Re: Leadscrew Error

--- In CAD_CAM_EDM_DRO@y..., "edward c heil jr" <eheil@s...> wrote:

> yes i use turbocnc and ver 4 is going to have this in the future
> check out the turbocnc yahoo group its only $20 its a great program
> with threading(reads spindle encoder for rpm)
> --- In CAD_CAM_EDM_DRO@y..., C.S. Mo <cs@v...> wrote:
> > So I've been ruminating over converting my mill/drill to
> ballscrews.. As
> > has been discussed recently, there's a whole lot of quality

levels

> out
> > there... On some high end machines it is possible to map out the
> > leadscrew error - is there any way to do this with EMC or other
> > "inexpensive" software? The advantage would be that you could,
> > theoretically, use relatively inexpensive leadscrews.
> >
> > --C.S.

Most software allows to enter the pitch value used.
acuracy can be controlled by calibrating the actual values used.
commercial machine tool controllers go even further by allowing
to enter intermediate calibration setting every couple of inches.
This would be overkill for most hobby machines.

The point about expensive precision ground ballscrews is the ability
to adjust for backlash free opperation over there entire length.
A less acurate screw needs to be adjusted as of not to bind at any
point over the length of the screw, which means more backlash!

positional accuracy is just a minor benefit.