Worm or Helical Gearbox: Which One Actually Fits Your Machine?
Plant engineers ask this question more often than almost any other: should the drive be worm or helical? There isn't a single correct answer, because the two designs solve different problems. A worm gearbox works through a screw-shaped worm meshing with a wheel at a right angle. That sliding contact allows a very high reduction ratio inside a small housing, and it lets the unit hold a load in place even when the motor is switched off. The trade-off is friction — a worm unit converts more input energy into heat than a helical one does. A helical gearbox uses angled teeth that roll into mesh rather than slide. That rolling contact is far more efficient and runs cooler, but it comes with a larger footprint per reduction stage, and it cannot lock a load on its own. So the decision really comes down to how the machine is used, not which gearbox is "better." A right-angle drive on an intermittent packaging line, a hoist that must hold a suspended load, or any application ...