Andrew Ayre wrote: > Hi, I've been happily generating g-code files and cutting them with > AXIS. I'm using EMC2 pre-2.2 CVS HEAD. Yes, I know it's old but I have > everything working and I am reluctant to change it right now as I am > trying to get Christmas gifts made as quickly as possible. > > With a new g-code file I get "Joint 0 Following Error" at the same point > every time in the file. Line 161 I believe. The g-code file is here: > > http://files.britishideas.com/public/emc2/jointerror1.ngc > > On April 17th, 2007 Chris Radek said this about the error message: > > "It means the difference between the commanded position and feedback > position differ by more than the allowed following error." > > I am using a simple, HobbyCNC card with steppers, three axis, no > feedback. I have backlash compensation set in the emc2 ini file. I have > cut lots of g-code files without a problem until now. Can anyone give me > some hints on how to solve this? Is it a problem with the g-code? > A following error in this case means that the commanded velocity required more steps/second than the step generator could produce, with the settings of your system. It may be possible to make the step generator run faster by decreasing the value of BASE_PERIOD in the [EMCMOT] section of your .ini file. Warning! If you make this value too small, your system will freeze up when you start EMC. A quick check would be to set your feed override to 50% and see if the program gets past this spot. I didn't see anything near line 161 that looked like a sudden fast and long move. I do notice some G00 moves at other spots, which would command the fastest motion permitted by the .ini file parameters. That would be where I'd expect to see a following error. A 50% feed override ALSO affects G00 moves, so all motion should slow to 50%, and it should get past the bad spot. If it is really tripping on a G00 move, then you need to lower the MAX velocity in your .ini file (unless speeding up the BASE_PERIOD is possible.)
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