On Saturday 12 September 2015 11:39:45 Tom Easterday wrote: > On Sep 12, 2015, at 10:51 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > > I see that video, very impressive. But what sort of a threading > > tool can be driven at that high a side angle? None of the inserts I > > have, have that sort of high angle side clearances. > > It is one of these, reversed in the turret (turning M3) with a 16ER > A60 insert: http://www.shars.com/catalogsearch/result/?q=404-1979 > -Tom
I believe I have one of those, was the external tool of a combo kit I got from across the small pond a couple years ago. It came with 3 inserts per tool, so I don't have a clue if its the same one you quoted. What threads I have carved with this kit have been good ones and I have not damaged or worn out a tooth on the first inserts of either yet. Works very well in alu for internal threads, but the external tool wants to chatter at about 200 Hz when doing mild steel. The chip is tilted forward a good 10 degrees, so I am not convinced the dead level contact position is the correct one. Experiments at raising and lowering it a few thou have not been "fruitfull". I am also unconvinced I have the spindle bearing preload set correctly since that all has to be removed and re-installed in swapping the plastic gears out for the metal ones. I have tightened that nut perhaps 20 degrees without affecting the chatter which does not seem to be related to the tool in the holder, only that its cutting. The sleeve that transmits that pressure to the bearing from the nut is some sort of hard plastic, and draggy as can be on the shaft, which it should NOT be if the idea is to force the bearing race over a thousandth or 7. Strangely, this chatter cannot be felt in the tail end of the 5/8" workpiece presently hanging a foot out of the left side of the headstock. I'll investigate after I'm done with the mills spindle locking pin, and have made a coupling sleeve tapped 8mm all the way thru so as to make an extension for the gearshift that sticks up high enough its position can be checked. I must have started the spindle motor at leasty 10,000 times, in neutral after centering the work in the chuck with a dial indicator. That sleeve will let me use the shift handle from the old head as an extension, making it long enough to see. Thanks Tom E. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
