= KHK Gear Nomenclature
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Manufacturer documentation by KHK: https://khkgears.net/new/gear_knowledge/gear-nomenclature/intermeshing-pitch-circle.html[Intermeshing Pitch Circle], definition and the names operating pitch circle and working pitch circle.
https://khkgears.net/new/images/qanda/pitch.pdf[The ABCs of Gears, A: The Introductory Course], §7, printed p. 18: diagram distinguishing reference, tip, base and root circles. https://khkgears.net/new/gear_knowledge/gear_technical_reference/basic_gear_terminology_calculation.html[Basic Gear Terminology and Calculation], reference diameter and module; https://khkgears.net/new/gear_knowledge/gear_technical_reference/calculation_gear_dimensions.html[Calculation of Gear Dimensions], §4.1, operating pitch circles for meshing profile-shifted spur gears.
https://khkgears.us/media/fqrlut1m/abcs-of-gearing-b.pdf[The ABC's of Gears, Basic Guide B]. Manufacturer-authored guide: §1.1, printed pp.4–5, speed ratios and compound gear trains, equations(1.1)–(1.2); §2, printed pp.12–19, module, reference pitch and reference/tip/root diameters, equations(2.1), (2.8)–(2.10), Figure2.6 and Table2.1; §3, printed pp.20–21, involute construction, base/reference circles and equation(3.1). The PDF contains facing printed pages; printed p.15 is PDF page8 and printed pp.20–21 are PDF page11.
https://khkgears.net/new/gear_knowledge/gear-nomenclature/length-of-path-of-contact.html[Length of Path of Contact]: usable contact is the active segment of the involute line of action, and contact ratio is its length divided by base pitch. Basic Guide B §2, printed p.19, equations(2.13)–(2.14), distinguishes normal and transverse helical-gear modules.
https://khkgears.net/new/gear_knowledge/gear_technical_reference/calculation_gear_dimensions.html[Calculation of Gear Dimensions], §4.3, Figure4.7 and equations(4.13)–(4.14): developed reference-cylinder diagram distinguishes normal pitch, transverse pitch, axial pitch and one-turn lead. The corresponding KHK Technical Reference printed page is614.
https://www.khkgears.us/catalog?cid=ground_spur_gears_ssg_r[SSG-R ground spur gear catalog]: separate columns and dimensional symbols for face width E, hub width F and total length G.
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