Re: [CAD_CAM_EDM_DRO] Was: Linear rail, accuracy in general

yes tool wear has a great efect on the part tolerances ,BUT (here it comes..)
many machines can factor it in by measuring the spindle load
over time and swapping tools if the load runs some percentage over the
baseline setting for that tool
some can even measure vibrations and correct for chatter by tweaking the
feeds and speeds

others use a CMM type probe to measure the part and adjust the tool
offset to bring the part back into spec

and there are several types of broken tool detection systems

it just depends on how much setup time and money you want to spend :-)

Brian

On Friday 12 April 2002 19:43, you 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.