If you look at semiconductor fabs where that make parts with features sizes as small as 10 nM now they seem to never bolt equipment to the floor. No matter how strong your machine is, bolts will distort the frame. They take strong measures to isolate the machines from the building.
Of course no one here worries about nanometers, but still those ideas posted here about bolting a milling machine column to a wall are exactly backwards. I our case where the machines are small, well under 1,000 pounds I think the best idea is rubber isolation pads. You can make these by cutting rubber washers. You want mounting design the stops the machine from moving around but still allows a few hundreds of an inch of movements relative to the support. But it is pretty each to over think this, bolts left 1/4 turn from full tight and the use of a rubber or fiber washer in the stack is more then enough. Any solution costing over about $5 is likely so complex. On Sat, Oct 7, 2017 at 9:30 AM, dave <dengv...@charter.net> wrote: > Rather a cute idea. :-) > So taking it a step further ... use a double column of CMU for the > headstock and a single column to support the tailstock. > Epoxy the CMU to make a good column but don't epoxy to the floor. Use a > rod end or automotive ball and socket to relieve stress on the > tailstock. > > Dave > > I have to be very careful or I learn something every day. > > > On 10/04/2017 08:28 PM, John Bald wrote: > >> It does seem a lot simpler now...assuming I understand the whole idea. So >> the only difference in the stand itself is the single contact point on the >> tailstock end? There is nothing different on the headstock end then, >> correct? >> >> I like your idea about using the Chevy truck upper ball joint in my >> design Gene. Found a new on one eBay for about $10 . Do you think 24" depth >> will be stable enough or should it be deeper? Not planning to bolt it to >> the floor >> >> Sent with AquaMail for Android >> http://www.aqua-mail.com >> >> >> On October 4, 2017 10:37:11 AM Gene Heskett <ghesk...@shentel.net> wrote: >> >> On Wednesday 04 October 2017 05:43:19 andy pugh wrote: >>> >>> On 4 October 2017 at 02:32, John Bald <robotwiz...@att.net> wrote: >>>> > Has anyone built or familiar with the "spanning beam" or "torsional" >>>> > beam lathe stand? >>>> >>>> It seems to be giving a fancy name to a simple idea. >>>> >>>> I would imagine that a single pin joint at the tailstock end would >>>> isolate the machine from the floor even better. >>>> >>> >>> I'll second that thought Andy. My nearly 70 yo Sheldon has a spring >>> loaded ball and socket joint the right end of the bed sits on. So the >>> right bed foot can be off several degrees from level w/o effecting any >>> twist in the bed. If thats a problem, I see zero reason a chevy light >>> truck ball joint couldn't be fitted to carry the load, and isolate >>> things from a poorly poured floor. I put 2 of them out in the weather 25 >>> years ago as the pivot points for an az-el satellite dish mount I made >>> with motors and a 2 axis controller. The only mistake I made was >>> inadequate weather protection for the azimuth drive jack, which lays >>> horizontal, its filled itself with rainwater, which in turn has frozen >>> and destroyed it several times. The first k band dish we had, its still >>> a 1/4 m.o.a. rifle barrel, way better that a $180k 7 meter dish from >>> scientific-atlanta. >>> >>> Cheers, Gene Heskett >>> -- >>> "There are four boxes to be used in defense of liberty: >>> soap, ballot, jury, and ammo. Please use in that order." >>> -Ed Howdershelt (Author) >>> Genes Web page <http://geneslinuxbox.net:6309/gene> >>> >>> ------------------------------------------------------------------------------ >>> >>> 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 >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >> >> >> >> ------------------------------------------------------------------------------ >> >> 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 >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > ------------------------------------------------------------ > ------------------ > 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 > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
