Re: [CAD_CAM_EDM_DRO] RE:Re: Re: no thrust bearing - simple design ?

At 10:17 AM 4/20/03 -0700, you wrote:

>A long thin screw behave somewhat like a string on a musical instrument. It
>is made stiffer by tension.

Actually, no. The material characteristics aren't affected at all by
preload. IOW, deflection of a member under an increment of load is always
the same throughout the elastic range, no matter what preload is applied.

>'m almost certain that the whipping modes
>would move to a higher speed if the screw was tensioned.

That may be true but it isn't the same thing.

>On the subject of bearings, does anyone know how fast plain bearings can be
>run?

The catalogs always give a load reating at a given max RPM.

Regards, Hoyt McKagen


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