Quoting Jon Elson: But, in velocity mode, will it keep up with the encoder counts up to the max velocity? That might be what I should be using, then. I will try it!
But, finally, when in position mode, why should the jog override slider affect how the MPG controls the machine? The dial sends not only position but velocity information, so the jog override slider is redundant for MPG moves. Any thoughts? Jon (end quote) The current mode may be a "done deal" and I have no horse in this race as yet. (Just lots of iron siiting in wait.) I have not had the time to dig under the hood to fully understand the guts of EMC2, maybe once my employer completes its move to Mexico and I am unemployeed I will have the time to explore more. Back in to 80's MPG's were a problem. As mentioned Anlam had issues, so did Yaznaq - each chose a different way of dealing with the issue. Anlam let the machine wind up and would continue movement after the dial stopped. Even in the early 90's some Mazak's would over shoot (keep moving) after jog buttons were released. (the dial seems to track better) Some older Yaznaq's would use the MPG in exact postion mode and if you moved the dial too fast the machine alarmed and deceled at best speed to a stop. A reset was required to gain use of the MPG wheel again. Hurco addressed this in a rather unique way. The Feed override was a potentiometer - no detents as was the MPG - no detents. The override used an analog output to "Scale" the MPG output. With the overide all the way to min - it required about a 1/4 turn to move .0001". The operator had to watch the display postion to know where he was. My personnal opinion (which is only important to me) is that if you are using position mode the jog overide should not apply to MPG input. Max-vel and max-accel values must apply and if you exceed either an F-error alarm should occur and the axis should halt at the max-accel rate. EMC would still know how many steps/pos-vel it had actually output both prior to the alarm and during the decel so the screen position should be currect. Maybe I'm just blowing smoke. (trying to avoid it actually) But any case which allows windup scares me. Greg. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
