On Wed, 28 Sep 2011, Chris Morley wrote: > Date: Wed, 28 Sep 2011 04:24:40 +0000 > From: Chris Morley <[email protected]> > Reply-To: EMC developers <[email protected]> > To: EMC DEV <[email protected]> > Subject: [Emc-developers] hostmot2 stepgen bug > > >> From memory: > This bug was reported in 2009 sometime > ( look in mail list under :hostmot2 stepping folowing error oddity) > and again two more times. > The first time removing the base thread seemed to work - thats when I > removed base thread from PNCconf. > Later it was a problem again I reported it and never did get a good fix. > The last time Peter suggested setting max vel and max accel > up to that point I set them to 0 as per recommendations. > I tried that and has not been a problem since. > others have reported similar problems (on forum) > I use a 5i20. > The sample hostmot2 stepper config would have the problem. > I'm imagine whatever the bug is was actually the problem right from the > beginning > even if step timing and base thread would affect it. > > Chris M
The problem is its fairly rare, and quite system dependent. I cant duplicate it here even with a base thread, And I dont think Sebastian was ever able to duplicate it. Do you still have the very large dir change setup/ hold numbers? I suspect they are related in pushing the stepgen correction over the edge > > To: [email protected]; [email protected] > From: [email protected] > Subject: Re: [Emc-developers] FW: [Emc-users] bug(s) in 2.4.6 using > Gantrykins? > Date: Tue, 27 Sep 2011 21:29:22 -0600 > > > > This bug is new to me! Do you have a config that demonstrates this behavior? > > ----- Reply message ----- > From: "Chris Morley" <[email protected]> > Date: Tue, Sep 27, 2011 19:43 > Subject: [Emc-developers] FW: [Emc-users] bug(s) in 2.4.6 using Gantrykins? > To: "EMC DEV" <[email protected]> > > > > Sorry I sent this to Seb instead of the list: > From: [email protected] > To: [email protected] > Subject: RE: [Emc-users] bug(s) in 2.4.6 using Gantrykins? > Date: Wed, 28 Sep 2011 01:29:59 +0000 > > > > > > > > > >> >> Try some tweaks to the hm2 stepgen params: >> >> Try setting .maxaccel to 0, this means "accelerate as hard as the >> trajectory planner asks you to". >> >> Try setting .maxvel to 0, this means "go as fast as the timing params >> let you". >> >> >> -- >> Sebastian Kuzminsky > > Actually I wouldn't advise this. In pncconf I abandoned that as it > caused following errors particularly in one direction. > > Peter advised setting limits for max vel and max accel and the problem > went away. > > Chris M > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
