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This Document Has Been Superseded
A newer publication replaces it: BSI BS 5221
Specification for gear hobs -- Hobs for gears for turbine reduction and similar drives
Part 2 of this British Standard applies to Grade AA ground profile single-start right-hand and left-hand finishing hobs for gears for marine turbine, land turbine and similar drives.
It covers the accuracy requirements of hobs for the production of gears complying with BS 1807, “Gears for turbines and similar drives?”, Part 1, “Accuracy?” and recommends basic dimensions for hobs with the tooth forms and pitches given in BS 1807-2, “Tooth forms and pitches?”.
Permissible errors of grade AA hobs for cutting gears 3 to 14 d.p. and 0.2 to 1 inch axial pitch.
Basic dimensions for hobs, hob arbor, keyways.
Marking, ordering.
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