Re: [CAD_CAM_EDM_DRO] Re: Lost steps

True but the cost of precision is comming down. Precision has two components, accuracy and repeatability. Machines in general
are becomming more repeatable (if not more accurate) and these machines are used to build other machines thus improving the overall
precision of what is available. The bell curve is getting narrower. Six sigma and all that.
Peace

Terry Ackland wrote:

> ---Ron,
> I have mill drill in my basement and the lead screw is all over the
> place. If I need to do anything fussy I have to set up an indicator
> because I cannot trust the dials.
> I can remember many years back working on a new Bridgeport with
> digital readout and expecting it to perform like a jig borer. The
> first job sorted that notion out!
> You have to pay for precision and you cannot really expect it from
> what most of us hobbyist are prepared to shell out for.
> Terry
>
> In CAD_CAM_EDM_DRO@egroups.com, Ron Ginger <ginger@s...> wrote:
> > Ozzie@h... wrote:
> > >
> > > In repeated attempts to determine the backlash on the axis, I
> find
> no
> > > consistency in dial indicater readings. On the X axis I lose
> > > .002-.003" cumalatively in one direction. On the Y axis the
> readings
> > > are erratic with variations in the.002" area.
> >
> > Everyone else seems to be looking for electrical causes, Id look for
> > plain old mechanical ones. And this is exactly why I do not think
> > software compensation for backlash is worth it. You are finding its
> > almost impossible to accurately measure the amount, so how can the
> > software accurately compensate?
> >
> > Variations can come from wear in the screws, variation in friction
> from
> > move to move- chips in the way, etc. Try making the moves under as
> > constant a load as possible- like while cutting a slot in some
> stock.
> >
> > The only solution to backlash is elimination! Ballscrews or Moglice.
> >
> > ron
>
>
>
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