On 4 July 2010 09:15, Ian R Upton <[email protected]> wrote: > In the 'Axis' GUI I select the machine axis and click on home. The axis > commences to move, it then sits there with the motor whisltling and > after some time the motor moves and then stops. I conclude that during > the whistling phase the signals to the motor driver are directing the > motor to work at a speed beyond it's capability.
Yes, it sounds like the stepper is being asked to move far more rapidly than it can manage. > This appears to be borne out by observing the display on the Axis GUI. > > When homing the 'Vel' (velocity) display indicates 6000. Impressive, it it was true. That's 6 metres per minute. > The maximum velocity configured for the axis is 50 mm per second, > maximum acceleration is 20 mm per second. Not related to the problem, but that's a very low acceleration. That means that the axis will take 2.5 seconds to get up to full speed.You probably want 500 for the acceleration number. > Any suggestions on how to control the 'home search velocity'??? A quick experiment shows that in my system HOME_SEARCH_VEL does control the axis homing speed. I got a bit confused at first by looking at the wrong [AXIS] stanza in the INI file (forgetting that when my machine is a lathe the big left to right axis is Z, [AXIS_2] not X [AXIS_0] like it is when it is being a mill.) Incidentally, the Velocity readout in Axis is the speed along the path, it can be a lot higher than the max speed of any one axis if several are moving at the same time. If HOME_SEARCH_VEL in the correct [AXIS_N] stanza is spelled correctly then it really should control the homing speed. And 50mm/sec is 3000m/min and not 6000. It is also fairly high for a stepper system. Try 10 as an experiment? -- atp ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
