On Sunday 20 January 2013 12:36:58 John Prentice (FS) did opine: Message additions Copyright Sunday 20 January 2013 by Gene Heskett
> Gene, greetings > > -----Original Message----- > From: Gene Heskett [mailto:[email protected]] > Sent: 20 January 2013 05:30 > > > Has anyone cut any threads with g76 lately? > > > > I fired off a routine that 4 months back worked great, carving a > > 1/4-28 thread for me several times last fall. Tonight, without any > > changes in the .hal file that would affect threading ops, still set to > > make a > > 1/4-28 SAE thread, and it came out at about 24 tpi. And I haven't a > > clue. My encoder still has 39 slots. Etc, etc. I am on the bleeding > > edge development branch. > > This is a stab in the dark. I have been bitten with coarse pitch threads > caused by the Z ais not being capable of meeting the required rate for > the pitch and spindle RPM. I had an error in VFD scaling and spindle > was running a lot faster than I commanded. > > It is a pita that LCNC does not complain about the "impossible" motion > but just limits on the set Z max-vel. > > John Prentice > No chance John. 39ipm capable z, 28 tpi, 100 rpm, but it will do the same at 750 revs or more, but slid to the left half a thread at 750 revs. In fact, 100 revs is too slow, the tool doesn't cut as clean. 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> An aphorism is never exactly true; it is either a half-truth or one-and-a-half truths. -- Karl Kraus I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_123012 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
