I have some more thoughts on how (where) to do this. The code to skip is in emctaskmain.cc. It tests to see if the current line is less than the "programStartLine". If so, it just checks limits and continues.It also sets the machines sense of the current position. I believe that this code should set a flag saying that we have been skipping. It should detect if we had been skipping and are no longer skipping. In that case, it should update the physical state of the machine to match the internal state.
That would include a move to the endpoint coordinates, the spindle speed and direction, the current tool, the state of coolant on/off, and anything else that it knows about. I don't think that this is something that can be done with just a simulator, so I'm not going to put it on my list. Besides, I don't really know what I'm doing in this area and mistakes can break things badly. Ken Kenneth Lerman Mark Kenny Products Company, LLC 55 Main Street Newtown, CT 06470 888-ISO-SEVO 203-426-7166 ----- Original Message ----- From: "Kenneth Lerman" <[EMAIL PROTECTED]> To: "EMC developers" <emc-developers@lists.sourceforge.net> Sent: Saturday, May 03, 2008 2:06 PM Subject: Re: [Emc-developers] [Emc-commit] joints_axes emc2 TODO, 1.27,1.27.8.1 >I just started to take a look at the code and have concluded that there is > evil lurking there. > > Right now, the code zips through the interpreter keeping track of the > position, the modes, etc. Consider what happens with things like a change > of > direction. We are going clockwise and want to go counter clockwise. So we > stop the clockwise motion. Then we pause (G1 P5) for five seconds so the > motion has time to stop. Then we start the counter clockwise motion. > > If we are not actually executing the code, the pause won't take effect. I > think that mean that we do NOT want to start the motion at the point in > the > code where the command occurs > > ---------- > > In my brief (ten minute) scan of the code, I thought I saw that all of the > modal stuff is actually saved. So, the change should be that when we get > to > the spot in the code where we want to execute again, we should restore all > of the hardware related modal stuff. I think that means we restore the > proper tool, we set the proper gear and set the proper speed, we turn on > motion in the proper direction, we turn the coolant on or off. And all of > the other things like that. > > Notice that I included changing gears. I don't know how people with > machines > requiring a change of gears are doing that, but if this is to work for > them, > they need to handle it with m-codes and "S" values that are timing > independent at the interpreter level. > > [Whoops. I just contradicted my initial section of this note. Anyone who > uses a pause to safely change spindle direction is doing it the wrong way. > The underlying system integration should do things like disallowing motion > until the spindle is up to speed, and preventing damage from changes of > spindle direction without a pause.] > > Ken > > > > Kenneth Lerman > Mark Kenny Products Company, LLC > 55 Main Street > Newtown, CT 06470 > 888-ISO-SEVO > 203-426-7166 > ----- Original Message ----- > From: "Jon Elson" <[EMAIL PROTECTED]> > To: <emc-developers@lists.sourceforge.net> > Sent: Saturday, May 03, 2008 1:01 PM > Subject: Re: [Emc-developers] [Emc-commit] joints_axes emc2 TODO, > 1.27,1.27.8.1 > > >> Alex Joni wrote: >>> Modified file emc2/TODO >>> + >>> THINGS THAT ARE DESIRABLE FOR THE NEXT MAJOR RELEASE (EMC-2.3) >>> >>> TODO sort out axis/joints issues: >> Any comments on the problem with not starting the spindle when >> you start from the middle of a program? I consider this to be a >> pretty glaring bug, but don't have any idea how hard it would be >> to fix. Obviously many other modal settings are being handled >> as the program is scanned. Is this too ambitious to put in the >> to-do list? >> >> Jon >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> Don't miss this year's exciting event. There's still time to save $100. >> Use priority code J8TL2D2. >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> _______________________________________________ >> Emc-developers mailing list >> Emc-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-developers >> > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
