On Sat, Sep 4, 2010 at 11:16 AM, Viesturs Lācis <viesturs.la...@gmail.com>wrote:
> Ok, now I got it, but I am convinced that it would not work in joint > mode anyway. Please correct me, if I am wrong. Each joint is > completely independent in joint mode, AFAIK EMC is built so that > assignements between joints and axes are ignored in joint mode, so > also Your suggestion with use of U axis would not work, because, as > You said, in homing U is homed separately, so it is treated as > separate joint in joint mode. > > I believe you are correct to say in joint mode each joint is driven independently by EMC2. The kinematics blending does not apply. Correction please if I am incorrect on this. BUT BUT if the driving signal for the U axis drive comes from the X encoder then the joint mode out of EMC2 (motion or interpreter?) would have no effect on the motion of the U axis. You would have no provision for the U axis in your kinematics therefore when the kinematics is not effective the U axis would not be disabled. The U axis is configured to follow the X axis at all times and in all modes. > There would be an option to modify the LPT cable so that X step and X > dir signals go to 2 pins and so that 2 drives receive those signals. > But this option automatically excludes the possibility of homing each > gantry side separately. > But I need separate control of each gantry side so that machine is > squared and kept straight each time. > > Viesturs > > 2010/9/4 Stuart Stevenson <stus...@gmail.com>: > > homing has nothing to do with the switching - it was just part of the > > explanation of what I would do > > I would not set up the kinematics to drive the second X axis motor. I > would > > set it up to follow the first X axis motor. Then the movement mode would > > make no difference. > > > > On Sat, Sep 4, 2010 at 10:04 AM, Viesturs Lācis < > viesturs.la...@gmail.com>wrote: > > > >> > > >> > hope this helps > >> > thanks > >> > Stuart > >> > > >> > >> No offence, but it didn't :)) > >> I have joint0 and joint1 explicitly assigned to X axis in my kinematics > >> module. > >> In joint mode each joint (motor) is moved independently, no > >> assignements to any axis are in effect in joint mode. That is why it > >> is called "joint mode". > >> > >> I think that my current homing works very well and please accept my > >> apologies, but I do not understand, what does homing have to do with > >> EMC switching to joint mode on its own. > >> > >> Viesturs > >> > >> > >> > ------------------------------------------------------------------------------ > >> This SF.net Dev2Dev email is sponsored by: > >> > >> Show off your parallel programming skills. > >> Enter the Intel(R) Threading Challenge 2010. > >> http://p.sf.net/sfu/intel-thread-sfd > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > > > > > > > -- > > dos centavos > > > ------------------------------------------------------------------------------ > > This SF.net Dev2Dev email is sponsored by: > > > > Show off your parallel programming skills. > > Enter the Intel(R) Threading Challenge 2010. > > http://p.sf.net/sfu/intel-thread-sfd > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------------------------------------------------------ > This SF.net Dev2Dev email is sponsored by: > > Show off your parallel programming skills. > Enter the Intel(R) Threading Challenge 2010. > http://p.sf.net/sfu/intel-thread-sfd > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
