I am surprised about this. I am working as a meteorology application
engineer about 20 Years now, mostly in metal working industry.
It might be possible to guide a machine with accuracy of 1 µm, but how
will you check that accuracy.
You may take a laser interferometer and you will get a result, but is
that one correct? And that is only one dimension!
But accuracy and repeatability mus be holded under all working
circumstances to get process reliability. That would require temperature
controlled room, machine and cooling. At my company we do calibrate
about 3500 measurement tools every day approved according German rools
(DAkkS).
We are not allowed to switch of the light, not even between Christmas
and NewYear, as that would result in accuracy loss of our flatness normals.
So IMHO I do have a little knowledge about accuracy.
I think we are talking about different stuff, positioning a machine at
that accuracy might well be possible, but holding an accuracy with a cg
and cgk Factor of 1.33 for the hole operating area of the machine and
hole the year is another part of the work.
In optics work, the dimension is less important than the contour of the
peace, In that industry I sell WhiteLight microscops to control form of
lens and roughness. But that is another problem.
Regards Norbert
Am 04.07.2017 um 18:54 schrieb Eric Keller:
On Tue, Jul 4, 2017 at 12:01 PM, Niemand Sonst <[email protected]> wrote:
But if you speak about 0.1 µm it is useless to build a lathe on that
accuracy, as you will never be able to turn a part at that accuracy. Just a
few degrees temperature difference will destroy the repeatability.
The people that work on optics would be really surprised to hear this, also
diamond turning work is done at much finer levels than 100 nM. Sure,
thermal growth is an issue. People really want to do work down in the 1nM
range because that's what their requirements are.
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