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BSI BS 721-1:1963

Specification for worm gearing -- Imperial units
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BSI BS 721-1:1963

Specification for worm gearing -- Imperial units

PUBLISH DATE 1963
PAGES 36
BSI BS 721-1:1963

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.
SDO BSI: British Standards Institution
Document Number 721-1
Publication Date April 25, 1963
Language en - English
Page Count 36
Revision Level
Supercedes
Committee MCE/5
Publish Date Document Id Type View
April 25, 1963 BS 721-1:1963 Revision