On Sat, 2012-04-07 at 01:07 -0500, Stuart Stevenson wrote: > Gentlemen, > The original difference between M2 and M30 was as follows: > M2 was a program stop > M30 was a program stop with a rewind. > For the individuals who never had the pleasure of running a 'tape' > machine a little explanation is in order. > A paper/Mylar tape reader would read the tape every time a part was > machined. The decision was made to leave the ends of the tape alone or > to connect the ends of the tape and create an endless tape. If you > left the paper tape ends unconnected you would then need to rewind the > tape to the front of the tape (program start position), hence an M30 > would be needed to tell the tape reader to run in reverse until it > found the code indicating the program start position. > When the paper tape ends were connected an M2 was used as a rewind > was not needed.
Are you sure? I recall using M30 to get the workpiece pallet to come out at the end of a run, so the part could be removed. http://www.youtube.com/watch?v=fiABdNc-Nqo -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
