On Monday 07 December 2020 12:16:35 Jon Elson wrote: > On 12/07/2020 05:11 AM, Gene Heskett wrote: > > Just one problem. I've not measured it, but I believe the backlash > > move may be done the instant motion issues the reversal, so it takes > > place during the spindle slowdown as its still spinning fwd. This > > results in the resultant thread being cut sloppy as that move is > > about 2 thousandths of an inch. And its really obviously almost > > stripped for a fine thread. > > > > Now comes the improvement request for two more pins into motion. > > > > I need a pin to disable the backlash move, until the spindle has > > actually stopped. > > Well, just another reason backlash compensation really "just > doesn't work". Not that the code is bad, the whole concept > is just WRONG! The ONLY place it mostly works is in X-Y > drilling operation, where the machine table has tons of > friction. In ANY operation where coordinated axis motion > happens, then the backlash compensation makes things worse. > > Tighten up the machine as much as you can, and then maybe > put a springy tap holder in the spindle to compensate for > the backlash. > > Jon > Tighten up, will probably have to start with improving the posts tram. Taint vertical by at least a degree.
But who makes a suitable tap holder that isn't specific to just one size of tap? I've likely 40 different sizes of tap shanks taps in that tray of 75+ taps in tap hats already. I am not about to buy a tap holder for every tap in the tray. A quick search has a price starting at $25/copy, up to about $350/copy. And a/o about 13:30 local, I am alone again. My Dee has passed. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
