Re: Was: Linear rail, accuracy in general

Hi John,

when cutting threads manually on a lathe. ok bad way of saying that,
but when you do cut them you get your thread to size, then take 2
more passes with the same tool depth.

that will just smooth the surface and take off any high spots.
I think that is close to polishing, really just taking out any tool
marks.

Dave

--- In CAD_CAM_EDM_DRO@y..., "John H." <johnhe-uk@s...> wrote:
> > is called "adaptive" machining, which is a huge buzzword in the
> > metalworking industry lately... It means what it says, the machine
> > has the ability to adapt to variations measured, and make
corrections.
>
> ///Not long until the machine revolt now. It'll be like short
circuit all
> over again.
>
> > As someone else mentioned, this is now done with very precise
probes
> > and lasers,etc.. Someone else mentioned that before this "in
process
> > inspection/probing" (another buzz term), tool offsets were updated
> > every so many parts, or hours... This is an older process, and
can be
> > seen in even older G code, which has/uses G44-48 for increases to
the
> > tool offset(s).
>
> ///I read that the final stages are polishing, not milling, to get
it down
> to the last few 'cents. Does it mean polishing with a metal tool,
not the
> kind of polishing you think of when you do your car? When you
program a
> machine like a spanking new Haas that has a big tool changing on it
does the
> person doing the drawing have to tell the machines when to change
tools or
> can they work it out for themselves from details about the tool?
Also who
> makes these micron (Metric micron) level machines?
>
> Thanks,
> John H.