When we ran my friends CNC machine on the live CD and the motors ran smoothly. A dial indicator showed we returned to zero.
The dmesg file says the elapsed clocks went from 1,482,000 to 2,594,000. How many usec is that at 1.6 Ghz? A million clock cycles seems like a lot, but if each clock cycle is 1/1.6 GHz it's only 625 uS. At 12:58 PM -0600 11-16-09, Jon Elson wrote: >The backplot couldn't care when the tool gets here or there. The motor >drives and the >workpiece may care very much. If the step motors are humming along at >1000 steps >a second, and suddenly the CPU gets grabbed for 50 ms to check the >battery status, >then the motors cannot stop instantly, so they lose position, and you >have no notice >that has happened, except that the machine made a "klunk". > >Without knowing the exact NUMBERS reported in the dmesg file, you don't >know whether >this was a microsecond-scale pause (not a total killer) or a tens of >millisecond pause (definitely >no good for motion control). > >Jon >Bryan Mumford wrote: >> I have a Dell Inspiron 8600 laptop. It has no parallel port. I can >> get another 8600 with a parallel port from eBay. >> >> My Dell gives the RTAPI error "Unexpected realtime delay on task 1" >> when EMC2 opens. >> >> But it runs EMC programs in the backplot with no errors. There's no >> output because I have no parallel port. >> >> I took the EMC2 live CD to a friend who has a CNC machine and a Dell >> Latitude x300. We booted the CD and EMC2 gives the same RTAPI error >> when it opens. But it runs his CNC mill with no obvious problems. >> >> I had thought the RTAPI error "Unexpected realtime delay on task 1" >> was a deal breaker. But it seems to be insignificant. >> > > Does anyone have more details on this error or what it may mean? ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
