AGMA 6022-C93 Design Manual for Cylindrical Wormgearing by agma

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3 point Wormgear of the mesh. (Eq 34M) W, where Wtg is the wormgear tangential force, lbs (N); TG is the wormgear torque, lb-in (Nm): W ,, is the worm thrust force, lbs(N); D m is the wormgear mean diameter, in (mm). and D m = 2C-dm where C is the center distance, in (mm); dm is the worm mean diameter, in (mm). (Eq 36M) = ww where W,, is the wormgear thrust force, lbs (N): W, is the worm tangential force, lbs(N); Tw is the worm torque, lb-in (Nm); dm is the worm mean diameter, in (mm). (Eq 38) - Figure 26 Worm and wormgear forces RH thread 27 COPYRIGHT American Gear Manufacturers Association, Inc.

2 Boundary lubrication service life after run-in. 1 Phosphor bronze pressures are lower, boundary or mixed lubrication a or very thin hydrodynamic If significant amountsof power are involved, a phos-may exist where partial phor or tin bronze is usually employed. This mate- film isdeveloped. 3 Full film lubrication 5% nickel which is either With higher speeds and high viscosity lubricants, a rous, and occasionally 1-1 AGMA sand, chill or centrifugally cast (see full film or hydrodynamic film of oil is developed 6034-B92).

The more oversize fedtangentiallythroughthewormgearblank to used, the more crowning of the wormgear teeth generate and 25). Very little oversizewill produce a lnfeeding or radial feeding of such a single point tool very full face contact. Theamount of oversize is a will not generatethe wormgear teeth fully so the tool compromise between initial contact requirements and hob life. must be tangentially fed. 2 Hob profile ratios must be hunting tooth in order to formall the teeth Hobs must be produced with the same profile as thewith the single point (thread) flycutter.

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