On Monday, February 06, 2012 03:25:49 AM andy pugh did opine: > On 6 February 2012 05:54, gene heskett <ghesk...@wdtv.com> wrote: > > Obviously I have to use G92 to install the Z offset that compensates > > for the drill length, that is unavoidable from my reading. I have no > > lengths in my tool table since I'm using a drill chuck, making those > > lengths arbitrary and requiring I G38.2 to find this out after every > > tool change. > > I don't think that is obvious at all. In fact I think that G92 is the > wrong way to do this, and the tool table is the right way. > > I would suggest that what you should do is use your probed length to > set the tool-offset (G10 L1 or G10 L10, and G43) and use the > hole-finding routine to set the coordinate system origin (G10 L2, or > G10 L20)
I'll look at that in the morning Andy, but I also posted an outline msg a couple hours later that sets up the G54-55-56 methods, and I believe that might be better since I could (theoretically, Murphy lives here & drinks more of my beer than I do) recover the initial motion mapping just by reverting to G54. > The purpose of G92 is mainly to put a duplicate shape somewhere else > on a workpiece, as I understand it. The latest idea won't use it, turns out that G92 axis axis etc is entirely too promiscuous because on about the 30th read I finally understood that it was playing with axis's that weren't named on the line invoking it. It turns out that the G92.1 is only valid as a recovery means if that axis is first driven to exactly the same position it was in when the G92 axis was invoked, otherwise there is a cumulative error that attempts to drive the Z clear off the top of the post on about the 3rd usage in the middle of a 7 tool drill file. 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> Pray to God, but keep rowing to shore. -- Russian Proverb ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
