On Feb 3 2013 1:02 PM, Chris Morley wrote: >> >> > I don't know if the trajectory planner keeps the move history, if >> it >> > does then it might be possible to allow negative adaptive feed. >> >> Unfortunately negative feed would require major rework - there is no >> history of the path that has been executed. (That has also been >> discussed at length in the context of EDM.) >> >> >> -- >> John Kasunich >> jmkasun...@fastmail.fm >> > > Michael did a proof of concept on jog-while-paused once. > You can see it on Utube. > > I think it worked by making a second queue for the jogging part. > Then when you were done it picked up the original queue's move. > > I wonder if that same basic concept could be put to use with > backing up an EDM move.
possibly, but a more principled hack would be to interface it at the point where it calls the low lever Catmull-Rom spline, and just evaluate it in reverse. I do not know how difficult that would be, but it would require the ability to move in the negitive direction. I have written things like this for moving along splines with custom code, but I would have to look into how to do this in EMC-s low level motion planning. Probably the easiest thing to do would be to set up a "reverse-motion" pin in HAL, and then evaluate it internally, or modify the adaptive move command to allow positive/negitive feedback voltage which would imply forward/reverse of motion. Anyway that is my thought off the cuff. EBo -- ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_jan _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
