On Wed, 2009-04-15 at 11:20 -0500, Jon Elson wrote: > Kirk Wallace wrote: > > On Tue, 2009-04-14 at 20:57 -0500, Jon Elson wrote: > > ... snip > > > >> problem, but I made the final fix at the 2007 EMC-Fest, and the driver > >> fixes were in the July 2007 release of EMC2. So, I wanted to see if > >> anyone else was seeing similar problems. Also, I don't see why the > >> spindle sync would care what thread pitch he is cutting! That makes no > >> sense to me at all. > >> > >> Jon > >> > > > > Should I try a test on my machine? If so what would it look like? > > > > > There is a test file, threading.ngc, in the /usr/share/emc/ncfiles > directory. (There may be another version of this file that is MUCH > shorter, about 15 lines. But, I have been working with the longer one > in the /usr/share dir.) Anyway, in the longer one, about halfway down, is > #4=0.05 (thread pitch) > which sets up for 20 TPI. I ran it like that first, then changed the > value to .08333 to get 12 TPI. You can also twiddle with the lead-in, > lead-out scheme and the depth of cut. I left it with a very small > increment (#2=) so I'd get a lot of passes, to see if anything went > wrong. I had no failures here. > > I'd greatly appreciate your trying it there, just to see if there is > some random problem. I cannot understand how the spindle sync would > work prefectly for hundreds of parts at ~20 TPI and fail on roughly 50% > (I think he said that in an earlier message) at 12 TPI. The spindle > sync function has no way of knowing what the thread pitch will be! > > Thanks, > > Jon
Whatever it is, it looks like I have it too. I ran the long version four times with #4=0.050 without any problems. Then before shutting down for the night, I ran one part at #4=0.083333. At the start of the thread the Z would aggressively move then almost come to a stop in the middle of the pass, then surge again and nearly stop at the end of the pass. I let the thread loop go for a five or six more passes. Each pass followed the previous with a slight variation. I know I should do some HALscope captures, but I haven't used HALscope for a while so I need to plan out what I need to do. I am running 6.06 with all of the automatic updates as of today. I can get into more detail later. My lathe configuration is here: http://www.wallacecompany.com/cnc_lathe/HNC/ -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
