matter for machine builders?
Over-specifying a part costs money on every unit produced. Servo product manager Anecia Hoffield, speaking to The Robot Report, put it plainly: "Every automation application has different performance requirements. The PxG economy series gives machine builders more flexibility to select the performance their machines actually need."
Staying inside the same PxG modular platform means a design engineer can switch between economy and precision grades without redesigning mounting or shaft interfaces. The units integrate with SEW-Workbench, DriveCAD and DriveConfigurator, so sizing becomes a software task rather than a manual calculation.
What does this mean for ordinary factory operators?
If your plant buys packaging or assembly machines, the effect arrives quietly through the next machine your supplier quotes. Builders who use these units can price mid-range automation competitively without cutting service life short: SEW-EURODRIVE rates the economy series at more than 20,000 hours, enough for several years of continuous use across most shift patterns.
For context on how component choices ripple through robot design, our 28 July story "The Tiny Motors Powering Humanoid Robots to Walk, Reach, and Balance" traced exactly that calculation in a different product category. The pattern holds here too: specifying down, not just up, is where real engineering discipline shows.
