A servo system like you are using runs torque (amps) up or down depending upon how big the difference between commanded and actual position is. That delta is computed in the EMC but is implemented by the motor drive. The tuning of your motor drive is a critical part of what you want.
The second part of this is related to the EMC. In the EMC and most other motion control systems I've encountered you normally tune PID and Feed forwards to produce the desired motor characteristics including torque. After that tuning is done properly you can adjust commanded position to control motor torque. But that tuning is a static or constant sort of thing. Some systems watch spindle load and will change tools when the load reaches a certain critical point. My thinking is that you'd need to add in some feed override so that you get good cutting, reduce chatter, or meet a machinist's feel for the cut. EMC, through HAL has adaptive feedrate control that could be hooked up to say a summed or weighted average of following error for the relevant axes. Such a system might do what I imagine that you are asking. Rayh On Sun, 2010-04-18 at 02:00 -0600, [email protected] wrote: > Hi > I want to ask about electric current that turns AC servomotor in EMC2. > I think EMC2 works like that: Tool move with lowest electric current. When > tool is encounter resistance from work part etc. EMC2 increase electric > current to overcome that resistance. Increase electric current translates > into increase of torque from AC servomotor. > Can I control that electric current? > How is possible to put overwrite 0% to 100% that electric current? > If I set overwrite to 100% than system behaves as it is. If I set > overwrite to 0% than system does not move. If I set overwrite to 10% than > smallest resistance to tool will stop machine. When resistance reduced > than machine move to execute next bock of code. > > Can it be M code (machine code)? M80 47. (etc) > Means 47% electric current overwrite. > > Thanks > Aram > > > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
