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
