On Wednesday 09 May 2018 03:08:16 Gene Heskett wrote: > On Wednesday 09 May 2018 00:34:47 Jon Elson wrote: > > On 05/08/2018 10:04 PM, Gene Heskett wrote: > > > On Tuesday 08 May 2018 22:19:25 Jon Elson wrote: > > >> On 05/08/2018 06:57 PM, John Dammeyer wrote: > > >>> I had a brake disk surface ground so it can be laid on the mill > > >>> table and a dial indicator swept around without jamming into the > > >>> T-Slots. For the work I've done to date it's been adequate. It > > >>> fits on my surface plate so I could scrape it even flatter and > > >>> maybe someday it will move up to project #42. > > >> > > >> I have a program that generates a full circular arc, and > > >> then goes to the center of the arc. > > >> So, I can mill a path around the circle, then swap the end > > >> mill for a dial test indicator, and sweep the > > >> circle. So, I can tram the head to the actual X-Y plane of > > >> motion, not just the surface of the table. > > >> And, in fact, due to wear, I get a little bit of a saddle > > >> shape there. But, you can set the tram to > > >> get the best average of the X-X and Y-Y deviations. > > >> > > >> Jon > > > > > > And that, Jon, is the best idea yet. I assume you can adjust the > > > diameter so as to re-use the milled plate again for the next time? > > > > Yes, either change diameter or just cut the ring a little > > deeper each time. > > > > Jon > > So for that, I'd need a plate 5.4719" wide in the y direction. (the > cnc kit costs some range of motion in the Y from the advertised travel > as I've added a bellows cover over the front of the base to keep swarf > off the screw, and the fixed anchor for the bellows stops the table > from coming forward) Thats been a rather inconvenient limit, but it > beats having a huge open hole in the top of the base for swarf to fall > into and directly on the Y screw when its table is moved to the rear. > > I have some 1/2" 7075t6 panel yet from scrapping out a pair of Ampex > VR-1200 2" vtr's. May have holes here and there already, but would be > good for such as this. Or I could get a 6x6x1/2" piece from an online > peddler. That would work but would need to be marked so the holddown > clamps were applied the same way everytime. Twould be sorta stupid to > assume its flat after they sheer off what I ordered. I'll look around > and see whats available. > Whats available is nicely finished, cast of 5053. Can anyone give a URL to a description of that? Machinability etc.
> > -------------------------------------------------------------------- > >-- -------- 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 -- 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
