RE: [CAD_CAM_EDM_DRO] Bent Nook ballscrews ?????

A substantial amount of force would have to be greater than the pushing
capacity of the motor so that there was never a force that would
displace the nuts against each other. If the spring is weaker than the
pushing force of the motor, then it will displace the backlash under a
heavy cut.

As soon as the nuts are adjusted for the maximum force the motor is
capable of moving, there isn't any force left to move the cutter.

Kim

On Mon, 2003-08-11 at 12:05, Carlos Guillermo wrote:
> Kim -
>
> IIRC, many commercial preloaded ballnuts use disk springs
> (Belleville washers, wave washers, etc) between the nuts. They
> are usually very stiff springs, which apply a substantial
> percentage of the ballnut's capacity, and it is not too difficult
> to select a preload force that will be higher than the expected
> axial loads on the ballscrew.
>
> Regards,
>
> Carlos Guillermo
> VERVE Engineering & Design
>
> -----Original Message-----
> From: Kim Lux [mailto:lux@...]
> Sent: Monday, August 11, 2003 10:42 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Bent Nook ballscrews ?????
>
>
> Spring compliant nuts are a total NO NO. With the forces involved
> with
> a ball screw setup, they do NOT keep the ball nuts preloaded.
>
>
>
>
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