On Sun, 13 Mar 2016, Chris Morley wrote: > Date: Sun, 13 Mar 2016 20:30:17 +0000 > From: Chris Morley <chrisinnana...@hotmail.com> > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > To: EMC DEV <emc-developers@lists.sourceforge.net> > Subject: [Emc-developers] tandem PID steppers - 1 or 2 PIDs > > Looking to fix up tandem steppers in pncconf. > This is using Mesa stepgens. > > Would it work fine to use one PID loop to control > the two stepgens? > > basically ignore the second stepgens fb. > > Thanks > Chris M
I dont think so, there is nothing to keep one stepgens position from slowly drifting away from the others during acceleration due to slight differences in position read and in velocity write times. These offsets would be small and should cancel out but I dont get the warm fuzzys that long term position drift is impossible with this approach. Also this would prevent the (useful) addition of position offsets between stepgens (like the Gantry comp does) > > ------------------------------------------------------------------------------ > Transform Data into Opportunity. > Accelerate data analysis in your applications with > Intel Data Analytics Acceleration Library. > Click to learn more. > http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
