On Tuesday 26 November 2019 09:55:00 andy pugh wrote: > On Tue, 26 Nov 2019 at 13:54, Kenneth Lerman <ler...@se-ltd.com> wrote: > > Use a cylinder square: > > There is no need to start with a perfect cylinder. Instead try to > _make_ a perfect cylinder and correct the other way, by how imperfect > it is.
Which is exactly how I've deduced its off. But I also knew my rigging was off. I need to repeat it with known errors in the rigging. I had a drill chuck screwed to the table, and was lowering the tap hat onto the drill, which looked like it was straight, but was seriously dragging on the side of the hole it had drilled in only an inch of travel. My lathe can probably make a decent starter square as I've measured the bed wear with a laser sighter and corrected that. Make it a thou hollow on the end so it sits square on the table by its OD. Then measure top and bottom with a.0001" dial. Measureing with a square and spacer blocks said it was straighter than a dial ran up and down a 1/2" A2 rod chucked in the chuck by about 15 thou an inch. Attempting to tram it shows its off fwd/aft at least as bad as sideways. But imagine the head trammed, while running up and down a post thats off a degree. The hole moves slant-ways as z moves. At the very least, I need a plumb square tombstone. At this point I've no clue if the bases back face is off, or the front of the post where they mate, or both is off. 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-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
