That will work if you always have tubes that are longer than 3000mm. If you need to cut shorter that half the distance then only one motor will move and then the scale will be broken. This is way I thought that some hand-off might be the answer. Or am I not seeing the whole picture with the two steppers moving together but always in opposite directions?
Would this mean that the zero position will have both motors sitting in the middle? ------ Original Message ------ From: "John Kasunich" <jmkasun...@fastmail.fm> To: emc-users@lists.sourceforge.net Sent: 2015-11-17 20:04:56 Subject: Re: [Emc-users] Split X axis - How to go about that? >Instead of a hand-off you could run both axes all the time. If you >command a 100mm move, >the main axis would move 50mm and the auxiliary axis would also move >50mm. > >To do that with steppers you could simply send the same step pulses to >both motors (if they >have the same steps-per-mm). Then tell LinuxCNC that the steps-per-mm >is half of the >value for each motor. > >Homing might be a challenge. You would like the home switch for each >axis to cut off >the step pulses for that axis, and not tell LinuxCNC that the switch >has been hit until >the machine actually hits both switches. HAL can do that if you are >doing software >stepping. > > > >On Tue, Nov 17, 2015, at 12:51 PM, Marius Liebenberg wrote: >> That will work for servos but in my case I am using steppers. Not >>sure >> if the problem is the same. I want the axis to be spit in two and the >> controller must know when to use what stepper to get all the way from >>0 >> to 6000mm. Somewhere in the middle there must be some sort of >>handover >> between the two steppers. >> >> >> : >> > >> >> has anyone attempted this kind of silly >> >> arrangement? >> > >> >> >https://forum.linuxcnc.org/forum/46-francais/28479-cinematique-avec-axes-redondants-presentation?limitstart=0#52533 >> > >> > >> >-- >> >atp >> >If you can't fix it, you don't own it. >> >http://www.ifixit.com/Manifesto >> >>------------------------------------------------------------------------------ >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > >-- > John Kasunich > jmkasun...@fastmail.fm > >------------------------------------------------------------------------------ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
