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  • BSI
    BS 721-1:1963 Specification for worm gearing - Imperial units
    Edition: 1963
    $473.45
    / user per year

Description of BS 721-1:1963 1963

This British Standard applies to worm gearing and comprises cylindrical involute helicoid worms and worm wheels conjugate thereto, the dimensions of which are expressed in inches, Four classes of gears are provided which are related to function and precision. The range of modules is given in convenient steps from 0.052 to 1.

This standard does not refer to pairs of cylindrical gears connecting non-parallel axes known as crossed helical gears.



Cylindrical involute helicoid worms with a normal pressure angle of 20° in a range of axial modules from 0.052 in to 1 in. Design, formulae for calculating worm and wormwheel dimensions; four gear classes, with tolerances for pitch, profile and worm thread thickness, and five grades of backlash for assembly. Drawings show information to be given when ordering. Appendices: determination of load capacity, design calculations for typical gears, design procedure based on axial pitch of the worm, design of worms to suit standard diametral pitch cutting tools corresponding to the normal pitch of the worm.

Standard NumberBS 721-1:1963
TitleSpecification for worm gearing - Imperial units
StatusConfirmed
Publication Date1963-04-25
DescriptorsMathematical calculations, Tooth profiles, Gear drives, Basic racks, Power measurement, Worms (gears), Dimensional tolerances, Imperial system, Load capacity, Design, Designations, Thread pitch, Worm gears, Dimensions, Friction, Loading, Gear parameters, Gear pairs, Tensile strength, Wear, Gear wheels, Strength of materials, Grades (quality)
ICS21.200 Gears
CommitteeMCE/5
ISBN0 580 34579 3
PublisherBSI
Pages48

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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