On Sat, 21 Apr 2012 12:26:58 +0200, you wrote: >Noticed the lists persistent discussion of the LinucCNC trajectory planning >functionality. >As a system designer I'm curious about the mentioned rule "ability to stop at >end of next block" and wonder what the rationale for such a rule consist of. >As a programmer I would also find it convenient to create functionality who >gives the user the possibility to "stop at an arbitrary number of future >blocks", it may consist of 1,2 ,3 or more. > >Some FANUC systems seem to have three blocks lookahead I was recently told. >That gives the user problems if those blocks consists of comments with no >moves I have also been taught...
Hi Roger - The ability to stop at the next block is not a show stopper IMO. BUT - Define STOP ;) Do you want to stop gracefully, so you can resume, or do you just want to stop? If you just want to stop and loose position - press the estop button. Should work every time. There is also a "stop" in axis - I don't know how it behaves though. It may decelerate, or it may just stop? If you want to "feed hold", jog away to clear swarf or replace a broken or worn tool or replace an insert, then resume - forget LinuxCNC for now. There is a token feed hold, doesn't allow you to do anything though other than abandon your program. You're OK with Fanuc on this though with the proviso that it doesn't work mid cycle or during subroutines. On the Fanuc systems I've used a feed hold press is registered and operates immediately after a cycle is completed. Dunno about subs - no commercial shop I've had dealings with used them since tape fed systems became obsolete ;) Steve Blackmore -- ------------------------------------------------------------------------------ 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-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
