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Duplex Worm Gear

Duplex Worm Gear

Custom production according to customer request Diameter from 15 to 300 mm, axial distances from 17 to 210 mm, module from 0.5 to 10, shaft length up to 500 mm Material selection according to customer requirements (steel, bronze, fabric laminate or plastic) All process steps (turning, hobbing,...

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  • Product Details
  • Custom production according to customer request

  • Diameter from 15 to 300 mm, axial distances from 17 to 210 mm, module from 0.5 to 10, shaft length up to 500 mm

  • Material selection according to customer requirements (steel, bronze, fabric laminate or plastic)

  • All process steps (turning, hobbing, annealing, flank grinding, grinding, measuring) from a single source


Diameter from 15 to 300 mm, axial distances from 17 to 210 mm, module from 0.5 to 10, shaft length up to 500 mm Material selection according to customer requirements (steel, bronze, fabric laminate or plastic) All process steps (turning, hobbing, annealing, flank grinding, grinding, measuring) from a single source


The gear variety designed as a duplex worm gear set is especially suited for drives that require positioning at precise angles with high gear ratios. A plus factor is that the gearing backlash can be adjusted repeatedly. If after a longer period of operation the circumferential backlash increases, the gearing can be readjusted so that it is low backlash. For this purpose, the worm shaft is shifted axially in the gear housing by small increments. This is done, for instance, using shim rings when installing the fixed bearing or by means of adjusting screws in the housing cover. The duplex gearing is distinguished by tooth flanks with different helix angles. Axial adjustment of the worm shaft results in low backlash engagement of the worm tooth pitch with the teeth of the worm gear. Worm gear sets by Framo Morat that can be adjusted for low backlash are available from module 0.3 through module 8.


Duplex gearing is used, for instance, in rotary and swivel tables that position components for processing or for automated assembly. In addition, low backlash worm gearing sets optimize optical and mechanical instruments in measurement and medical technology. Because the gearings are adjustable, instruments, components to be measured and optics can be precisely positioned throughout their entire service life.

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