Lars, Take a look at the THC comp to see how I hijacked the position commanded for Z and lied about the position feedback.
John On 1/18/2012 2:53 PM, Ben Jackson wrote: > On Wed, Jan 18, 2012 at 09:41:12PM +0100, Lars Andersson wrote: >> I try manually while running: >> >> setp stepgen.3.position-scale 210 (it was was 200 before) >> >> This immediately gives a "joint 3 following error" even for a very small >> change. > That's because the absolute position of A just moved by a lot. Let's > say you've extruded for 1000 A units. The motor is at 1000*200. When > you change the scale it suddenly wants to be at 1000*210. If you didn't > get the following error you would have instead gotten 10000 stepper units > of extrusion instantly to "catch up". > >> Can I work around this? > You could put a gasket between the axis and stepgen to cancel out the > error. I'm not sure how tricky that would be in practice. > ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! 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-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
