Charles you might find that any M code will cause a slight stoppage of the head as the M codes are not computed like gcodes with constant velocity in mind but rather as a separate command. Also it is not a motion command so there will be no motion when it is executed. If I was you I would look at doing a PWM with PID type controller for the temp control and that you can feed with any kind of value on a hal pin to control the temperature. A component in the background will not interfere with the smooth running of the head.
On 2013-11-21 00:33, Charles Steinkuehler wrote: > Yep, I think that will work! > > Now off to re-work my HAL setup and test it... > > Thanks! > > On 11/20/2013 4:22 PM, sam sokolik wrote: >> I think you want >> http://linuxcnc.org/docs/devel/html/gcode/m-code.html#sec:M67-Analog-Output >> maybe... >> >> sam >> On 11/20/2013 04:16 PM, Charles Steinkuehler wrote: >>> For my 3D printer, I am currently using the existing M1xx convention to >>> do things like set the extruder temperature and set the cooling fan >>> speed. The problem is that this causes a brief pause in coordinated >>> motion as the whole of LinuxCNC comes to a stand-still, my shell-script >>> is executed to set a HAL signal value, and motion resumes again. Each >>> pause winds up turning into a small 'blob' of plastic as the extruder >>> oozes a bit while it remains stuck in one spot. >>> >>> So...is there a way to communicate arbitrary values from gcode to HAL >>> that doesn't cause motion to completely stop (or to stop for a lot less >>> time than it takes to launch a sub-process running a shell script)? >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Shape the Mobile Experience: Free Subscription >>> Software experts and developers: Be at the forefront of tech innovation. >>> Intel(R) Software Adrenaline delivers strategic insight and game-changing >>> conversations that shape the rapidly evolving mobile landscape. Sign up now. >>> http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk >>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> ------------------------------------------------------------------------------ >> Shape the Mobile Experience: Free Subscription >> Software experts and developers: Be at the forefront of tech innovation. >> Intel(R) Software Adrenaline delivers strategic insight and game-changing >> conversations that shape the rapidly evolving mobile landscape. Sign up now. >> http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > > ------------------------------------------------------------------------------ > Shape the Mobile Experience: Free Subscription > Software experts and developers: Be at the forefront of tech innovation. > Intel(R) Software Adrenaline delivers strategic insight and game-changing > conversations that shape the rapidly evolving mobile landscape. Sign up now. > http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Regards /Groete Marius D. Liebenberg +27 82 698 3251 +27 12 743 6064 ------------------------------------------------------------------------------ Shape the Mobile Experience: Free Subscription Software experts and developers: Be at the forefront of tech innovation. Intel(R) Software Adrenaline delivers strategic insight and game-changing conversations that shape the rapidly evolving mobile landscape. Sign up now. http://pubads.g.doubleclick.net/gampad/clk?id=63431311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
