On 03/13/2012 09:53 PM, Shabbir Hussain wrote: > I have set up a lathe machine with analog AC servos and Mesa 7i43 and 7i33. > The following error is 0.017 mm at start (acceleration) and then reduced to > 0.008 mm at 6000 mm/min. Everything is just fine except: > > When the machine is homed the axis moves towards home switch, touches it and > then moves away with latch velocity. As the index pulse is encoutered the > axis stops with a "DHUCKK" sound. The sound only comes in homing when the > axis are away from home switch ( say 150 mm). The machine runs fine rest of > the moves. I can jog it at 7200 mm/min, stop it then move it in reverse > direction without any sound. The setting for HOME_SEARCH_VEL is 20 mm/sec and > HOME_LATCH_VEL is set at -1.0 mm/sec. The hal scope trace of the f-error > signal shows an error of 0.06 mm and pid output saturated for very small time. > > I am using 2.4.7 on ubuntu 10.04. > > Kindly advise?
We used to call this "the index homing THUMP problem" ;-) Chris Radek fixed it back in 2009; the fix is in 2.4.7 but you need to enable it in hal. The pid component has a pin named "index-enable", you should hook it to the encoder's index-enable pin to get rid of the thump. See the pid(9) manpage for more details. -- Sebastian Kuzminsky ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
