On Fri, Apr 11, 2014, at 12:11 PM, Jon Elson wrote: > On 04/11/2014 12:41 AM, Gene Heskett wrote:
> > And I haven't checked (I have to think about this stuff & > > then go back & check) as to whether the soft limits move > > with the touchoff or not. > The soft limits are in machine coordinates. They > should be established when you home the machine, > and should not be altered by touchoff, G92 or anthing > else that affects WORK offsets only. > > Now, unless somebody worked on it with this in mind, I > could easily see how you could have a threading cycle that > would exceed a machine limit (I guess that would be +Z) > that might not be detected by the trajectory planner. > The T.P. can't know how long the spindle will coast when > powered off, so it could end up coasting backwards beyond > the machine limit, if the start of the thread was just barely > below the +Z limit. I'm pretty sure that Gene doesn't "touch off" in the way we think of it. If I've followed past conversations correctly, he actually homes the machine using contact between tool and work (or tool and a widget that gives him a reference point). Normally, you'd home the machine once and be done with it, and the limits would be set to protect the machine while allowing you to get your work done. Then use "touch off" and G5x coordinate systems and/or tool offsets to deal with tool and part specifics. Since Gene uses home to deal with tool and part specifics, he has the side effect of limits moving around. -- John Kasunich jmkasun...@fastmail.fm ------------------------------------------------------------------------------ Put Bad Developers to Shame Dominate Development with Jenkins Continuous Integration Continuously Automate Build, Test & Deployment Start a new project now. Try Jenkins in the cloud. http://p.sf.net/sfu/13600_Cloudbees _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
