On Friday 02 May 2014 20:33:51 andy pugh did opine: > On 3 May 2014 00:53, Gene Heskett <[email protected]> wrote: > > But in grinding them down, its obvious I wall NOT have a good shoulder > > because the 8mm is just about the bottoms of the ball grooves. > > Rather than grinding, consider trying a CBN insert, and the fastest > spindle speed you can manage. > (Turning with CBN tips is closest to single-point grinding, if the > material isn't red hot and fizzing, you need more spindle speed).
Much of my tooling is indexable carbide inserts, so I'm fairly familiar with red hot swarf, and they do cut better at the higher temps, but that does not sound like CBN. Define? Also, these screws do not have countersinks in the ends, so I can't put it between centers so I can hog it and stay at dimension. Even to use a diamond disk in a dremel, I'll probably have to write a compensatory taper in the grinding code. > > I am inclined to make a sleeve about 12 or 13mm OD, and at least 10mm > > long, and a bit small so I can heat it and hopefully drive it against > > the shoulder, > > Why bother making it so tight? If the aspect ratio is long enough then > it can't help sitting square. True, but I've no clue how hard these screws are, and would like to have it snug enough that it can't move & peen the joint between the sleeve and the screws thread. That would have me chasing backlash that comes & goes. Cheers, Gene -- "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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available. Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
