On 4/12/2015 5:15 PM, Gene Heskett wrote: > If you have a "position.txt" file set in the ini, nuke it and the file it > generates, and it will then default to 0,0,0 regardless of where it is > physically at, at powerup. This is as opposed to having it at 25,25,25 > when it was exited. With the file specified, it will init itself ack to > where that file tells it it was at shutdown time. Even if the machine > has been moved to the other end of its travel while powered down. This > ambiguity is precisely why you cannot home it once a month. Where should this file be ... I don't have this. I do have a linuxcnc.var (and .bak) and noticed it was changing this file. In the list of numbers/values, 5338 was set to a value that the machine would force itself to whenever Z was homed. So if it said 123, when I homed Z it would tell the system that it's currently at 123. Odd, but I set it to zero and it behaves normally now (whatever that is).
> Then the only consistent knowledge of where it is, will only be known > After its been homed. Oh, I'd never do that. The intention is to home it every time LinuxCNC starts up. > There are times when I prefer one behavior, and times when I prefer the > other. The problem with the position.txt file is that the machine may > have been moved by hand when LCNC isn't running, so you can't swear on > any version of the bible that its memory (from the position.txt file), > is valid. With stepper motors in the mix, its a guaranteed error of up > to 4 counts if microstepping by /8, a very common setting used with > steppers. What's this about? Are you suggesting that with 8-microsteps, it would lose up to 4 counts every powerup? (Which I can understand) or that there's some issue with using 8-microsteps (which I'm currently using)? Cheers, -Neil. ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
