Re: [CAD_CAM_EDM_DRO] Re: Ball screws for CNC plasma cutters

Sven,
It looks as tho you have something very useful here, but I am having great difficulty
visualizing what you describe.
Could you upload a drawing or sketch to the group's "Files" on Yahoo?
Regards, Rich D.

"Sven Peter, TAD S.A." wrote:

>
> Hey Smoke,
> there is a much better way to get rid of back lash.
> What you propose always will have the back lash as soon you force the nut.
> I apply frequently the self adjusting system my italian lathe has. (Last time adjusted 4 years ago:
> back lash in the beginning 0,01mm, now 0,04mm on radius)
> Ok: where you screw normally the nut to the cross way, you put an accurate cylinder with
> slots were the screw passes through.
> The acme nut you make has to be sloppy on the screw and has to have the groove tip narrower than normal. The out side form is
> cylindrical and has to fit perfectly in this cylinder.
> Out side of the thread from the top you make 2 or 4 threads passing through, drill open until the height of the thread and counter
> bore the diameter of the head of the allan screws nearly to the depth of the drilled part ( about 4 or 5 mm less). Until now you
> part the nut horizontally on the center line of the thread with a saw type slot mill (width 2,5 to 3,5mm depending on the size of
> the scew). Don't forget a oil hole.
> The nut you assemble with springs below the allan screw heads. After playing a little you find out what is the right spring pressure
> and all backlash that will be left is the play between the nut outside and the capture cylinder. The nut moves smooth and will
> collapse on the worn parts of the screw.
>
> Of cause you are able to use the same system on a normal screw. And this is not invented it is working really good.
>
> Good luck
> Sven Peter
>
> Smoke wrote:

SNIP>>>>