I think you missed my point. I figure, the assignment for MAX_ACCELERATION value in the traj section would be dependant upon what values one has specified in the indivdual axis section. That is if you have a 3 axis machine (mill) and have assigned 2.0 for MAX_ACCELERATION values for each axis in the axis sections, then why would one assign 20 for MAX_ACCELERATION in the traj section when the greatest possible coordinated move acceleration is 4.0 due to indivdual axis limitations? Note in the manual in paragraph 5.3.6 states "The [TRAJ] section contains general parameters for the trajectory planning module in EMCMOT. You will not have to change these if you are applying EMC to a common three axis mill in the US."
Jack Ensor John Kasunich wrote: >Jack Ensor wrote: > > >>The suggested value in the ini file Traj section for a 3 axis mill for >>MAX_ACCELERATION seems excessively high. The way I figure it for a >>coordinated move, the maximum would be 2 times the individual axis rate >>(assuming that all axis are assigned equal values). In my particular >>case with a maximum value of 2.0 for each axis, a value of 4.0 should >>be satisfactory for the Traj section. Any comments on this? >> >> > >The accel numbers will depend on the machine - the suggested values are >just that, suggestions. You need to decide what is right for you. > >If your maximum velocity is 2.0 (2 inches per second, assuming an inch >machine), and your accel is 4.0, then it will take one-half second to >go from stopped to max speed. For some machines that might be exactly >what you want. Other machines can go from zero to max speed in a tenth >of a second or less. And some very massive machines may want to do it >even slower. > >Regards, > >John Kasunich > >------------------------------------------------------------------------- >This SF.net email is sponsored by DB2 Express >Download DB2 Express C - the FREE version of DB2 express and take >control of your XML. No limits. Just data. Click to get it now. >http://sourceforge.net/powerbar/db2/ >_______________________________________________ >Emc-users mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/emc-users > >. > > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
