On Wednesday 06 January 2021 18:45:11 Jon Elson wrote: > On 01/06/2021 04:30 PM, Gene Heskett wrote: > > On Wednesday 06 January 2021 06:08:23 andy pugh wrote: > >> How far out of true is it? > > > > A good mm in some of the places I have checked. But now I need to > > stay at or below .1mm over a foot of travel for this box mod. I > > could reclamp it, and survey it with my throw away renasys(sp?), but > > am trying to get enough data I don't have to do it over for each > > piece I make. > > Well, there is always hand scraping. I've never done it on > aluminum, but I'd guess it might > be very similar to cast iron. But, of course, if putting > clamps anywhere distorts it more, then > it is kind of a losing battle. > > All you need is a known-flat reference surface like a > granite surface plate, some blue dye > and a scraping tool. You can make scrapers out of large > carbide cutting inserts. While > Dy-Kem Prussian Blue dye is the best, it is very messy, so I > recommend Canode spotting dye. > That is water-soluble.
Never heard of Canode till now. Msg marked, thanks Jon 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
