British Standards Institution

Source:: ISO
Committee:: MCE/5 - Gears and shafts for machinery and accessories
Categories:: Gears
Comment period start date:: 21/03/2025
Comment period end date:: 14/05/2025
Number of comments:: 0

Comment by:

14th May

Scope

This document specifies formulae for calculating the load capacity of cylindrical worm gears and covers load ratings associated with wear, pitting, worm deflection, tooth breakage and temperature. Scuffing and other failure modes are not covered by this document.

NOTE The load rating and design procedures are only valid for tooth surface sliding velocities, , less than or equal to 25 m/s and contact ratios greater than 2,1.

NOTE For wear, load rating and design procedures are only valid for tooth surface sliding velocities which are above 0,1 m/s.

NOTE The rules and recommendations for the dimensioning, lubricants or materials selected by this document only apply to centre distances of 50 mm and larger. For centre distances below 50 mm, method A applies.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal (Complete)

Proposal start date:

2. Draft (Complete)

Draft start date:

09/01/2025

3. Public Comments

Public Comments start date:

21/03/2025

Public Comments end date:

14/05/2025

Learn more about the standards development process

Standards Development

BS ISO 14521 ISO 14521 Gears. Calculation of load capacity of worm gears

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