Some of the most precise machines in the world are those used to make semiconductor IC chips.
What they've figured out years ago was that clamping stuff down is not good. In a big plant they might have a thick concrete floor that is floating on bags that are filled with air. This isolates the factory floor from the movement of the earth under it. Same at other levels, bolting a stand to the ground is only going to bend it. Better to secure it with rubber pads on the floor and under the washers to allow for relative movement. The only thing that you really should bolt an iron machine to is a big chunk of iron and even then when the base and tool have the same thermal expansion this only works if the temperature is not changing. The machines they use are kept under strict temperature control. Lucky for us we don't make ICs and don't work in nanometers and none of this really maters. But even if it don't matter rubber pads and easy to do. On Sun, Sep 17, 2017 at 11:32 AM, Marcus Bowman <[email protected]> wrote: > > On 17 Sep 2017, at 18:09, John Bald wrote: > >> And in this case should dampening material be placed between machine and >> stand instead of under levelers? > > I would put thin dampening material under the feet between foot and floor. I > have used thin butyl rubber (pond liner) because it is not terribly > compressible, and will take a significant load. Expensive material, but not > if you have some offcuts from creating a pond... > > Marcus > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
