2012/5/30 andy pugh <bodge...@gmail.com>: > On 30 May 2012 10:50, Viesturs Lācis <viesturs.la...@gmail.com> wrote: >> 2012/5/30 andy pugh <bodge...@gmail.com>: > >>> I think that one would have to do more than simply interrupt the >>> steps, as that would cause the motor to slip > >> And why would it do so? > > Because the motor is spinning and the gantry is moving, and the system > can't stop instantaneously within one step increment.
You are right, if the interrupt is done during move. Then yes - it is not good thing to do. Not only will it stop in unknown position, but the deceleration would be very high - it would cause additional stress to machine construction. I am sure that it would work, if it is done the way I suggest: 1) home gantry with slave connected to a home switch on slave end; 2) when it is stopped; "disconnect" slave step signal and change X home switch to one on master end of gantry; 3) rehome X, this time slave will stand still and gantry will be squared out; 4) when it is stopped, connect the slave joint back. All it needs is 2 instances of mux2bit component - one for interrupting step signals, the other for swapping home switches. Sel pins for both instances can be driven with one pyvcp button. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
