Worm Gear MFG – Double-Enveloping Worm Gear Guide

Worm Gear MFG (wormgearmfg.com) explains double-enveloping, or hourglass, worm gears: the worm curves partly around a throated wheel so three to seven teeth share the load instead of the one to two of a cylindrical design. The guide covers the geometry, the multi-axis CNC grinding the globoid profile needs, the resulting load capacity and self-locking behaviour, and where the extra cost of a double-enveloping set is justified.