Re: [CAD_CAM_EDM_DRO] Does this make sense? wasRe:BentNookballscrews ?????

Carlos Guillermo wrote:

>Kim -
>
>Just to clear this up -
>
>The coefficient I used of 0.2 is not the efficiency. It is a
>coefficient that takes into account lead angle, pitch circle
>diameter, friction angle, and friction coefficient. The range
>they give for the friction coefficient is from 0.003 to 0.010.
>
>
>

But, the following nut is applying a force that is HELPING the screw
to turn, thereby cancelling out 90+% of the drag applied by the advancing
nut! This is why the force to turn the screw is so much less than it would
be if the advancing nut had the preload force applied externally.

Jon