Re: [CAD_CAM_EDM_DRO] Re: Linear rail & ball screw size suggestions

----- Original Message -----
From: "dave_ace_me" <davemucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, April 10, 2002 7:05 PM
Subject: [CAD_CAM_EDM_DRO] Re: Linear rail & ball screw size suggestions


> This is for all-thread.
>
> If you use a 1 inch screw 8 TPI and a 1 inch long nut, you only have
> 8 engaged threads. The nut will have a noticeable wobble.
>
> if your nut was 6 inches long, it would have 48 threads and all the
> normal mechanical missalignent would equal itself out to a great
> degree.
>
> Put a standard nut on a screw, then a long coupling nut. the long
> nut has much less movement, a longer nut will have even less.
>
> Dave
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "J.Critchfield" <js3mc@a...> wrote:
> > Dave,
> >
> > You make a good point about sizing for a larger router. I had this
> in mind
> > but I am hoping the smaller unit will work. I will make an
> allowance for it.
> >
> > My preliminary estimate is the overall size of the machine will be
> in the
> > neighborhood of 24" x 18" allowing for the router. mount and linear
> > components. The Data-cut machine that I have plans for uses the
> shaft and
> > rail systems and I was going to scale down much of that design. I
> have 176oz
> > Powermax motors to use.
> >
> > > It seems that 6 times more
> > > thread than the diameter of the screw offer good results.
> >
> > Sorry I don't follow this statement. What do you mean by 6 times
> more thread
> > than dia?
> >
> > Thanks,
> >
> > Jay
>
>
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