Sustainability has evolved from a marketing buzzword to a hard economic factor. The energy efficiency of production not only influences operating costs but also the evaluation by clients within the scope of supply chain audits. A crucial technological lever here is the choice of drive concept in the rotary table.
pL LEHMANN favours the PGD (Preloaded Gear Drive) gearbox for many applications, as it offers significant energy-saving benefits compared to direct-drive systems. A direct drive requires a constant power supply to maintain its position, thereby generating heat that often has to be dissipated via a complex, energy-intensive water-cooling system. The PGD gearbox, on the other hand, utilises a high mechanical gear ratio with 100% self-locking, allowing for the use of significantly smaller servo motors that consume less power. Furthermore, the gearbox requires no cooling, which further reduces the complexity and energy requirements of the overall system.
| Parameter | PGD gearbox (500 series) | Direct drive (Series 900 DD) |
|---|---|---|
| Electricity consumption | Very low | Higher (holding current, acceleration) |
| Cooling required | None | Partially (high speeds, high duty cycle, thermal stability) |
| Torque | Very high, thanks to mechanical translation | Massively small in proportion to the construction size |
| Main Operation | Precise positioning and simultaneous machining at low speed and duty cycle | highly dynamic simultaneous milling, as well as turning and grinding |
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