Helical Gear Manufacturing UK

Helical gears use angled teeth to give progressive engagement and increased contact ratio compared with equivalent spur gearing. Ondrives manufactures and supplies precision helical gears for standard and bespoke drive requirements.

Helical gear geometry

Important parameters include normal module m_n (or clearly stated transverse module m_t), tooth count z, normal pressure angle α_n, helix angle β, helix hand (for example +20° RH or −20° LH), profile shift x, face width b and datums. The mating gear and operating centre distance a should also be identified.

Cutting and grinding

Ondrives' manufacturing capability includes gear cutting and high-accuracy gear grinding. The route is selected to suit material condition, required gear quality, flank finish and any specified tooth modifications.

Lead and profile control

Helical gearing is sensitive to lead geometry and alignment. Where required, profile or lead modification can be included in the manufacturing plan and verified by analytical inspection.

What to provide

Send the drawing/model plus mating-gear data, operating centre distance, required quality grade, material, heat treatment and any profile/lead modification requirements.

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.

Helical geometry, thrust and contact

Helical teeth provide overlap and smooth engagement, but the helix introduces axial force and additional geometry conventions that must be controlled on the drawing.

Normal and transverse systems

Normal module m_n is in the plane normal to the tooth trace; transverse module m_t is in the plane perpendicular to the axis. The drawing should state the reference system. Axial module m_x, axial pitch p_x / lead p_z and complementary lead angle λ are explained on hover.

Helix angle β and axial thrust

Helix angle β is measured between the tooth trace and gear axis on the reference cylinder. It generates an axial component of tooth load. Bearings, shaft shoulders and housing stiffness must suit the direction and magnitude of thrust in normal and reversing operation.

Face load distribution

Lead crowning or end relief may be used where shaft, bearing or housing deflection would otherwise concentrate load at an edge. Modifications should be application-led and inspectable.

Specify helix angle β and hand, normal module m_n or other clearly stated reference-plane geometry, face width b, centre distance a or mating-gear data, backlash, material, heat treatment and gear quality. For a replacement pair, include the mating component information rather than assuming any same-module helical gear will mesh.