Worm and Wormwheel Manufacturing UK

Worm gearing combines a screw-like worm with a mating wormwheel to create a compact right-angle transmission. Ondrives manufactures and supplies worms, wormwheels and precision worm-drive components for standard and bespoke applications.

Worm gear geometry

Important variables include the stated module reference system, including axial module m_x where applicable, worm starts z₁, wheel teeth z₂, normal pressure angle α_n, worm lead angle γ, centre distance a, material pairing and backlash.

Sliding contact and material choice

Worm drives contain significant sliding, so material pairing, finish, lubrication, temperature and duty cycle are important to performance. Ratio alone is not enough to define a suitable design.

Manufacturing the pair

The worm and wheel need compatible geometry and controlled centre distance. Blank datums, bore or shaft features and final inspection should therefore be planned as part of the complete pair.

Selecting a worm transmission

Review torque, speed, duty cycle, backlash, efficiency, temperature, lubrication and mounting conditions. For an existing application, also provide the original centre distance and mating-part data.

Need help with a specific gear? Send Ondrives the drawing, model or available gear data. For new designs, include the operating duty and mating-component information so the manufacturing route can be reviewed in context.

Worm transmission engineering considerations

Worm gearing combines a screw-like worm with a worm wheel and usually involves substantial sliding contact. Ratio alone is therefore not enough to select or reproduce a working transmission.

Starts, ratio and lead angle γ

Worm starts z₁ and wheel teeth z₂ determine nominal ratio. Worm lead angle γ is referenced from a plane normal to the worm axis. With an axial module system, p_x = πm_x and lead L = z₁p_x. This is not the same reference convention as cylindrical-gear helix angle β.

Material and lubrication

Material pairing, hardness, surface texture R_a / R_z, lubricant, speed and thermal conditions influence wear and efficiency because worm contact contains significant sliding.

Back-driving and safety

Do not treat a worm gearbox as a guaranteed brake or safety holding device. Back-driving behaviour varies with geometry, lubrication, wear, vibration and load and must be assessed for the specific application.

For a worm/wheel manufacturing enquiry include centre distance a, ratio or starts/tooth count, the stated module system (for example axial module m_x where applicable), normal pressure angle α_n/tooth form, worm lead angle γ, hands, face dimensions, material pair, duty, speed, torque and lubrication assumptions.