Low Backlash Positioning and Drive Units are based on the Duplex worm gear principle. The two worm and worm gear each have a different lead.

Through axial displacement of the worm, the backlash can be adjusted to a minimum. The flank contact will not be impaired and additional backlash adjustments are always possible without disassembling the gearbox.
The worms are of a special steel, which is hardened and ground. The worm gears are made from spheroidal graphite casting nitrated.

Worm and wormwheel are manufactured to DIN 3975/76.
The casings are fully machined and with its many fixing bores and tapped holes allowing mounting in any position.
The synthetic special oil for lubrication ensures a high degree of efficiency and smooth operation.
A special clutch on the input and a discplate coupling on the output shaft guarantee largely torsion and backlash free connections and mounting of any type of motor.