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BS 978-2:ADDENDUM NO. 1:1959 Gears for instruments and clockwork mechanisms. Cycloidal type gears. Double circular arc type gears
standard by BSI Group, 05/15/1959
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Basic rack tooth shape and modules from 0.150 mm to 0.700 mm inclusive. Limits of tolerance for tip diameter, pitch, tooth thickness, profile, axial and radial run-out and centre distance; cutters for pinions with from six to twelve teeth.Cross References:
BS 978:Part 2
BS 2519