Re: Was: Linear rail, accuracy in general

John,

You've already gotten some good answers so you now know that many CNC
machines DO compensate for wear of the tooling. This is part of what
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.

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).

Hope this helps,

Ballendo

P.S. Immersing the machine in coolant is not necessary to make
accurate parts. Doing so will add to the cost of both machine
AND "consumables"/ maintennance IMO. Without real benefits, compared
to what is already achieved with current techniques.

--- In CAD_CAM_EDM_DRO@y..., "John H." <johnhe-uk@s...> wrote:
> Hi,
>
> I noticed on this thread someone mentioned big high precision
machining
> centres that have thermal management etc to keep them at real close
> tolerances at great precision. I remember seeing the working and
result for
> how much a lump of steel extends for such and such a temperature
rise and
> seeing how great it's effect was at these levels. But doesn't the
wear on
> the machine's tooling contribute even more to inaccuracies? I mean
the wear
> on a tool over tens of hours machining must be more than a few
microns
> easily. Yay or nay? Please don't tell me the machine can factor in
for tool
> wear? : )
>
> Thanks,
> John H.