On 07/04/2017 11:54 AM, Eric Keller wrote:
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.
These machines work under a cascade of temperature
stabilizing fluid held to something like +/-.01 C
to prevent any temperature fluctuations. The machines
themselves have a bunch of features to improve
stability.
Jon
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