= Elements of Metric Gear Technology by SDP-SI
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https://sdp-si.com/resources/elements-of-metric-gear-technology/page2.php
Manufacturer technical reference, §3.1, definition of pressure angle as the angle between the line of action and a perpendicular to the line of centers. The line of action is the common tangent to the base circles. The corresponding current manufacturer page is https://shop.sdp-si.com/products/gears-differentials-pinions-racks/spur-gear-technical-information.html .
https://sdp-si.com/D805/D805_PDFS/sections/technical.pdf[Elements of Metric Gear Technology], §7.3, equation(7–8), printed T-60: helical-gear axial thrust equals transmitted tangential load times the tangent of helix angle. Figure7-1 relates thrust direction to gear hand and rotation.
https://sdp-si.com/D815/D815-Technical-Section.pdf[D815 technical section], §11, Table11-3, “Axial (Overlap) Contact Ratio”, printed T-111: helical overlap ratio is face width times sine of helix angle divided by normal circular pitch. This indexed manufacturer edition carries copyright2019.
https://www.sdp-si.com/D815/D815-Technical-Section.pdf[D815 technical section], §17.2.12, printed T-164, and Table 17-11: tooth-flank load distribution depends on face-width-to-diameter ratio, shaft bearing arrangement and shaft stiffness. The manufacturer distinguishes an uncertain loaded-contact case from one whose contact is predictable.
https://www.sdp-si.com/D815/D815-Technical-Section.pdf[D815 technical section], Section 19 and §19.1, printed T-221: tooth-surface contact, assembly alignment and interpretation of surface contact for spur and helical meshes.
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