Anders Wallin wrote: > > So, I think the damage to the threads is because > >>I'm giving the drill-tap too much axial freedom in a home-made >>spring-loaded tap driver. > > > We clamped the tap in a standard ER25 collet, no axial freedom (it's > called _rigid_ tapping after all...). > We had the g33.1 move start with the tip of the tap around 5mm above the > hole so the spindle and Z would have time to accelerate to cruise speed > before hitting the hole. > Our threads appear OK, perhaps somewhat loose, but that may be because > the drill makes a slightly oversize hole. I'm comparing this to using my Procunier "CNC" tapping head on the Bridgeport. It has a very small amount of axial freedom which selects which clutch to engage.
I guess I will have to try it without the springs and see if that looks better. I thought these springs were stiff enough to constrain a 4-40 tap in aluminum. My concern was that this sloppy, home-made machine retrofit would have too much mechanical backlash in the Z travel, and would be putting a lot of axial loads on the tap, especially after it reverses. Thanks, Jon ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
