On Tue, 2012-12-11 at 13:20 -0600, [email protected] wrote: > On Tue, 11 Dec 2012, Kent A. Reed wrote: > > > On 12/11/2012 12:14 PM, ed wrote: > >> [email protected] wrote: > >>> how stable is concrete > >>> i have my small mill in a spare bedroom in a wooden enclosure > >>> this is a old house that shifts and moves > >>> nothing ever stays level > >>> my mill is mdf so quite light > >>> if i set the acceleration to fast it dances around > >>> so my question is if i build a table and a concrete top will it remain > >>> flat and stable > >>> that would be a cheap way to gain rigidity and mass > >>> > >>> richard > >>> > >> Find a place that does granite counter tops and see if they have drop > >> out from sink cutout or a left over remnant that is big enough for your > >> use. > >> > >> Ed. > >> > > Clever. I like the re-use of material that is so commonly available. I > > kept the cutout from our fake marble sink to use as a poor-man's surface > > table. > > > > In the meantime, Richard, have you tried adding mass to your current > > table using sandbags (I love ziplock bags for this kind of work!) just > > to see what happens? Have you tried to stiffen the legs and the > > table-to-leg joints? > > > > Perhaps I should back up and ask, when you say "it dances around" do you > > mean the whole table or just the superstructure that supports the router > > (or whatever), or something else? > > > > i have the mill screwed down inside the enclosure > in my ini i have MAX_ACCELERATION = 20.0 > any higher and the whole enclosure shakes and rattles > i do a lot of small engraving > my intent is to build a strong wooden table and pour a concrete slab on top > with reinforcement and tie down bolts > concrete blocks for support with a slab on top works well. We used them for analytical balance tables. They were good enough for an AE164 mettler. We did use rubber floor matting between layers but never bothered to test to see if it did any good. ;-)
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