2012/7/13 Hugh Wylie <[email protected]>: > > Having deleted MIN_VELOCITY parms and correcting the A-joint type to LINEAR, > the time lag (having resulted from very different velocity vector commands > to the 5i23) is eliminated.
Glad to hear that. Could You, please, explain a little more about the relation between racking and motor PSU? I am offered to retrofit a double-spindle wood milling machine to LinuxCNC. The main problem currently is that one joint loses its position over time, so parts get ruined. The solution they are using is rehoming machine every 20-30 minutes. There are 4 stepper joints and only one of them is losing position. Client says that there is no regularity for the amount of lost position - sometimes they notice it on the parts very quickly, other times parts are good for longer time (note that some low number of lost steps is not that noticeable, so the quality is acceptable). I was trying to come up with all the possible causes for the situation: 1) currently corresponding joints on both sides are hardwired together - each step and dir line is connected to 2 drives in parallel, so each drive gets only half of signal strength; I was thinking that this might make those lines more sensitive to any noises; 2) the power lines to motor that is losing position runs close to power lines of spindle motor; I was thinking that some noise could be induced in power line, but power for another motor goes there as well, but that motor is not losing position; What else could that be? -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
