Gear Design and Engineering Support UK

A manufacturable gear design connects geometry, strength, accuracy, material, heat treatment, bearing support and inspection. Ondrives supports build-to-print manufacture and engineering review for new or developing gear requirements.

Information needed at the start

Useful inputs include power or torque, speed, ratio, shaft arrangement, duty cycle, expected life, available space, environment, backlash requirement, noise constraints and material restrictions.

Geometry is interconnected

Module m, tooth count z, pressure angle α, helix angle β, profile shift x, face width b and centre distance a interact. For helical gears, state whether geometry is normal or transverse.

Design for manufacture

Tool access, heat-treatment movement, grinding allowance, datum strategy and inspection access can influence the preferred component layout and tooth geometry.

Use GearCALC and SplineCALC

Ondrives' engineering tools can help review geometry and terminology during development. They are intended to support engineering work alongside the drawing, applicable standards and final design verification.

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.

Core geometry relationships to define early

Gear geometry is a system. Module m, tooth count z, pressure angle α, helix angle β, profile shift coefficient x, centre distance a, backlash and face width b interact, so changing one value can alter several operating dimensions.

Module, tooth count and ratio

Module defines basic tooth size and tooth counts z₁/z₂ set nominal ratio. For helical gears, distinguish normal module m_n from transverse module m_t; their relationship depends on helix angle β. Axial module m_x is a derived axial-system quantity when required.

Profile shift and undercut

Profile shift/addendum modification can help manage low tooth counts, tooth thickness and centre distance. It must be designed as part of the mesh, not applied independently to one gear without checking the mate.

Backlash and contact ratio

Backlash provides operating clearance and contact ratio indicates the average number of tooth pairs sharing contact. Both influence smoothness, tolerance sensitivity and application behaviour.

For design review provide speeds, continuous and peak torque, ratio, shaft arrangement, centre distance constraints, duty cycle, reversals, backlash/positioning targets, materials, environment and required life. GearCALC can support geometry exploration; application rating and final design require the appropriate standards and engineering review.