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BS721 Pt2 1983 Specification for worm gearing Metric units. This standard is current (2004) and provides information on tooth form, dimensions of gearing, tolerances for four classes of gears according to function and accuracy, calculation of load capacity and information to be given on drawings.
It presents theoretical and practical knowledge related to analysis of dynamic load of the individual drive elements containing worm gears. The monograph describes general principles of worm gear systems and methods of creation of dynamic model of worm reducer or of an entire drive.
In principle, worm and worm gear work like a pair of helical gears in crossed configuration. The worm and worm gear have helices of the same hand. The worm has a large helix angle while the worm gear has a small one (e.g., 85° versus 5°).
Worm and WormGear Design Equations and Calculator. Gears Engineering and Design. l = lead of a worm which is the distance any one thread advances in a single revolution. Lead Angles: There are Fifteen standard lead angles: 0.5, 1, 1.5, 2, 3, 4, 5, 7, 9, 11, 14, 17, 21, 25, and 30 degrees.
The cen-ter of a double enveloping worm gear is a bit more involved. It is nominal-ly located at a plane passing through the worm gear at its root diameter. If the worm gear is throated, the loca-tion of the minimum diameter of the throat will locate the nominal center of the worm gear.
Formula For Worm Gears. (Based on Diametral Pitch) NOTE: Tooth data (Addendum, Full Depth, Etc.) is same as for spur gears. G-92.
Worm gear reducers are quiet, compact, and can have large reduction ratios in a single stage. The ideal ratio range for worm gear-ing is 5: 1 to 75: 1.This is the general range for most catalog reducers. Ratios of 3: 1 to 120: I are practical and have applications that are very successful. For ratios below 3: 1. worm gearing is not a practical ...
