Cone Drive’s double enveloping worm gear has an hourglass shape and the gear is machined with unique contours to ensure maximum contact between the components.  This added contact creates a high torque capacity, high durability worm gear.  Cone Drive's worm gear design provides you a higher load capacity, lower contact stress, and greater shock capacity.  These improved ratings offer you the flexibility to downsize the gearbox to save space or increase the motor to get more power