[TowerTalk] Worm Gears

[Howard Hoyt]

Bob, K6UJ wrote:
> Hub City recomends a PAG synthetic

PolyAlkyline Glycol lubricants are part of the new API Group V Synthetic 
lubricants and have unique characteristics lending themselves to gear 
oils.  In general they have very high shear friction, associated with 
strong cohesive forces in the oil film. This makes them god 
high-pressure lubricants when formulated for this use.  In general they 
are less well suited to high shear-rate applications like high 
surface-speed plain bearings.

The newest Oil-Soluble PAGs (abbreviated OSP) can be highly polar and as 
such show good affinity to metallic surfaces.  Some have extremely high 
viscosity indices approaching 200.  This means they will show good 
performance over a wide range of temperatures.  I have no personal 
experience with these lubricants, but if Hub City recommends their use, 
it would be counter-productive to use anything else.

Cheers & 73,

Howie - WA4PSC