On Mon, Apr 23, 2007 at 11:06:07AM -0500, Jon Elson wrote: > > I saw the 1/3rd scale Ferrari by Pierre Scerri of France, and he > ran it, producing a huge cloud of blue smoke. Lots of other > incredible artistry, too.
Sounds like a neat show - I would have liked to see his model. > After that, re-running the program would sometimes cause it to > blast ahead instead of syncing to the spindle. (Another thing > which I am almost 100% confident is true, is that the spindle > sync'ing either ran perfectly for one complete run of the > program, or that it failed consistently for every threading pass > on that program run. A timing issue in the encoder logic would > not know one program run from another.) Anyway, this could be > caused by the encoder counter failing to zero at the index > pulse, while the driver sensed that the index pulse has been > seen. (Please don't remind me that this may be related to other > problems in the area of homing with index that I am still > investigating, I am WELL aware these are almost entirely the > same function.) Sadly I haven't tried it lately as my lathe is apart. However as it seems you are WELL aware :-) it heavily relies on correct index behavior. If you can collect some more data with halscope, we can dig deeper. In case you did not know, the sim/lathe sample config has a simulated spindle with index - you can run the threading program in it. Reproducing any bad behavior there will ensure that it's not your stuff. Chris ------------------------------------------------------------------------- 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
