Am 22.01.2007 um 21:06 schrieb Marc Bodmer: > @ Hansjakob > Thank you for the summary of your experiences. The whole homing thing > seems to be easier with linear encoders, especially absolute ones. > There one could just adjust the offset and then slave the second axis > to the position of the master axis plus the offset. > The ones you describe seem to be relative ones with index pulse. This sounds like i can remember. > This > probably makes it easier to adjust the gap between the two axis. > But the base problem seems to be the same. Mines are relative > resolvers > without index pulse. > > Somehow I imagine the homing sequence like that: The master axis does > it's homing sequence, slaved by the second axis of course. When the > home position is found the homing sequence of the second axis starts, > again both axis moving together. When the second home position is > found > the offset can be calculated and corrected. From this point both axis > are syncronized.
As i can remember, the second axis was always follow the master axis, this means also, the homing window has to be quite precise for both axis to avoid moving the axis in opposite directions. We pre-adjusted the axis by manually turning the servos (emergency exit, no power on servos, brakes released) and watching the homing-LED's and adjust both to for example precise "on" the gantry need then to have no tension, otherwise you will have problems with the homing and servos. With this pre-adjusted state, the homing process was no problem. Hansjakob > > Thats how I imagine it, but I have no clue how to do it in EMC. I read > an IRC conversation from 2004 about this topic, but no idea what the > developers finally decided to do. > > Thanks for your answer. > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
