Anyone? ----- Original Message ----- From: "Andy Ibbotson" <andyi_w...@btinternet.com> To: <emc-users@lists.sourceforge.net> Sent: Sunday, June 07, 2009 11:03 AM Subject: [Emc-users] EMC2.3 and Stepgen tuning
> Hi Everyone, > I've just moved over to EMC2.3.1 after using 2.1.x for sometime - great > piece of code, never had any problems with running my mill. I have a few > questions regarding stepgen tuning under EMC2.3.1, I also changed my CNC > PC to an AMD3400 based system, heres what I did- > 1.Ran the latency test - result max jitter ~15000ns (had to swap NVIDIA > card back to old card as NVIDIA 9600 card gave max jitter of ~50000 to > 60000ns when moving windows around, I'm a complete linux novice so I don't > know how to switch to the nv driver as recommended in the wiki) > 2.Used step conf wizard to configure .ini and .hal files > 3.Looked through .ini and .hal files to check values written. > > I noticed that > .ini file base period was set to 100000ns rather than the wizard recommend > value. > .hal file contained large values for dirhold dirsetup (66000 and 36000, I > guess these still equate to 1 base period if base period is set to > 100000?) > .hal file had values of 1 and 0 set for steplen and stepspace (also > evaluates to 1 base period?) > .hal parport.<pin>.reset-time set to 2500ns (drive requirement is 2500ns > for a minimum pulse width) does reset-time relate to pulse length or is it > steplen - I'm confused. > > In the end I did this: > Max velocity required is 20in/minute on any axis > Max axis scale is 11176 steps/inch > Max jitter ~15000ns > Drive pulse width 2500ns > Drive dirsetup time 5000ns > Drive holdtime 5000ns > > So 11176kHz generates 60ipm so set based period to give headroom on this, > I used 30000ns (16kHzish and 89ipm max velocity). The mill is only an X2 > with ball screws so more than 20ipm is a bit too fast. > > Set dirsetup to 1 in hal file i.e. rounds upto one based period > Set dirhold to 1 in hal file i.e. rounds upto one based period > Set steplen to 1 in hal file i.e. rounds upto one based period > Set stepspace to 1 in hal file i.e. rounds upto one based period > Left the reset-time value of 2500 alone since I dont know what it does! > > All seems well with no joint following errors but can someone confirm my > logic on the choice of parameters please before I let the mill loose on a > job. > Many thanks > Andy > > ------------------------------------------------------------------------------ > OpenSolaris 2009.06 is a cutting edge operating system for enterprises > looking to deploy the next generation of Solaris that includes the latest > innovations from Sun and the OpenSource community. Download a copy and > enjoy capabilities such as Networking, Storage and Virtualization. > Go to: http://p.sf.net/sfu/opensolaris-get > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
